Recent Blogs
Joy's Hydraulic Shifting Eccentric
Joy's hydraulic shifting eccentric explained — how marine triple-expansion engines reverse without a separate eccentric, with worked example and design tradeoffs.
Joy's Valve Gear
Joy's Valve Gear explained — radial valve gear without eccentrics, used on LNWR locomotives and marine engines. Geometry, formula, worked example, trade-offs.
Inverted Governor
Inverted governor explained — how the upside-down flyball mechanism regulates steam engine speed, with formulas, real heritage engine examples, and design tradeoffs.
Internally Fired Flue Boiler
Internally fired flue boiler explained — design, evaporation rate formula, worked example, and real heritage steam applications from breweries to traction engines.
Internal Fired Cylindrical Tubular Boiler
How an Internal Fired Cylindrical Tubular Boiler works, with the equivalent evaporation formula, a worked sawmill example, and trade-offs vs water-tube boilers.
Independent Jet Condenser Pump
Independent Jet Condenser Pump explained — how the air pump pulls vacuum on a steam engine condenser, sizing rules, and worked examples for marine plant.
Inclined Paddle-wheel Engine
Inclined paddle-wheel steam engine explained — geometry, formulas, and a worked example for heritage paddle steamer restoration on Mississippi sternwheelers.
Huntoon Governor
How the Huntoon Governor regulates steam engine speed using shaft-driven fan vanes — physics, formulas, worked example for heritage engine restoration.
Hotchkiss Boiler Cleaner
How a Hotchkiss Boiler Cleaner removes scale and sludge from steam boilers using a soda-ash injector — sizing, dosing, and worked examples for heritage plant.
Horizontal Tubular Boiler
Horizontal Tubular Boiler explained — how the shell, fire-tubes and gas passes generate steam for mills, factories and stationary engines. Sizing formula included.
Horizontal Swing Check Valve
Horizontal Swing Check Valve explained — how the hinged disc seals reverse flow in steam condensate and feedwater lines, with sizing math and worked example.
Holly Rotary Engine
Holly Rotary Engine explained — how the eccentric piston and abutment work, real heritage examples, formulas, and a worked horsepower calculation for restorers.
High-speed Tandem Compound Engine
How a high-speed tandem compound steam engine works, with a worked indicated-horsepower example for a marine generator set, plus design tradeoffs and FAQs.
Herreshoff Boiler
Herreshoff coil boiler explained — how the helical tube generator raises steam fast for steam launches, with sizing math, worked example and tradeoffs.
Heintz Steam Trap
Heintz steam trap explained — how the bucket-and-valve mechanism drains condensate from steam mains, sized for heritage marine and industrial plant.
Hazelton Boiler
Understand the Hazelton boiler — a vertical water-tube design used in 19th-century steam launches and small mills. Construction, sizing, and worked example.
Harrison Boiler
Engineer's guide to the Harrison Boiler — how Joseph Harrison's 1859 sectional cast-iron boiler works, evaporation rates, worked example, and design tradeoffs.
Hanging Water Drum Cylindrical Boiler
How a hanging water drum cylindrical boiler works — design, sizing formula, worked example, and tradeoffs for heritage steam plant operators and millwrights.
Hancock Inspirator
Hancock Inspirator explained — how this steam-driven boiler feedwater injector works, sizing math, locomotive use, and troubleshooting lift and delivery faults.
Hackworth Valve Gear
Hackworth valve gear explained — how the slotted link drives the valve in steam locomotives, with formulas, a worked cut-off example, and tradeoffs vs Stephenson.
Gridiron Slide Valve
Learn how a Gridiron Slide Valve works in steam engines, why it cuts port travel by 75%, and where it powers locomotives, marine engines, and...
Gooch Valve Gear
Gooch valve gear explained — how Daniel Gooch's stationary-link reversing gear controls steam admission in locomotives, with formula, worked example and tradeoffs.
Globe Valve
Globe Valve explained — how the disc-and-seat throttling action works, sizing with Cv, and real steam plant examples from refineries to heritage boilerhouses.
Galloway Boiler
Galloway boiler explained — how the tapered cross-tubes boost heat transfer, real heritage applications, sizing formula, and a worked example for steam plant.
Furnace Grate with Dumping Sections
Furnace grate with dumping sections lets stationary boiler operators drop clinker and ash on demand without dropping fires. Steam-power engineering explained.