The Milometer slide rule computer

The Milometer slide rule computer

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Usage conditions apply
One inscription on this celluloid rule reads “COPYRIGHT G. P. WILHELM 1917 / MFR. AND DISTRIBUTOR EDWARD C. MCKAY / CLEVELAND, OHIO / PATENT APPLIED FOR.” Another reads “THE MILOMETER.” Glenn Perrin Wilhelm (1889-1941) was an officer in the U.S. Army, and an authority on ballistics. He devised this slide rule-like computer for forward observers, to help them direct the indirect fire of machine guns and small arms.
Ref: Glenn P. Wilhelm, Machine Gun Fire Control (Cleveland: Edward C. McKay, 1917).
Currently not on view
Object Name
slide rule computer
slide rule
date made
place made
United States: Ohio, Cleveland
Associated Place
United States: New Jersey
Physical Description
cellulose nitrate (overall material)
overall: 3.5 cm x 16.8 cm x.5 cm; 1 3/8 in x 6 5/8 in x 3/16 in
overall: 1 1/2 in x 6 5/8 in x 3/16 in; 3.81 cm x 16.8275 cm x.47625 cm
ID Number
catalog number
accession number
World War I
See more items in
Medicine and Science: Chemistry
Computers & Business Machines
Data Source
National Museum of American History
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