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Dow Direct-Acting Steam Pump, Patent Model

Dow Direct-Acting Steam Pump, Patent Model

This model was filed to the U.S. Patent Office with the application for the patent issued to G. E. Dow, of San Francisco, California, November 4, 1879, no. 221220.
The model represents a form of valve gear for a direct-connected steam engine in which the main valve is partially operated by a system of cam-shaped levers actuated from the main piston rod and partially by a supplementary steam piston, the movement of which is controlled by valves connected to the same levers.
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
Object Name
valve gear, steam pump, patent model
patent model, valve, steam engine
Object Type
Patent Model
date made
patent date
Dow, George E.
place made
United States: California
associated place
United States: California, San Francisco
Physical Description
wood (overall material)
overall-from catalog card: 5 in x 3 in x 8 in; 12.7 cm x 7.62 cm x 20.32 cm
overall: 5 5/8 in x 3 1/2 in x 12 3/8 in; 14.2875 cm x 8.89 cm x 31.4325 cm
ID Number
accession number
catalog number
patent number
See more items in
Work and Industry: Mechanical and Civil Engineering
Bulletin 173
Engineering, Building, and Architecture
Industry & Manufacturing
Data Source
National Museum of American History
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