Desmond Injector, Patent Model

This model was submitted to the U.S. Patent Office with the application for the patent issued to John Desmond, of Cincinnati, Ohio, October 8, 1901, no. 683914; assigned to the Lunkenheimer Co.
Features of this injector are the construction of the starting lever, which with one motion operates both the steam and overflow valves and also permits the overflow valve to close independently of the lever; a removable ring of resistant metal inserted in the combining tube at its smallest diameter to receive the corroding action of the jet at that point; and an arrangement of steam and water passages designed to prevent the raising of the temperature of the feed water to such a temperature as to deposit scale within the tubes of the injector.
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
Desmond, John
place made
United States: Ohio
associated place
United States: Ohio, Cincinnati
overall: 3 1/4 in x 19 3/4 in x 9 3/4 in; 8.255 cm x 50.165 cm x 24.765 cm
overall-from catalog card: 10 in x 20 in; 25.4 cm x 50.8 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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