DESCRIPTION OF MOTION
This motion has been designed by A. J. Stevens, General Master Mechanic, Central Pacific Railroad, to overcome the well-known objections to the link-motion,—viz., letting the steam escape early in the stroke when the engine is running hooked up; also, the closing of the exhaust-port early, leading to excessive compression. The motion is developed from the Walschaert motion, well known in Europe, and applied to some extent to narrow-gauge engines in this country.