Stevens Steam-Engine Condenser, Patent Model

This model was submitted to the U.S. Patent Office with the application for the patent issued to Francis B. Stevens, November 3, 1863, no. 40510.
The condenser represented in the model consists of a large vertical cylinder and pump plunger with various connected chambers designed to function as a condenser, a condenser air pump, and feed-water hot well and heater.
The invention “consists in simplifying the apparatus that condenses the steam discharged by the first eduction from the cylinder of a condensing steam engine by closing the hot well of the engine against the atmosphere and by keeping a portion of the space of the hot well free from water, and by delivering the steam discharged from the cylinder by the first eduction into the hot well, so that it may be condensed or partially condensed by the water delivered by the air-pump into the hot well.” The hot well is thus made “to act also as an additional condenser and dispense altogether with an additional air pump to draw the water from the additional condenser.”
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.
Currently not on view
date made
patent date
Stevens, Francis B.
place made
United States: New York, New York
associated place
United States: New York, New York
overall - from catalog card: 8 in x 8 in; 20.32 cm x 20.32 cm
overall: 11 in x 8 in x 8 in; 27.94 cm x 20.32 cm x 20.32 cm
ID Number
catalog number
accession number
patent number
See more items in
Work and Industry: Mechanical and Civil Engineering
Industry & Manufacturing
Bulletin 173
Engineering, Building, and Architecture
Data Source
National Museum of American History


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