Friedman Injector, Patent Model

This model was submitted to the U.S. Patent Office with the application for the patent issued to Alexander Friedman, of Vienna, Austria, April 6, 1869, no. 88620.
The model represents a steam injector designed for elevating or forcing water and reducing the shock produced by the sudden condensation of steam when brought into contact with the water.
The injector is of the usual form with the addition of a small auxiliary steam jet, or ejector, which serves to draw water into the mixing chamber before the main steam valve is opened. A safety cock is also provided, which permits a part of the water to escape as the pressure is being raised to the degree sufficient to overcome the resistance against which the injector is working.
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
steam pump, model
patent model, pump, steam
date made
patent date
Friedmann, Alexander
Physical Description
brass (overall material)
overall: 8 1/4 in x 11 in x 6 3/8 in; 20.955 cm x 27.94 cm x 16.1925 cm
place made
associated place
Österreich: Wien, Vienna
ID Number
accession number
catalog number
patent number
Engineering, Building, and Architecture
Industry & Manufacturing
Bulletin 173
See more items in
Work and Industry: Mechanical and Civil Engineering
Bulletin 173
Data Source
National Museum of American History, Kenneth E. Behring Center
Related Publication
Frank A. Taylor. Catalog of the Mechanical Collections of the Division of Engineering United States National Museum, Bulletin 173
Additional Media

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