Baker and Baldwin Rotary Steam Engine, Patent Model

This model was submitted to the U.S. Patent Office with the application for the patent issued to William H. Baker and Samuel H. Baldwin, of Cohoes, New York, August 21, 1839, no. 1295.
This is an early example of a steam engine in which two cams turn together in a closed casing so that steam admitted to the casing will force apart abutments on the cams and cause the cams and the shafts on which they are mounted to turn. This engine may also be used as a pump.
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
Baldwin, Samuel H.
Baker, William H.
place made
United States: New York
associated place
United States: New York, Cohoes
Physical Description
iron (overall material)
brass (overall material)
overall-from catalog card: 6 in x 8 in x 8 in; 15.24 cm x 20.32 cm x 20.32 cm
overall: 5 1/2 in x 7 3/4 in x 7 3/4 in; 13.97 cm x 19.685 cm x 19.685 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