The Milometer slide rule computer

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
Object Name
slide rule computer
slide rule
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
ID Number
catalog number
accession number
Computers & Business Machines
World War I
See more items in
Medicine and Science: Chemistry
Data Source
National Museum of American History, Kenneth E. Behring Center

Visitor Comments

Add a comment about this object

**Please read before submitting the form**

Have a comment or question about this object to share with the community? Please use the form below. Selected comments will appear on this page and may receive a museum response (but we can't promise). Please note that we generally cannot answer questions about the history, rarity, or value of your personal artifacts.

Have a question about anything else, or would you prefer a personal response? Please visit our FAQ or contact page.

Personal information will not be shared or result in unsolicited e-mail. See our privacy policy.

Enter the characters shown in the image.