This model was submitted to the U.S. Patent Office with the application for the patent issued to Henry R. Worthington, of New York, New York, June 20, 1871, no. 116131.
The model is a relief panel showing a section through the two steam cylinders of a duplex pump arranged to use steam at boiler pressure in one steam cylinder of small diameter, expand the exhaust steam in a receiver of much larger volume than the small cylinder, and use the steam at low pressure in a second cylinder of larger diameter. This arrangement was devised to permit the use of steam expansively in a duplex pump without the use of two compound cylinders, as was formerly the method.
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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