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"When set full gear forward, the valve admits steam to the crank end of the cylinder, and the crank revolves as shown by the arrow. As the crank turns, both eccentrics impart motion to the link, but the "go ahead" link pin H approximately coincides with the link block." —Derr, 1911

Eccentric Motion of the Steam Engine Crank in Full Gear

"When set full gear forward, the valve admits steam to the crank end of the cylinder, and the crank…

A Joy valve gear for steam engine rotating the wheel in the direction of the arrow. The lever F changes the direction the wheel would turn when turned to point B.

Joy Steam Engine Valve Gear Rotating Wheel

A Joy valve gear for steam engine rotating the wheel in the direction of the arrow. The lever F changes…

An outline of the Marshall gear from a steam engine. The piston rotates the crank shaft at point H around axis S. The rod F is connected to the bottom rod E. Rod F rotates at axis P to rotate the engine backwards and forward.

Outline of a Steam Engine Marshall Gear Reducing Friction and Wear

An outline of the Marshall gear from a steam engine. The piston rotates the crank shaft at point H around…

An illustration of the steam engine with Walschaert gear system on rail tracks. The piston moves the long shaft connected to the wheel. The lever adjusts the rods on top up and the lower ones down to rotate the wheels opposite from the arrows.

Steam Engine with Walschaert Gear on Railroad

An illustration of the steam engine with Walschaert gear system on rail tracks. The piston moves the…

"As the speed increases, and the link is 'notched up', the lead is increased as the cut—off is shortened, and at high speed we have a large lead. With the Gooch link, the lead can be set for average running speed, and although a little too great for good work at slow speed." —Derr, 1911

Steam Engine Gooch Link and Valve Gear Arrangement

"As the speed increases, and the link is 'notched up', the lead is increased as the cut—off is…

"This arrangement makes it possible to place the valve and steam chest above the valve motion. A rod from the bell crank lever on the reverse shaft E, leads back to the engineer's cab and connects with the reverse lever." —Derr, 1911

Steam Engine Rocker Arrangement with Valve and Reverse Rod in Eccentric Motion

"This arrangement makes it possible to place the valve and steam chest above the valve motion. A rod…