Recent Blogs
Rotary Engine (form 5) Mechanism: How It Works, Parts, Formula, and Heritage Steam Uses Explained
Rotary Engine Form 5 explained — how the abutment-and-piston layout converts steam pressure to shaft torque, with worked numbers for heritage mill drives.
Rotary Engine (form 1) Mechanism: How a Single-Vane Steam Rotary Works, Parts and Uses Explained
Rotary Engine form 1 explained — how a single-vane steam rotary engine produces torque, where it fits in heritage power plant, and how to size...
Cylindrical Double Flue Boiler Mechanism: How It Works, Parts, Formula and Industrial Uses Explained
Follow the Lancashire boiler’s twin furnace tubes and external gas passes. Estimate useful heat and steam flow from fuel energy, efficiency and enthalpy rise.
Cahall Vertical Water Tube Boiler Mechanism: How It Works, Parts, Diagram, and Uses Explained
Explore the Cahall boiler’s vertical tubes, annular upper drum and side furnace. Convert boiler horsepower to equivalent evaporation and gauge psi to bar.
Worthington Boiler Mechanism: How the Horizontal Return Fire-Tube Boiler Works, Parts and Uses
Explore a horizontal fire-tube boiler schematic and tube surface area. The heat-to-steam and scale results are hypothetical comparisons, not operating predictions.
Wilkinson's Steam Turbine: Rotor Rim-speed Comparison
Compare rim speeds for two rotor diameters at the same RPM. This circular-motion calculation does not predict turbine power, efficiency or safe speed.
Wheeler Vertical Tube Boiler Mechanism: How It Works, Parts, Diagram, and Steam Calculator
Compare vertical-tube surface area and assumed heat input. The evaporation estimate uses an approximate latent heat and does not rate a boiler.
Submerged Head Vertical Boiler Mechanism: How It Works, Parts, Diagram and Uses Explained
See the submerged-head vertical boiler, its circulation diaphragm and clear centre. Explore flow area and mean water speed with a simplified calculator.
Sterling Boiler Mechanism: How a Bent-Tube Stirling Water-Tube Boiler Works, Parts and Diagram
Stirling boiler explained — how the bent-tube water-tube design works, why power stations adopted it, sizing formulas, and real heritage and industrial applications.
Steam Engine Guides (form 4): How Four-Bar Crosshead Guides Work, Parts & Slipper Pressure
Steam engine guides (form 4) keep the crosshead aligned and absorb piston-rod side thrust. Learn the geometry, loading limits, and heritage engineering use.
Serves Boiler Tube Mechanism: How Ribbed Fire-Tube Heat Transfer Works, Parts, Uses & Diagram
Explore the longitudinal ribs inside a Serve boiler tube. Compare selected bore area, rib dimensions, internal surface ratio and geometric hydraulic diameter.
Schaeffer and Budenberg Injector Mechanism: How It Works, Parts, Diagram and Uses Explained
Explore the Schaeffer and Budenberg exhaust injector, its hinged combining tube and starting sequence, with a clearly bounded fixed-density calculation.
Rotary Engine (form 4) Mechanism: How It Works, Parts, Diagram, Animation and Indicated Power
Rotary Engine form 4 explained — eccentric piston geometry, steam admission, indicated power formula, and a worked heritage marine example with real numbers.
Plain Cylindrical Boiler: Horizontal-Shell Fill Geometry
Plain Cylindrical Boilers explained — how the shell, flue, and grate generate steam for heritage mills, breweries, and early factories. Sizing formulas inside.
National Automatic Injector: Four Fixed Tubes and Successive Checks
Explore the National automatic injector's four fixed tubes and successive check valves. Calculate circular bore areas from example diameters.
Moyes 1898 Water-Tube Boiler: Patent Layout and Tube-Bank Geometry
Explore the 1898 Moyes water-tube boiler patent and calculate adjacent-row diagonal spacing, surface gap and vertical overlap for a staggered tube bank.
Kipp Rotary-Piston Engine: Historical Layout and Power Calculator | FIRGELLI
Explore Hiscox’s rotating-cylinder Kipp engine arrangement and calculate cycle-average power from entered pressure, volume, speed and efficiency.
Inverted Governor: Linkage Illustration and Speed-Bound Calculator | FIRGELLI
Explore an inverted-governor linkage and calculate square-root speed bounds for a declared speed-squared relationship. The outputs do not predict actual governor regulation.
Hazelton Boiler: Historical Layout and Heat-Balance Calculator | FIRGELLI
Learn the central-drum radial-tube arrangement and compare assumed heat-transfer quantities. The calculator is a general energy balance, not a boiler rating.
Forrester Rotary Engine: Historical Mechanism and Ideal Torque | FIRGELLI
Explore Hiscox’s Forrester rotary-engine arrangement and a separate ideal pressure-force, lever-arm torque and power comparison.
Dion Vehicle Boiler: Concentric Drums, Water Tubes and Grate-Area Comparison
Explore the Dion boiler’s concentric drums and inclined water tubes. Compare grate area for a steam demand using two measured grate-area evaporation rates.
Brownley Injector: Two-stage Animation and Thermal Balance Calculator
Explore the Brownley injector’s lifting and forcing jets and common overflow cock. Compare two-stage condensation temperatures and mass flows in an animated calculator.
Boyer's Water Tube Boiler Explained: Mechanism, Diagram, Parts, Uses & Natural Circulation
Explore Boyer’s coiled furnace-wall boiler and compare the effects of elevation and mean fluid densities on an idealized circulation driving pressure.