The Milometer slide rule computer

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Description (Brief)
A WWI machine gun fire control computer, labelled the Milometer. This slide rule-like computer was used by forward observers to pinpoint the indirect fire of machine guns and small arms. Copyrighted by G. P. Wilhelm in 1917, it was manufactured and distributed by Edward C. McKay of Cleveland, Ohio. The sliding part and the top are cream celluloid; the bottom is clear yellow celluloid.
Directions for the slide rule's use can be found in the book Machine Gun Fire Control by Captain Glenn P. Wilhelm, published in 1917 by Edward C. McKay.
Currently not on view
date made
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
related event
World War I
See more items in
Medicine and Science: Chemistry
Computers & Business Machines
Data Source
National Museum of American History