Allen Automatic Injector, Patent Model

This model was submitted to the U.S. Patent Office with the application for the patent issued to Charles B. Allen, of Wadsworth, Ohio, April 15, 1902, no. 697770.
This injector is designed to start itself automatically when supplied with steam and connected to the water supply and to restart automatically if for any reason the jet should be temporarily interrupted. The peculiar feature of the injector is the forcing tube, which is provided with two successive overflows formed in it by a series of laterally opening holes which have a definite areal relation to the smallest cross-sectional area of the combining tube and which are in addition to the usual large overflow between the combining tube and the forcing tube.
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
Allen, Charles B.
place made
United States: Ohio, Wadsworth
associated place
United States: Ohio, Wadsworth
Physical Description
brass (overall material)
overall: 4 1/4 in x 6 1/2 in x 2 1/4 in; 10.795 cm x 16.51 cm x 5.715 cm
overall - from catalog card: 4 5/8 in x 6 1/2 in; x 11.7475 cm x 16.51 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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