Mechanical and Civil Engineering, Division of [former name], NMAH, SI
Work and Industry, Division of, NMAH, SI
Sprague, Frank J
6 cu. ft.; 13 boxes; 8 oversize folders
Charles Richardson Pratt, mechanical engineer from Montclair, New Jersey, worked with Frank J. Sprague on the development of the first electric elevator capable of heavy duty, high-rise service.
These papers contain personal materials of Charles R. Pratt; letterpress copybooks; engineering notebooks; diaries; material relating to the development of the heavy-duty, high-rise electric elevator; material concerning elevator cable equalizers and safety devices, Morton-Jacobsen and other lathe chucks, lathe drives and the Pratt Driver, the hydraulic transmission of power in trucks, and ship steering gear; and studies reports, drawings, photographs, catalogs, and trade literature concering mechanical engineering.
Charles Richardson Pratt Papers, 1888-1931, 1935, Archives Center, National Museum of American History