Robinson and Gresham Injector, Patent Model

This model was submitted to the U.S. Patent Office with the application for the patent issued to John Robinson and James Gresham, of Manchester, England, May 29, 1866, no. 55218.
The feature of this injector is to provide a means of varying the area of the annular space through which the water enters the combining tube for the purpose of properly proportioning the steam and water supplies. The combining tube is made free to slide in the direction of the axis of the tube and is adjusted by a hand wheel at the side of the injector, the shaft of which projects into the injector and carries a small pinion that meshes with a short rack formed on the tube. Packing around the sliding tube is dispensed with by forming the tube in two parts, a fixed part and a sliding part, and proportioning the two parts so that the ends of the sliding part will be “opposite that part of the passing current where it has attained its highest velocity; and by this arrangement the passing liquid has no tendency to escape but rather to draw in air or fluid.”
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
Robinson, John
Gresham, James
place made
Republic of Ireland
associated place
United Kingdom: England, Manchester, Manchester
overall: 3 3/4 in x 6 in x 15 1/8 in; 9.525 cm x 15.24 cm x 38.4175 cm
ID Number
accession number
catalog 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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