Recent Blogs
Vertical Water Tube Boiler
How a Vertical Water Tube Boiler raises steam fast in tight footprints — components, sizing formula, worked example, and trade-offs against firetube designs.
Tandem Compound Vertical Engine
Tandem compound vertical engine explained — how stacked HP and LP cylinders on one piston rod doubled marine and pumping efficiency. Diagrams, formulas, examples.
Smith Rotary Engine
How the Smith rotary steam engine works — eccentric rotor, abutment vane, port timing, and worked indicated-power example for heritage demonstration steaming.
Sellers' Restarting Injector
How the Sellers' Restarting Injector feeds water into a steam boiler, why it self-restarts after a break, and how heritage railways still use it today.
Ruth's Rotary Engine
Ruth's Rotary Engine explained — abutment geometry, vane sealing, indicated power formula, and a worked steaming example from a heritage textile mill drive.
Rotary Engine (form 5)
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 2)
How a Form 2 rotary steam engine works — eccentric drum, sliding abutment, multi-vane sealing. Real numbers, worked example, and heritage steam applications.
Rotary Engine (form 1)
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...
Mechanical Stoker
How a Mechanical Stoker feeds coal to a boiler firebox — ram and worm types, feed-rate sizing, real locomotive and industrial examples, and tuning numbers.
Dake Square Piston Engine
How the Dake Square Piston Engine works — the oscillating square piston mechanism that replaced crankshafts in 19th-century portable steam plants and pumps.
Columbia Stoker
Columbia Stoker explained — how this underfeed coal stoker feeds steam boilers, sizing the worm feed rate, real heritage power applications and design tradeoffs.
American Boiler Stoker
Learn how the American boiler stoker feeds coal automatically — ram strokes, retort sizing, air zoning, and worked-example combustion rates for power plants.
Jones Mechanical Stoker
How the Jones Mechanical Stoker feeds coal to locomotive fireboxes — screw conveyor, steam jets, distribution table, and sizing math for heritage steam crews.
Feed Worm and Air Blast
Feed Worm and Air Blast explained — how the screw conveyor and pneumatic dispersal feed pulverised fuel into industrial boilers, with formulas and a worked...
Bartrum and Powell Rotary Engine
How the Bartrum and Powell rotary steam engine works — abutment vane geometry, sealing limits, indicated power formula, and a worked rebuild example.
Toe and Lifter for Puppet Valves
Toe and lifter for puppet valves — how Cornish and beam-engine valve gear lifts the equilibrium puppet valve, with a worked example for a pumping...
Tappet Lever Valve Motion
Tappet lever valve motion explained — how cam-driven tappets time steam admission and exhaust on stationary engines, mill drives, and early locomotives.
Stevens Boiler
Stevens Boiler explained — porcupine-tube design, water circulation, steam rate, and real marine examples from the 1804 Stevens Twin-Screw and beyond.
Stephenson Valve Gear
Stephenson valve gear explained — how the link motion controls steam admission, cutoff, and reverse on locomotives, with worked sizing example and tradeoffs.
Steeple Engine
Steeple engine explained — vertical inverted steam engine design, dual-rod kinematics, marine and mill applications, sizing formulas, and a worked example.
Steam Pump
How a Steam Pump works, with formulas, a worked example sizing a duplex feedwater pump for a textile mill boiler, and real-world applications.
Spring Balanced Centrifugal Governor
Learn how a spring balanced centrifugal governor regulates steam engine speed across load changes, with formula, worked example, and real boiler-room applications.
Rotary Multicylinder Engine
Rotary Multicylinder Engine explained — how multiple cylinders share a common crank to deliver smooth torque for marine, locomotive, and industrial steam drives.
Rotary Engine (form 3)
Rotary Engine form 3 explained — how the eccentric piston, abutment, and steam ports convert pressure into continuous shaft torque. Examples, formulas, design notes.
Root's Square Piston Engine
Root's Square Piston Engine explained — how the unique square-piston steam engine works, real 1890s applications, design math, and a worked sizing example.