Baker Steam Engine, Patent Model

This model was submitted to the U.S. Patent Office with the application for the patent issued to John G. Baker, of Philadelphia, Pennsylvania, September 10, 1878, no. 207936.
The model represents a small vertical single-acting engine in which the connecting rod is attached to the piston by a ball-and-socket joint, and the space enclosed within the cylinder and the face of the piston is alternately opened to the exhaust and to the steam pipes by rotating the piston laterally in the cylinder. The piston is rotated by a simple bent rod, one end of which turns and slides in an opening in the connecting rod, and the other end slides and turns in a socket in the skirt of the piston. Turning the piston causes two longitudinal grooves in the piston to register periodically with exhaust and steam ports in the cylinder wall.
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
Baker, John G.
place made
United States: Pennsylvania
associated place
United States: Pennsylvania, Philadelphia
Physical Description
brass (overall material)
wood (base material)
cylinder base-from catalog card: 8 in; 20.32 cm
overall: 8 1/8 in x 8 in; 20.6375 cm x 20.32 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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