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      <image:caption>Number Density Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Specific Gravity Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Sphere Density Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Volume To Density Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Volume To Mass Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Water Density Interactive Calculator Technical Diagram</image:caption>
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      <image:title>Brinell Hardness Number Interactive Calculator</image:title>
      <image:caption>Brinell Hardness Number Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Thermal Resistance Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Voltage Regulation Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Simple Pendulum Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Frequency Converter Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Uniformly Accelerated Motion Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Gravitational Field Strength Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Applied Force Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Tension Force Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Elastic Potential Energy Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Conservation Of Energy Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Power Work Force Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Simple Machine Inclined Plane Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Simple Machine Screw Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Simple Machine Lever Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Simple Machine Pulley Systems Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Centripetal Acceleration Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Rotational Kinetic Energy Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Conservation Of Angular Momentum Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Rolling Without Slipping Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Critical Angle Total Internal Reflection Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Drainage Design Mannings Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Compressible Flow Mach Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Nozzle Flow Choked Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Jet Force Momentum Interactive Calculator Technical Diagram</image:caption>
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      <image:title>Buoyancy Flotation Metacentric Interactive Calculator</image:title>
      <image:caption>Buoyancy Flotation Metacentric Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Weber Number Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Cavitation Number Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Orifice Discharge Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Brinell Hardness To Hrc Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Alloy Composition Interactive Calculator Technical Diagram</image:caption>
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      <image:title>Steel Grade Selector Interactive Calculator</image:title>
      <image:caption>Steel Grade Selector Interactive Calculator Technical Diagram</image:caption>
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      <image:title>Heat Treatment Austenitizing Interactive Calculator</image:title>
      <image:caption>Heat Treatment Austenitizing Interactive Calculator Technical Diagram</image:caption>
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      <image:title>Quench Rate Critical Cooling Interactive Calculator</image:title>
      <image:caption>Quench Rate Critical Cooling Interactive Calculator Technical Diagram</image:caption>
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      <image:title>Tempering Temperature Hardness Interactive Calculator</image:title>
      <image:caption>Tempering Temperature Hardness Interactive Calculator Technical Diagram</image:caption>
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      <image:title>Hardenability Jominy Interactive Calculator</image:title>
      <image:caption>Hardenability Jominy Interactive Calculator Technical Diagram</image:caption>
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      <image:title>Creep Rupture Interactive Calculator</image:title>
      <image:caption>Creep Rupture Interactive Calculator Technical Diagram</image:caption>
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      <image:title>Fracture Toughness Kic Interactive Calculator</image:title>
      <image:caption>Fracture Toughness Kic Interactive Calculator Technical Diagram</image:caption>
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      <image:title>Ctod Crack Tip Interactive Calculator</image:title>
      <image:caption>Ctod Crack Tip Interactive Calculator Technical Diagram</image:caption>
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      <image:title>Paris Law Crack Growth Interactive Calculator</image:title>
      <image:caption>Paris Law Crack Growth Interactive Calculator Technical Diagram</image:caption>
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      <image:title>Thermal Shock Resistance Interactive Calculator</image:title>
      <image:caption>Thermal Shock Resistance Interactive Calculator Technical Diagram</image:caption>
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      <image:title>Surface Energy Contact Angle Interactive Calculator</image:title>
      <image:caption>Surface Energy Contact Angle Interactive Calculator Technical Diagram</image:caption>
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      <image:title>Hardness Conversion All Scales Interactive Calculator</image:title>
      <image:caption>Hardness Conversion All Scales Interactive Calculator Technical Diagram</image:caption>
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      <image:title>Metal Weight Shapes Interactive Calculator</image:title>
      <image:caption>Metal Weight Shapes Interactive Calculator Technical Diagram</image:caption>
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      <image:title>Alloy Density Composition Interactive Calculator</image:title>
      <image:caption>Alloy Density Composition Interactive Calculator Technical Diagram</image:caption>
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      <image:title>Drag Force Aerodynamic Interactive Calculator</image:title>
      <image:caption>Drag Force Aerodynamic Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Breguet Range Aircraft Interactive Calculator Technical Diagram</image:caption>
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      <image:title>Endurance Flight Time Interactive Calculator</image:title>
      <image:caption>Endurance Flight Time Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Aspect Ratio Wing Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Dynamic Pressure Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Stall Speed Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Glide Ratio Ld Interactive Calculator Technical Diagram</image:caption>
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      <image:title>Rate Of Climb Interactive Calculator</image:title>
      <image:caption>Rate Of Climb Interactive Calculator Technical Diagram</image:caption>
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      <image:title>Turn Radius Banked Interactive Calculator</image:title>
      <image:caption>Turn Radius Banked Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Load Factor Maneuver Interactive Calculator Technical Diagram</image:caption>
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      <image:title>Fuel Flow Rate Sfc Interactive Calculator</image:title>
      <image:caption>Fuel Flow Rate Sfc Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Propeller Efficiency Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Trim Condition Cg Interactive Calculator Technical Diagram</image:caption>
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      <image:caption>Transfer Function To State Space Interactive Calculator Technical Diagram</image:caption>
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      <image:title>Air Cooling Tower Mechanism: How It Works, Parts, Diagram, and Formula Explained</image:title>
      <image:caption>Air Cooling Tower diagram</image:caption>
    </image:image>
  </url>
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    <loc>https://www.firgelliauto.com/blogs/mechanisms/allan-straight-link-valve-gear</loc>
    <lastmod>2026-10-05T00:01:58-07:00</lastmod>
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      <image:title>Allan Straight-link Valve Gear Explained: How It Works, Parts, Diagram and Uses</image:title>
      <image:caption>Allan Straight-link Valve Gear diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/allen-valve-lift-or-toe</loc>
    <lastmod>2026-10-04T21:04:36-07:00</lastmod>
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      <image:title>Allen Valve Lift or Toe: Rocking Cam, Guided Lifter and Interactive Diagram</image:title>
      <image:caption>Allen Valve Lift or Toe diagram</image:caption>
    </image:image>
  </url>
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    <loc>https://www.firgelliauto.com/blogs/mechanisms/disk-engine</loc>
    <lastmod>2026-10-04T21:45:00-07:00</lastmod>
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      <image:caption>Disk Engine diagram</image:caption>
    </image:image>
  </url>
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    <loc>https://www.firgelliauto.com/blogs/mechanisms/anderson-s-gyroscope-governor</loc>
    <lastmod>2026-10-05T00:26:52-07:00</lastmod>
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      <image:title>Anderson&apos;s Gyroscope Governor Explained: How It Works, Parts, Formula and Uses</image:title>
      <image:caption>Anderson&apos;s Gyroscope Governor diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/automobile-boiler</loc>
    <lastmod>2026-10-05T09:32:57-07:00</lastmod>
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      <image:title>Automobile Boiler Mechanism Explained: Parts, Diagram, Pressure Calculator and Steam Car Uses</image:title>
      <image:caption>Automobile Boiler diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/babcock-and-wilcox-water-tube-boiler</loc>
    <lastmod>2026-10-05T09:42:34-07:00</lastmod>
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      <image:title>Babcock and Wilcox Water Tube Boiler Mechanism: How It Works, Parts, Diagram and Uses Explained</image:title>
      <image:caption>Babcock and Wilcox Water Tube Boiler diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/balanced-reducing-valve</loc>
    <lastmod>2026-10-05T09:54:21-07:00</lastmod>
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      <image:title>Balanced Reducing Valve: Diagram and Pressure-Force Calculator</image:title>
      <image:caption>Balanced Reducing Valve diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/balanced-slide-valve</loc>
    <lastmod>2026-10-05T09:58:13-07:00</lastmod>
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      <image:title>Balanced Slide Valve Mechanism: How It Works, Parts, Diagram, and Net Load Calculator</image:title>
      <image:caption>Balanced Slide Valve diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/balanced-throttle-valve</loc>
    <lastmod>2026-10-05T10:02:59-07:00</lastmod>
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      <image:title>Balanced Throttle Valve Mechanism: How It Works, Diagram, Parts, and Uses in Steam Turbines</image:title>
      <image:caption>Balanced Throttle Valve diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/ball-valve-injector</loc>
    <lastmod>2026-10-05T10:17:26-07:00</lastmod>
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      <image:title>Ball-valve Injector Mechanism: How It Works, Parts, Diagram, and Uses in Steam Boilers</image:title>
      <image:caption>Ball-valve Injector diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/bates-compound-vibrating-engine</loc>
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      <image:title>Bates Compound Vibrating Engine: How It Works, Diagram, Parts, Uses &amp; Compound Ratio Calculator</image:title>
      <image:caption>Bates Compound Vibrating Engine diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/berrenburg-rotary-engine</loc>
    <lastmod>2026-10-04T20:28:03-07:00</lastmod>
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      <image:title>Berrenburg Rotary Engine Mechanism: How It Works, Parts, Diagram, and Uses Explained</image:title>
      <image:caption>Berrenburg Rotary Engine diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/boardman-rotary-engine</loc>
    <lastmod>2026-10-04T20:30:10-07:00</lastmod>
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      <image:title>Boardman Rotary Engine: Concentric Rotor and Hinged Pistons</image:title>
      <image:caption>Boardman Rotary Engine diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/boiler-of-the-serpollet-tricycle</loc>
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      <image:caption>Boiler of the Serpollet Tricycle diagram</image:caption>
    </image:image>
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    <loc>https://www.firgelliauto.com/blogs/mechanisms/boyer-s-water-tube-boiler</loc>
    <lastmod>2026-10-04T21:59:40-07:00</lastmod>
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      <image:caption>Boyer&apos;s Water Tube Boiler diagram</image:caption>
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  </url>
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    <lastmod>2026-10-04T22:01:22-07:00</lastmod>
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      <image:title>Bremme Valve Gear Mechanism Explained: Parts, How It Works, Formula, and Marine Steam Engine Uses</image:title>
      <image:caption>Bremme Valve Gear diagram</image:caption>
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    <loc>https://www.firgelliauto.com/blogs/mechanisms/brownley-injector</loc>
    <lastmod>2026-10-04T22:05:31-07:00</lastmod>
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      <image:title>Brownley Injector: Two-stage Animation and Thermal Balance Calculator</image:title>
      <image:caption>Brownley Injector diagram</image:caption>
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    <lastmod>2026-10-04T22:07:52-07:00</lastmod>
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      <image:title>Bundy Steam Trap: Weighted Bowl Mechanism and Batch-Cycle Calculator</image:title>
      <image:caption>Bundy Steam Trap diagram</image:caption>
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    <lastmod>2026-10-04T22:14:46-07:00</lastmod>
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      <image:title>Cam-bar Valve Movement Mechanism: How It Works, Parts, Diagram and Uses in Steam Engines</image:title>
      <image:caption>Cam-bar Valve Movement diagram</image:caption>
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      <image:caption>Cartwright&apos;s Parallel Motion diagram</image:caption>
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      <image:caption>Centrifugal Crank-pin Oiler diagram</image:caption>
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      <image:caption>Centrifugal Exhaust Head diagram</image:caption>
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      <image:caption>Centrifugal Lubricating Device diagram</image:caption>
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      <image:caption>Climax Boiler diagram</image:caption>
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      <image:caption>Cochrane Rotary Engine diagram</image:caption>
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      <image:title>Dawson’s Compensating Governor: Linked Central Weight and Equilibrium Calculator</image:title>
      <image:caption>Compensating Governor diagram</image:caption>
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      <image:caption>Compound Engines diagram</image:caption>
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      <image:caption>Compound Locomotive Cylinders diagram</image:caption>
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      <image:caption>Compound Oscillating Engine diagram</image:caption>
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      <image:caption>Compound Yacht Engine diagram</image:caption>
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      <image:caption>Corliss Valve Gear diagram</image:caption>
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      <image:title>Corrugated Expansion Coupling Mechanism: How Bellows Absorb Steam Pipe Thermal Expansion</image:title>
      <image:caption>Corrugated Expansion Coupling diagram</image:caption>
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      <image:caption>Crank-pin Lubricator diagram</image:caption>
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      <image:caption>Crank-shaft Governor diagram</image:caption>
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      <image:caption>Cross-head Slide diagram</image:caption>
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      <image:caption>De Laval Steam Turbine diagram</image:caption>
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  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/diagonal-twin-screw-engine</loc>
    <lastmod>2026-10-04T21:17:01-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/diagonal-twin-screw-engine.png?v=1777220724</image:loc>
      <image:title>Diagonal Twin-screw Engine Mechanism: How It Works, Parts, Diagram and Marine Uses Explained</image:title>
      <image:caption>Diagonal Twin-screw Engine diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/differential-governor</loc>
    <lastmod>2026-10-04T21:25:09-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/differential-governor.png?v=1777220736</image:loc>
      <image:title>Differential Governor Mechanism: How It Works, Parts, Diagram and Calculator for Steam Engines</image:title>
      <image:caption>Differential Governor diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/differential-seat-safety-valve</loc>
    <lastmod>2026-10-04T21:28:51-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/differential-seat-safety-valve.png?v=1777220749</image:loc>
      <image:title>Differential-Seat Safety Valve: Linked Heads, Pressure Areas and Spring-Force Comparison</image:title>
      <image:caption>Differential Seat Safety Valve diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/dion-vehicle-boiler</loc>
    <lastmod>2026-10-04T21:30:17-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/dion-vehicle-boiler.png?v=1777220761</image:loc>
      <image:title>Dion Vehicle Boiler: Concentric Drums, Water Tubes and Grate-Area Comparison</image:title>
      <image:caption>Dion Vehicle Boiler diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/direct-acting-centrifugal-governor</loc>
    <lastmod>2026-10-04T21:31:08-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/direct-acting-centrifugal-governor.png?v=1777220772</image:loc>
      <image:title>Direct-acting Centrifugal Governor: How It Works, Parts, Formula &amp; Uses Explained</image:title>
      <image:caption>Direct-acting Centrifugal Governor diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/disengaging-device-modification-1</loc>
    <lastmod>2026-10-04T21:40:06-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/disengaging-device-modification-1.png?v=1777220783</image:loc>
      <image:title>Manual Eccentric-Rod Disengaging Device: Brown187 Gab Release</image:title>
      <image:caption>Disengaging Device (modification 1) diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/disengaging-device-modification-2</loc>
    <lastmod>2026-10-04T21:41:30-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/disengaging-device-modification-2.png?v=1777220795</image:loc>
      <image:title>Manual Eccentric-Rod Disengaging Device: Brown188 Gab Release</image:title>
      <image:caption>Disengaging Device (modification 2) diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/disengaging-device-modification-3</loc>
    <lastmod>2026-10-04T21:41:34-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/disengaging-device-modification-3.png?v=1777220811</image:loc>
      <image:title>Disengaging Device (modification 3) Mechanism Explained: Parts, Diagram, and How It Works</image:title>
      <image:caption>Disengaging Device (modification 3) diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/double-slide-piston-rotary-engine</loc>
    <lastmod>2026-10-04T22:08:56-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/double-slide-piston-rotary-engine.png?v=1777220823</image:loc>
      <image:title>Double-Slide Piston Rotary Engine: Radial Slides and Ovoid Chambers</image:title>
      <image:caption>Double Slide Piston Rotary Engine diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/dow-steam-turbine</loc>
    <lastmod>2026-10-04T22:16:29-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/dow-steam-turbine.png?v=1777220837</image:loc>
      <image:title>Dow Steam Turbine Mechanism: How It Works, Parts, Diagram, Formula and Uses Explained</image:title>
      <image:caption>Dow Steam Turbine diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/eccentric-rod-disengaging-device</loc>
    <lastmod>2026-10-04T22:41:58-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/eccentric-rod-disengaging-device.png?v=1777220861</image:loc>
      <image:title>Eccentric-rod Disengaging Device Explained: How It Works, Parts, Diagram &amp; Uses in Steam Valve Gear</image:title>
      <image:caption>Eccentric-rod Disengaging Device diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/eclipse-return-tubular-marine-boiler</loc>
    <lastmod>2026-10-04T22:44:12-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/eclipse-return-tubular-marine-boiler.png?v=1777220875</image:loc>
      <image:title>Eclipse Return Tubular Marine Boiler Mechanism: How It Works, Parts, Diagram &amp; Evaporation Formula</image:title>
      <image:caption>Eclipse Return Tubular Marine Boiler diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/edwards-air-pump</loc>
    <lastmod>2026-10-04T22:45:16-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/edwards-air-pump.png?v=1777220885</image:loc>
      <image:title>Edwards Air Pump Mechanism: How It Works, Parts, Diagram and Sizing Formula for Steam Condensers</image:title>
      <image:caption>Edwards Air Pump diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/ejector-condenser</loc>
    <lastmod>2026-10-04T22:47:26-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/ejector-condenser.png?v=1777220901</image:loc>
      <image:title>Ejector Condenser Mechanism: How It Works, Parts, Diagram, and Uses Explained</image:title>
      <image:caption>Ejector Condenser diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/excelsior-injector</loc>
    <lastmod>2026-10-04T23:30:06-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/excelsior-injector.png?v=1777220913</image:loc>
      <image:title>Excelsior Injector: Steam and Water Pressure Calculator | FIRGELLI</image:title>
      <image:caption>Excelsior Injector diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/exhaust-jet-condenser</loc>
    <lastmod>2026-10-04T23:30:10-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/exhaust-jet-condenser.png?v=1777220927</image:loc>
      <image:title>Exhaust Jet Condenser: Injection-Water Calculator | FIRGELLI</image:title>
      <image:caption>Exhaust Jet Condenser diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/exhaust-steam-head</loc>
    <lastmod>2026-10-04T23:31:54-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/exhaust-steam-head.png?v=1777220938</image:loc>
      <image:title>Exhaust Steam Head: Baffle and Passage-Area Calculator | FIRGELLI</image:title>
      <image:caption>Exhaust Steam Head diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/feed-water-heater</loc>
    <lastmod>2026-10-05T16:29:09-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/feed-water-heater.png?v=1777220958</image:loc>
      <image:title>Feed-Water Heater: Heat and Steam-Ratio Calculator | FIRGELLI</image:title>
      <image:caption>Feed-water Heater diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/feeding-pulverized-fuel</loc>
    <lastmod>2026-10-04T23:53:39-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/feeding-pulverized-fuel.png?v=1777220971</image:loc>
      <image:title>Feeding Pulverized Fuel: Interactive Process Diagram | FIRGELLI</image:title>
      <image:caption>Feeding Pulverized Fuel diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/filter-for-boiler</loc>
    <lastmod>2026-10-06T17:25:21-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/filter-for-boiler.png?v=1777220987</image:loc>
      <image:title>Boiler Feedwater Filter: Upward-Flow Animation and Pressure-Loss Calculator</image:title>
      <image:caption>Filter for Boiler diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/flanged-expansion-joint</loc>
    <lastmod>2026-10-06T17:39:41-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/flanged-expansion-joint.png?v=1777221004</image:loc>
      <image:title>Flanged Expansion Joint: Free Thermal Expansion Calculator | FIRGELLI</image:title>
      <image:caption>Flanged Expansion Joint diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/fletcher-s-rotary-condensing-engine</loc>
    <lastmod>2026-10-06T17:43:36-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/fletcher-s-rotary-condensing-engine.png?v=1777221015</image:loc>
      <image:title>Fletcher’s Condensing Engine: Pressure-Reference Calculator | FIRGELLI</image:title>
      <image:caption>Fletcher&apos;s Rotary Condensing Engine diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/flexible-metallic-hose-and-tubing</loc>
    <lastmod>2026-10-05T13:01:51-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/flexible-metallic-hose-and-tubing.png?v=1777221025</image:loc>
      <image:title>Flexible Metallic Hose: Bore-Area Thrust Comparison | FIRGELLI</image:title>
      <image:caption>Flexible Metallic Hose and Tubing diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/fly-wheel-or-pulley-governor</loc>
    <lastmod>2026-10-05T13:58:31-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/fly-wheel-or-pulley-governor.png?v=1777221039</image:loc>
      <image:title>Fly-wheel or Pulley Governor: Force and Spring Calculator | FIRGELLI</image:title>
      <image:caption>Fly-wheel or Pulley Governor diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/forrester-rotary-engine</loc>
    <lastmod>2026-10-05T13:59:11-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/forrester-rotary-engine.png?v=1777221052</image:loc>
      <image:title>Forrester Rotary Engine: Historical Mechanism and Ideal Torque | FIRGELLI</image:title>
      <image:caption>Forrester Rotary Engine diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/foster-pressure-reducing-valve</loc>
    <lastmod>2026-10-06T10:03:09-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/foster-pressure-reducing-valve-mechanism.png?v=1791306188</image:loc>
      <image:title>Foster Pressure-Reducing Valve: 1888 Diaphragm Design</image:title>
      <image:caption>Foster Pressure-Reducing Valve — schematic of the mechanism.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/franchot-rotary-engine</loc>
    <lastmod>2026-10-05T15:37:19-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/franchot-sliding-wing.png?v=1791239838</image:loc>
      <image:title>Franchot Rotary Engine: Sliding-Wing Mechanism and Animation</image:title>
      <image:caption>Franchot sliding-wing rotary engine: fixed ovoid casing, slotted rotor and one rigid sliding wing.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/furnace-grate-with-dumping-sections</loc>
    <lastmod>2026-10-05T20:59:19-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/furnace-grate-with-dumping-sections.png?v=1777221090</image:loc>
      <image:title>Dumping-section Furnace Grate: Fuel-input Calculator | FIRGELLI</image:title>
      <image:caption>Furnace Grate with Dumping Sections diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/galloway-boiler</loc>
    <lastmod>2026-10-05T21:20:29-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/galloway-boiler-mechanism.png?v=1791260313</image:loc>
      <image:title>Galloway Boiler: Water Tubes and Heat Balance</image:title>
      <image:caption>Galloway Boiler — schematic of the mechanism.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/globe-valve</loc>
    <lastmod>2026-10-05T04:10:30-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/globe-valve.png?v=1777221113</image:loc>
      <image:title>Globe Valve: Liquid Cv Calculator and Flow Path | FIRGELLI</image:title>
      <image:caption>Globe Valve diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/gooch-valve-gear</loc>
    <lastmod>2026-10-06T07:07:29-07:00</lastmod>
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    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/gooch-valve-gear-mechanism.png?v=1791295648</image:loc>
      <image:title>Gooch Valve Gear: Moving Link Animation and Valve-Travel Calculator</image:title>
      <image:caption>Gooch Valve Gear — schematic of the mechanism.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/gridiron-slide-valve</loc>
    <lastmod>2026-10-06T01:30:47-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/gridiron-slide-valve.png?v=1777221135</image:loc>
      <image:title>Gridiron Slide Valve: Port Opening Calculator | FIRGELLI</image:title>
      <image:caption>Gridiron Slide Valve diagram</image:caption>
    </image:image>
  </url>
  <url>
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    <lastmod>2026-10-06T06:57:11-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/hackworth-valve-gear-mechanism.png?v=1791295030</image:loc>
      <image:title>Hackworth Valve Gear: Linked Animation and Valve-Travel Calculator</image:title>
      <image:caption>Hackworth Valve Gear — schematic of the mechanism.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/hancock-inspirator</loc>
    <lastmod>2026-10-06T05:17:55-07:00</lastmod>
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    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/hancock-inspirator-mechanism.png?v=1791289075</image:loc>
      <image:title>Hancock Inspirator: Double-Tube Animation and Pressure Comparison</image:title>
      <image:caption>Hancock Inspirator — schematic of the mechanism.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/hanging-water-drum-cylindrical-boiler</loc>
    <lastmod>2026-10-06T01:59:29-07:00</lastmod>
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    <image:image>
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      <image:title>Hanging Water Drum Boiler: Hiscox’s Connected-Drum Design | FIRGELLI</image:title>
      <image:caption>Hanging Water Drum Cylindrical Boiler diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/harrison-boiler</loc>
    <lastmod>2026-10-06T02:24:22-07:00</lastmod>
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    <image:image>
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      <image:title>Harrison Boiler: Sectional Spheres and Geometry Calculator | FIRGELLI</image:title>
      <image:caption>Harrison Boiler diagram</image:caption>
    </image:image>
  </url>
  <url>
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    <lastmod>2026-10-06T02:53:04-07:00</lastmod>
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      <image:title>Hazelton Boiler: Historical Layout and Heat-Balance Calculator | FIRGELLI</image:title>
      <image:caption>Hazelton Boiler diagram</image:caption>
    </image:image>
  </url>
  <url>
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    <lastmod>2026-10-05T06:04:26-07:00</lastmod>
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      <image:title>Heintz Steam Trap: Thermal Principle and Scaling Exercise | FIRGELLI</image:title>
      <image:caption>Heintz Steam Trap diagram</image:caption>
    </image:image>
  </url>
  <url>
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    <lastmod>2026-10-06T03:00:12-07:00</lastmod>
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    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/herreshoff-boiler.png?v=1777221216</image:loc>
      <image:title>Herreshoff Boiler: Historical Coil and Surface-Area Comparison | FIRGELLI</image:title>
      <image:caption>Herreshoff Boiler diagram</image:caption>
    </image:image>
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  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/high-speed-tandem-compound-engine</loc>
    <lastmod>2026-10-06T07:20:19-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/high-speed-tandem-compound-engine.png?v=1777221227</image:loc>
      <image:title>Tandem Compound Steam Engine: Area and Pressure Ratios | FIRGELLI</image:title>
      <image:caption>High-speed Tandem Compound Engine diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/holly-rotary-engine</loc>
    <lastmod>2026-10-06T09:36:07-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/holly-rotary-engine-mechanism_428cb1bf-30f1-482c-8b44-7e37d2f44f61.png?v=1791304567</image:loc>
      <image:title>Holly Rotary Engine: Paired-Piston Animation and Work Calculator</image:title>
      <image:caption>Holly Rotary Engine — schematic of the mechanism.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/horizontal-swing-check-valve</loc>
    <lastmod>2026-10-05T07:06:48-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/horizontal-swing-check-valve.png?v=1777221260</image:loc>
      <image:title>Horizontal Swing Check Valve: Liquid Cv and Velocity Calculator | FIRGELLI</image:title>
      <image:caption>Horizontal Swing Check Valve diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/horizontal-tubular-boiler</loc>
    <lastmod>2026-10-06T03:11:55-07:00</lastmod>
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      <image:title>Horizontal Tubular Boiler: Surface-Area Scenario Calculator | FIRGELLI</image:title>
      <image:caption>Horizontal Tubular Boiler diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/hotchkiss-boiler-cleaner</loc>
    <lastmod>2026-10-06T03:21:15-07:00</lastmod>
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    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/hotchkiss-boiler-cleaner.png?v=1777221286</image:loc>
      <image:title>Hotchkiss Boiler Cleaner: Settling Globe and Thickness Comparison | FIRGELLI</image:title>
      <image:caption>Hotchkiss Boiler Cleaner diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/huntoon-governor</loc>
    <lastmod>2026-10-05T07:20:03-07:00</lastmod>
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    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/huntoon-governor.png?v=1777221299</image:loc>
      <image:title>Huntoon Liquid-Resistance Governor and Speed Converter | FIRGELLI</image:title>
      <image:caption>Huntoon Governor diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/inclined-paddle-wheel-engine</loc>
    <lastmod>2026-10-06T07:31:59-07:00</lastmod>
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    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/inclined-paddle-wheel-engine.png?v=1777221312</image:loc>
      <image:title>Inclined Paddle-Wheel Engine: Illustrative Geometry Calculator | FIRGELLI</image:title>
      <image:caption>Inclined Paddle-wheel Engine diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/independent-jet-condenser-pump</loc>
    <lastmod>2026-10-05T08:35:30-07:00</lastmod>
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    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/independent-jet-condenser-pump.png?v=1777221325</image:loc>
      <image:title>Independent Jet Condenser Pump: Volume Balance Calculator | FIRGELLI</image:title>
      <image:caption>Independent Jet Condenser Pump diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/internal-fired-cylindrical-tubular-boiler</loc>
    <lastmod>2026-10-05T08:51:45-07:00</lastmod>
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    <image:image>
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      <image:title>Internal-Fired Tubular Boiler: Efficiency Comparison Calculator | FIRGELLI</image:title>
      <image:caption>Internal Fired Cylindrical Tubular Boiler diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/internally-fired-flue-boiler</loc>
    <lastmod>2026-10-06T18:30:26-07:00</lastmod>
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    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/internally-fired-flue-boiler.png?v=1777221350</image:loc>
      <image:title>Internally Fired Flue Boiler: Lancashire Cutaway and Thermal Calculator | FIRGELLI</image:title>
      <image:caption>Internally Fired Flue Boiler diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/inverted-governor</loc>
    <lastmod>2026-10-06T18:38:26-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/inverted-governor.png?v=1777221364</image:loc>
      <image:title>Inverted Governor: Linkage Illustration and Speed-Bound Calculator | FIRGELLI</image:title>
      <image:caption>Inverted Governor diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/joy-s-valve-gear</loc>
    <lastmod>2026-10-06T07:53:40-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/joy-s-valve-gear-mechanism.png?v=1791298419</image:loc>
      <image:title>Joy’s Valve Gear: Connected Animation and Valve-Travel Calculator</image:title>
      <image:caption>Joy’s Valve Gear — schematic of the mechanism.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/joy-s-hydraulic-shifting-eccentric</loc>
    <lastmod>2026-10-06T07:41:01-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/joy-s-hydraulic-shifting-eccentric-mechanism.png?v=1791297660</image:loc>
      <image:title>Joy’s Hydraulic Shifting Eccentric: Animation and Offset Calculator</image:title>
      <image:caption>Joy’s Hydraulic Shifting Eccentric — schematic of the mechanism.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/kipp-rotary-piston-engine</loc>
    <lastmod>2026-10-06T19:06:27-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/kipp-rotary-piston-engine.png?v=1777221409</image:loc>
      <image:title>Kipp Rotary-Piston Engine: Historical Layout and Power Calculator | FIRGELLI</image:title>
      <image:caption>Kipp Rotary Piston Engine diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/knickerbocker-four-piston-rotary-engine</loc>
    <lastmod>2026-10-06T08:20:52-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/knickerbocker-four-piston-rotary-engine-mechanism.png?v=1791300051</image:loc>
      <image:title>Knickerbocker Four-Piston Engine: Animation and Stroke Calculator</image:title>
      <image:caption>Knickerbocker Four-Piston Engine — schematic of the mechanism.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/korting-injector</loc>
    <lastmod>2026-10-06T21:20:10-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/korting-injector.png?v=1777221431</image:loc>
      <image:title>Körting Injector: Two-Stage Flow and Volume-Ratio Comparison | FIRGELLI</image:title>
      <image:caption>Korting Injector diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/leader-injector</loc>
    <lastmod>2026-10-04T19:43:25-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/leader-injector.png?v=1777221452</image:loc>
      <image:title>Leader Injector: Historic Double-Tube Sequence</image:title>
      <image:caption>Leader Injector diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/link-vibratory-engine</loc>
    <lastmod>2026-10-04T23:51:36-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/link-vibratory-engine.png?v=1777221465</image:loc>
      <image:title>Link Vibratory Engine: Hiscox Figure 354 Explained</image:title>
      <image:caption>Link Vibratory Engine diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/little-giant-injector</loc>
    <lastmod>2026-10-04T23:54:06-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/little-giant-injector.png?v=1777221476</image:loc>
      <image:title>Little Giant Locomotive Injector: Hiscox Figure 383 Explained</image:title>
      <image:caption>Little Giant Injector diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/little-giant-locomotive-injector</loc>
    <lastmod>2026-10-04T23:54:10-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/little-giant-locomotive-injector.png?v=1777221488</image:loc>
      <image:title>Little Giant Locomotive Injector: Movable Combining Tube Explained</image:title>
      <image:caption>Little Giant Locomotive Injector diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/locomotive-boiler</loc>
    <lastmod>2026-10-04T23:24:29-07:00</lastmod>
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    <image:image>
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      <image:title>Locomotive Boiler Mechanism: How It Works, Parts, Diagram, and Steam Calculator</image:title>
      <image:caption>Locomotive Boiler diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/locomotive-link-motion-valve-gear</loc>
    <lastmod>2026-10-04T23:57:25-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/locomotive-link-motion-valve-gear.png?v=1777221510</image:loc>
      <image:title>Stephenson Link Motion: Expansion Link and Die Block Explained</image:title>
      <image:caption>Locomotive Link-motion Valve Gear diagram</image:caption>
    </image:image>
  </url>
  <url>
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    <lastmod>2026-10-06T15:44:28-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/marshall-valve-gear.png?v=1777221543</image:loc>
      <image:title>Marshall Valve Gear: Suspension-Link Topology and Eccentric Motion</image:title>
      <image:caption>Marshall Valve Gear diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/metropolitan-injector</loc>
    <lastmod>2026-10-05T00:38:29-07:00</lastmod>
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    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/metropolitan-injector.png?v=1777221573</image:loc>
      <image:title>Metropolitan Injector: Components and Static-Head Comparison</image:title>
      <image:caption>Metropolitan Injector diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/meyer-cut-off-valve</loc>
    <lastmod>2026-10-05T00:42:44-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/meyer-cut-off-valve.png?v=1777221585</image:loc>
      <image:title>Meyer Cut-off Valve: Right-and-Left Screw Adjustment</image:title>
      <image:caption>Meyer Cut-off Valve diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/misch-s-valve-tappet</loc>
    <lastmod>2026-10-05T00:51:31-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/misch-s-valve-tappet.png?v=1777221596</image:loc>
      <image:title>Misch&apos;s Valve Tappet: Historical Component Map and SHM Reference</image:title>
      <image:caption>Misch&apos;s Valve Tappet diagram</image:caption>
    </image:image>
  </url>
  <url>
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    <lastmod>2026-10-05T00:56:53-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/modern-high-speed-engine.png?v=1777221607</image:loc>
      <image:title>Enclosed High-Speed Steam Engine: Slider-Crank Kinematics</image:title>
      <image:caption>Modern High-speed Engine diagram</image:caption>
    </image:image>
  </url>
  <url>
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    <lastmod>2026-10-05T08:23:57-07:00</lastmod>
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    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/moran-s-flexible-steam-joint.png?v=1777221621</image:loc>
      <image:title>Moran Flexible Steam Joint: Articulation Geometry</image:title>
      <image:caption>Moran&apos;s Flexible Steam Joint diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/moyes-water-tube-boiler</loc>
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    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/moyes-water-tube-boiler.png?v=1777221634</image:loc>
      <image:title>Moyes 1898 Water-Tube Boiler: Patent Layout and Tube-Bank Geometry</image:title>
      <image:caption>Moyes Water Tube Boiler diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/multiple-port-piston-throttle-valve</loc>
    <lastmod>2026-10-05T08:44:19-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
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      <image:title>Multiple-Port Piston Throttle Valve: Declared Port-Exposure Geometry</image:title>
      <image:caption>Multiple Port Piston Throttle Valve diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/napuer-rotary-engine</loc>
    <lastmod>2026-10-05T08:59:04-07:00</lastmod>
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    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/napuer-rotary-engine.png?v=1791215944</image:loc>
      <image:title>Napier Rotary Engine: Eccentric Rotor and Sliding Wings</image:title>
      <image:caption>Napier rotary engine diagram</image:caption>
    </image:image>
  </url>
  <url>
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    <lastmod>2026-10-05T09:01:34-07:00</lastmod>
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    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/national-automatic-injector.png?v=1777221674</image:loc>
      <image:title>National Automatic Injector: Four Fixed Tubes and Successive Checks</image:title>
      <image:caption>National Automatic Injector diagram</image:caption>
    </image:image>
  </url>
  <url>
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    <changefreq>weekly</changefreq>
    <image:image>
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      <image:title>Oscillating-cylinder Steam Engine: How It Works, Parts, Diagram, Animation and Real Uses</image:title>
      <image:caption>Oscillating-cylinder Steam Engine diagram</image:caption>
    </image:image>
  </url>
  <url>
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    <lastmod>2026-10-05T09:40:01-07:00</lastmod>
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    <image:image>
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      <image:title>Oscillating-Cylinder Steam Engine: Port-Face Motion</image:title>
      <image:caption>Oscillating Marine Engine Valve Motion diagram</image:caption>
    </image:image>
  </url>
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    <lastmod>2026-10-05T10:05:29-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/park-injector.png?v=1777221709</image:loc>
      <image:title>Park Injector: Hiscox Double-Tube Control Sequence</image:title>
      <image:caption>Park Injector diagram</image:caption>
    </image:image>
  </url>
  <url>
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    <lastmod>2026-10-05T10:07:00-07:00</lastmod>
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    <image:image>
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      <image:title>Parsons Steam Turbine: Alternating Reaction-Stage Layout</image:title>
      <image:caption>Parsons&apos; Steam Turbine diagram</image:caption>
    </image:image>
  </url>
  <url>
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    <lastmod>2026-10-05T10:12:46-07:00</lastmod>
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    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/peaucellier-s-parallel-motion.png?v=1777221734</image:loc>
      <image:title>Peaucellier Parallel Motion: Exact Inversion Straight Line</image:title>
      <image:caption>Peaucellier&apos;s Parallel Motion diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/peerless-injector</loc>
    <lastmod>2026-10-05T10:14:55-07:00</lastmod>
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    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/peerless-injector.png?v=1777221745</image:loc>
      <image:title>Peerless Automatic Injector: Historic Flow Path</image:title>
      <image:caption>Peerless Injector diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/penberthy-special-injector</loc>
    <lastmod>2026-10-05T10:16:55-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/penberthy-special-injector.png?v=1777221757</image:loc>
      <image:title>Penberthy Injector: Historic Automatic Flow Path</image:title>
      <image:caption>Penberthy Special Injector diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/plain-cylindrical-boilers</loc>
    <lastmod>2026-10-04T08:54:17-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/plain-cylindrical-boilers.png?v=1777221768</image:loc>
      <image:title>Plain Cylindrical Boiler: Horizontal-Shell Fill Geometry</image:title>
      <image:caption>Plain Cylindrical Boilers diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/playford-mechanical-stoker</loc>
    <lastmod>2026-10-04T09:22:17-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/playford-mechanical-stoker.png?v=1777221782</image:loc>
      <image:title>Playford Mechanical Stoker: Traveling Link-Grate Kinematics</image:title>
      <image:caption>Playford Mechanical Stoker diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/pop-safety-valve</loc>
    <lastmod>2026-10-04T11:03:00-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/pop-safety-valve.png?v=1777221793</image:loc>
      <image:title>Pop Safety Valve: Connected Topology and Declared Force Ledger</image:title>
      <image:caption>Pop Safety Valve diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/porter-governor</loc>
    <lastmod>2026-10-04T11:59:46-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/porter-governor.png?v=1777221804</image:loc>
      <image:title>Porter Governor: Symmetric Ideal Geometry and Equilibrium</image:title>
      <image:caption>Porter Governor diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/proell-governor</loc>
    <lastmod>2026-10-04T14:04:15-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/proell-governor.png?v=1777221823</image:loc>
      <image:title>Proell Governor: Declared Rotating-Mass Ledger</image:title>
      <image:caption>Proell Governor diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/pulsometer-steam-pump</loc>
    <lastmod>2026-10-04T15:10:43-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/pulsometer-steam-pump.png?v=1777221835</image:loc>
      <image:title>Pulsometer Steam Pump: Declared Charge and Water-Energy Ledger</image:title>
      <image:caption>Pulsometer Steam Pump diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/rack-gear-parallel-motion</loc>
    <lastmod>2026-10-04T16:27:27-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/rack-gear-parallel-motion.png?v=1777221849</image:loc>
      <image:title>Rack-Gear Parallel Motion: Ideal Opposed-Rack Kinematics</image:title>
      <image:caption>Rack Gear Parallel Motion diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/reversing-gear-for-single-engine</loc>
    <lastmod>2026-10-05T06:28:24-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/reversing-gear-for-single-engine.png?v=1777221868</image:loc>
      <image:title>Reversing Gear for a Single Engine: Eccentric–Slider Geometry</image:title>
      <image:caption>Reversing Gear for Single Engine diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/richardson-allen-balanced-slide-valve</loc>
    <lastmod>2026-10-05T09:15:19-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/richardson-allen-balanced-slide-valve.png?v=1777221882</image:loc>
      <image:title>Richardson-Allen Balanced Slide Valve: How It Works, Parts, Diagram and Uses in Steam Engines</image:title>
      <image:caption>Richardson-allen Balanced Slide Valve diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/ritter-rotary-engine</loc>
    <lastmod>2026-10-04T17:42:00-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/ritter-rotary-engine.png?v=1777221896</image:loc>
      <image:title>Ritter Rotary Engine Mechanism Explained: How It Works, Parts, Diagram, Formula and Uses</image:title>
      <image:caption>Ritter Rotary Engine diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/roller-piston-rotary-engine</loc>
    <lastmod>2026-10-04T17:42:17-07:00</lastmod>
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    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/roller-piston-rotary-engine.png?v=1777221907</image:loc>
      <image:title>Roller Piston Rotary Engine: How It Works, Diagram, Parts, Formula, and Uses Explained</image:title>
      <image:caption>Roller Piston Rotary Engine diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/roney-stoker</loc>
    <lastmod>2026-10-04T17:42:27-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/roney-stoker.png?v=1777221917</image:loc>
      <image:title>Roney Stoker Mechanism Explained: Stepped Grate Parts, How It Works, Diagram and Coal Feed Calculator</image:title>
      <image:caption>Roney Stoker diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/root-s-double-quadrant-engine</loc>
    <lastmod>2026-10-04T17:42:29-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/root-s-double-quadrant-engine.png?v=1777221928</image:loc>
      <image:title>Root&apos;s Double-quadrant Engine Mechanism Explained: Diagram, Parts, Formula &amp; Uses</image:title>
      <image:caption>Root&apos;s Double-quadrant Engine diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/rotary-engine-form-4</loc>
    <lastmod>2026-10-04T17:42:45-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/rotary-engine-form-4.png?v=1777221976</image:loc>
      <image:title>Rotary Engine (form 4) Mechanism: How It Works, Parts, Diagram, Animation and Indicated Power</image:title>
      <image:caption>Rotary Engine (form 4) diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/rotating-cylinder-engine</loc>
    <lastmod>2026-10-04T17:42:54-07:00</lastmod>
    <changefreq>weekly</changefreq>
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      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/rotating-cylinder-engine.png?v=1777222005</image:loc>
      <image:title>Rotating Cylinder Engine Mechanism: How It Works, Diagram, Parts, Formula and Uses Explained</image:title>
      <image:caption>Rotating Cylinder Engine diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/safety-valve</loc>
    <lastmod>2026-10-06T22:02:06-07:00</lastmod>
    <changefreq>weekly</changefreq>
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      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/safety-valve.png?v=1777222024</image:loc>
      <image:title>Weighted-Lever Safety Valve: Mechanism and Steam-Orifice Calculator</image:title>
      <image:caption>Safety Valve diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/schaeffer-and-budenberg-injector</loc>
    <lastmod>2026-10-06T22:25:50-07:00</lastmod>
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    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/schaeffer-and-budenberg-injector.png?v=1777222036</image:loc>
      <image:title>Schaeffer and Budenberg Injector Mechanism: How It Works, Parts, Diagram and Uses Explained</image:title>
      <image:caption>Schaeffer and Budenberg Injector diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/see-water-tube-boiler</loc>
    <lastmod>2026-10-04T17:47:18-07:00</lastmod>
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      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/see-water-tube-boiler.png?v=1777222047</image:loc>
      <image:title>See Water Tube Boiler: Mechanism, Diagram, Parts and Uses Explained for Steam Generators</image:title>
      <image:caption>See Water Tube Boiler diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/sellers-self-adjusting-injector</loc>
    <lastmod>2026-10-04T17:47:30-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/sellers-self-adjusting-injector.png?v=1777222070</image:loc>
      <image:title>Sellers&apos; Self-adjusting Injector Mechanism: How It Works, Parts, Diagram, and Uses Explained</image:title>
      <image:caption>Sellers&apos; Self-adjusting Injector diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/serpollet-s-steam-generator</loc>
    <lastmod>2026-10-04T17:47:34-07:00</lastmod>
    <changefreq>weekly</changefreq>
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      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/serpollet-s-steam-generator.png?v=1777222081</image:loc>
      <image:title>Serpollet&apos;s Steam Generator Explained: How the Flash Boiler Works, Parts, Diagram &amp; Uses</image:title>
      <image:caption>Serpollet&apos;s Steam Generator diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/serves-boiler-tube</loc>
    <lastmod>2026-10-07T09:50:20-07:00</lastmod>
    <changefreq>weekly</changefreq>
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      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/serves-boiler-tube.png?v=1777222092</image:loc>
      <image:title>Serves Boiler Tube Mechanism: How Ribbed Fire-Tube Heat Transfer Works, Parts, Uses &amp; Diagram</image:title>
      <image:caption>Serves Boiler Tube diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/shaking-and-tipping-furnace-grate</loc>
    <lastmod>2026-10-07T10:01:44-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/shaking-and-tipping-furnace-grate.png?v=1777222106</image:loc>
      <image:title>Shaking and Tipping Furnace Grate: Linked Sections and Heat-Balance Calculator</image:title>
      <image:caption>Shaking and Tipping Furnace Grate diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/shaking-grate-for-a-boiler-furnace</loc>
    <lastmod>2026-10-07T10:04:41-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/shaking-grate-for-a-boiler-furnace.png?v=1777222118</image:loc>
      <image:title>Shaking Grate for a Boiler Furnace: Animation and Heat-Flux Calculator</image:title>
      <image:caption>Shaking Grate for a Boiler Furnace diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/shifting-eccentric</loc>
    <lastmod>2026-10-07T10:26:39-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/shifting-eccentric.png?v=1777222132</image:loc>
      <image:title>Shifting Eccentric Mechanism Explained: Valve Gear Parts, How It Works, Diagram &amp; Calculator</image:title>
      <image:caption>Shifting Eccentric diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/simple-reversing-gear</loc>
    <lastmod>2026-10-04T17:48:10-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/simple-reversing-gear.png?v=1777222144</image:loc>
      <image:title>Simple Reversing Gear Mechanism Explained: How It Works, Diagram, Parts, Uses &amp; Stop-Angle Formula</image:title>
      <image:caption>Simple Reversing Gear diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/simple-unhooking-device</loc>
    <lastmod>2026-10-07T11:27:58-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/simple-unhooking-device.png?v=1777222154</image:loc>
      <image:title>Simple Unhooking Device: Eccentric-Rod Hook Animation and Timing Calculator</image:title>
      <image:caption>Simple Unhooking Device diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/single-d-slide-valve</loc>
    <lastmod>2026-10-07T11:40:07-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/single-d-slide-valve.png?v=1777222165</image:loc>
      <image:title>Single D Slide Valve Mechanism: How It Works, Parts, Lap and Lead Diagram</image:title>
      <image:caption>Single D Slide Valve diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/single-eccentric-valve-gear</loc>
    <lastmod>2026-10-04T17:50:42-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/single-eccentric-valve-gear.png?v=1777222176</image:loc>
      <image:title>Single Eccentric Valve Gear Mechanism: How It Works, Diagram, Parts, Timing &amp; Uses Explained</image:title>
      <image:caption>Single Eccentric Valve Gear diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/single-eccentric-variable-valve-throw</loc>
    <lastmod>2026-10-04T17:50:43-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/single-eccentric-variable-valve-throw.png?v=1777222189</image:loc>
      <image:title>Single Eccentric Variable Valve Throw Mechanism: How It Works, Parts, and Diagram</image:title>
      <image:caption>Single Eccentric Variable Valve Throw diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/slotted-cross-head</loc>
    <lastmod>2026-10-07T13:40:14-07:00</lastmod>
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      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/slotted-cross-head.png?v=1777222201</image:loc>
      <image:title>Slotted Cross-head Mechanism: How It Works, Parts, Formula, and Uses in Steam Engines</image:title>
      <image:caption>Slotted Cross-head diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/spring-steam-trap</loc>
    <lastmod>2026-10-04T17:48:47-07:00</lastmod>
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      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/spring-steam-trap.png?v=1777222229</image:loc>
      <image:title>Spring Steam Trap Mechanism: How It Works, Parts, Diagram and Sizing Calculator</image:title>
      <image:caption>Spring Steam Trap diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/standard-injector</loc>
    <lastmod>2026-10-04T17:49:03-07:00</lastmod>
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      <image:title>Standard Injector Mechanism Explained: How It Works, Parts, Diagram &amp; Calculator</image:title>
      <image:caption>Standard Injector diagram</image:caption>
    </image:image>
  </url>
  <url>
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    <lastmod>2026-10-04T17:49:07-07:00</lastmod>
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      <image:title>Starting Lever Mechanism: How It Works, Parts, Diagram and Uses in Steam Engines</image:title>
      <image:caption>Starting Lever diagram</image:caption>
    </image:image>
  </url>
  <url>
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    <lastmod>2026-10-04T17:49:10-07:00</lastmod>
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      <image:title>Steam Engine (form) Explained: Mechanism, Cylinder Layouts, Slider-Crank Diagram &amp; Parts</image:title>
      <image:caption>Steam Engine (form) diagram</image:caption>
    </image:image>
  </url>
  <url>
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    <lastmod>2026-10-04T17:49:12-07:00</lastmod>
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    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/steam-engine-guides-form-1.png?v=1777222278</image:loc>
      <image:title>Steam Engine Guides (form 1): Crosshead Mechanism, Slipper Diagram, Side-Thrust Formula Explained</image:title>
      <image:caption>Steam Engine Guides (form 1) diagram</image:caption>
    </image:image>
  </url>
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    <lastmod>2026-10-04T17:49:13-07:00</lastmod>
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      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/steam-engine-guides-form-2.png?v=1777222300</image:loc>
      <image:title>Steam Engine Guides (form 2): How Form-2 Bar Guides Work, Parts, Side Thrust &amp; PV Loading</image:title>
      <image:caption>Steam Engine Guides (form 2) diagram</image:caption>
    </image:image>
  </url>
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    <lastmod>2026-10-04T17:49:14-07:00</lastmod>
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      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/steam-engine-guides-form-3.png?v=1777222313</image:loc>
      <image:title>Steam Engine Guides (form 3): How the Four-Bar Alligator Crosshead Works, Parts &amp; Diagram</image:title>
      <image:caption>Steam Engine Guides (form 3) diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/steam-engine-guides-form-4</loc>
    <lastmod>2026-10-04T17:49:16-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/steam-engine-guides-form-4.png?v=1777222325</image:loc>
      <image:title>Steam Engine Guides (form 4): How Four-Bar Crosshead Guides Work, Parts &amp; Slipper Pressure</image:title>
      <image:caption>Steam Engine Guides (form 4) diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/steam-engine-valve-chest</loc>
    <lastmod>2026-10-04T17:49:17-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/steam-engine-valve-chest.png?v=1777222336</image:loc>
      <image:title>Steam Engine Valve Chest Mechanism Explained: D-Valve Parts, Lap, Lead and Port Opening Diagram</image:title>
      <image:caption>Steam Engine Valve Chest diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/steam-separator</loc>
    <lastmod>2026-10-04T17:49:21-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/steam-separator.png?v=1777222358</image:loc>
      <image:title>Steam Separator Mechanism Explained: How It Works, Parts, Diagram and Uses in Steam Engines</image:title>
      <image:caption>Steam Separator diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/steam-soot-sucker</loc>
    <lastmod>2026-10-04T17:49:23-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/steam-soot-sucker.png?v=1777222371</image:loc>
      <image:title>Steam Soot Sucker Mechanism Explained: How Steam-Jet Ejectors Clean Boiler Tubes</image:title>
      <image:caption>Steam Soot Sucker diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/steam-trap</loc>
    <lastmod>2026-10-04T17:49:24-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/steam-trap.png?v=1777222384</image:loc>
      <image:title>Steam Trap Mechanism Explained: How It Works, Parts, Diagram and Sizing Formula</image:title>
      <image:caption>Steam Trap diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/steam-trap-with-valve</loc>
    <lastmod>2026-10-04T17:49:27-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/steam-trap-with-valve.png?v=1777222397</image:loc>
      <image:title>Steam Trap with Valve Mechanism Explained: How It Works, Parts, Diagram, Sizing Formula and Uses</image:title>
      <image:caption>Steam Trap with Valve diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/sterling-boiler</loc>
    <lastmod>2026-10-04T17:49:42-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/sterling-boiler.png?v=1777222427</image:loc>
      <image:title>Sterling Boiler Mechanism: How a Bent-Tube Stirling Water-Tube Boiler Works, Parts and Diagram</image:title>
      <image:caption>Sterling Boiler diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/stocker-rotary-engine</loc>
    <lastmod>2026-10-06T08:09:42-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/stocker-rotary-engine-mechanism.png?v=1791299381</image:loc>
      <image:title>Stocker Rotary Engine: Sector-Piston Animation and Volume Calculator</image:title>
      <image:caption>Stocker Rotary Engine — schematic of the mechanism.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/submerged-head-vertical-boiler</loc>
    <lastmod>2026-10-05T07:49:04-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/submerged-head-vertical-boiler.png?v=1777222457</image:loc>
      <image:title>Submerged Head Vertical Boiler Mechanism: How It Works, Parts, Diagram and Uses Explained</image:title>
      <image:caption>Submerged Head Vertical Boiler diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/thornycroft-boiler</loc>
    <lastmod>2026-10-05T07:50:16-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/thornycroft-boiler.png?v=1777222487</image:loc>
      <image:title>Thornycroft Boiler: Historical Form and Energy Balance</image:title>
      <image:caption>Thornycroft Boiler diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/three-cylinder-engine</loc>
    <lastmod>2026-10-05T07:50:23-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/three-cylinder-engine.png?v=1777222499</image:loc>
      <image:title>Brotherhood Three-cylinder Engine: Radial Arrangement</image:title>
      <image:caption>Three-cylinder Engine diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/trunk-engine</loc>
    <lastmod>2026-10-05T07:52:09-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/trunk-engine.png?v=1777222518</image:loc>
      <image:title>Trunk Engine: Piston Areas and Ideal Indicated Power</image:title>
      <image:caption>Trunk Engine diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/twin-screw-vertical-cylinder-engine</loc>
    <lastmod>2026-10-05T07:52:21-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/twin-screw-vertical-cylinder-engine.png?v=1777222529</image:loc>
      <image:title>Twin-screw Vertical Engines: Ideal Indicated-power Calculator</image:title>
      <image:caption>Twin-screw Vertical Cylinder Engine diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/valve-gear-form</loc>
    <lastmod>2026-10-05T07:53:20-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/valve-gear-form.png?v=1777222541</image:loc>
      <image:title>Slide Valve: Port-opening and Lap Calculator</image:title>
      <image:caption>Valve Gear (form) diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/valve-gear-of-a-cornish-engine</loc>
    <lastmod>2026-10-05T07:53:22-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/valve-gear-of-a-cornish-engine.png?v=1777222552</image:loc>
      <image:title>Cornish Engine Valve Gear: Plug Rod, Tappets and Travel Ratios</image:title>
      <image:caption>Valve Gear of a Cornish Engine diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/vane-or-wing-governor</loc>
    <lastmod>2026-10-05T07:53:26-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/vane-or-wing-governor.png?v=1777222565</image:loc>
      <image:title>Vane Governor: Throttle Linkage and Ideal Drag-ratio Calculator</image:title>
      <image:caption>Vane or Wing Governor diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/variable-expansion-gear</loc>
    <lastmod>2026-10-05T07:53:43-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/variable-expansion-gear.png?v=1777222577</image:loc>
      <image:title>Variable Expansion Gear: Cutoff Interpolation Calculator</image:title>
      <image:caption>Variable Expansion Gear diagram</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://www.firgelliauto.com/blogs/mechanisms/vertical-engine-with-bell-crank-lever</loc>
    <lastmod>2026-10-05T07:54:19-07:00</lastmod>
    <changefreq>weekly</changefreq>
    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0615/2193/articles/vertical-engine-with-bell-crank-lever.png?v=1777222589</image:loc>
      <image:title>Engine Bell Crank: Ideal Right-angle Lever Calculator</image:title>
      <image:caption>Vertical Engine with Bell-crank Lever diagram</image:caption>
    </image:image>
  </url>
</urlset>
