This small, 3-cylinder, radial, air engine was designed and made by Henry James Kimman (1862-1921), a pioneer inventor of small portable piton air drills. It is believed that the engine was built for a steering engine on a steam roller. The experience gained in the construction of the engine directed his interest to the design of air drills, in which field he made valuable contributions.
Reference:
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.
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