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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…

"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…