This model was submitted to the U.S. Patent Office with the application for the two patents issued to George H. Corliss, May 9, 1876, nos. 177059 and 177099.
The model represents the valve gear of a horizontal cylinder with a separate rotary steam and exhaust valve at each end of the cylinder. The valves are driven from one wrist plate, the steam valves through disengaging hooks or catches, which are controlled by the governor, the exhaust valves by a series of permanently connected links designed to effect a quick closing of the exhaust valves. The steam valves are closed by vacuum dash pots instead of by weights or springs as in the earlier Corliss valve gears.
Reference:
This description comes from the 1939 Catalog of the Mechanical Collections of the Division of Engineering United States Museum Bulletin 173 by Frank A. Taylor.
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