Tank Range Card

Description
This chart, drawn on a rigid white plastic sheet, has five equally spaced concentric circles, each divided into eight equal sections by lines through the center of the circle. The outer circle is divided into 64 equal segments, which are numbered counterclockwise from 0 to 32 on the left half of the circle. On the right half, segments are numbered from 0 at the bottom counterclockwise to 30 at the top, and also from (34) to (64).
A mark at the bottom left reads: CARD, TANK RANGE (/) 8724207. A mark on the left top reads: HUNDREDS OF MILS. There are 6400 mils in a circle of 360 degrees angular measure.
The object comes from the Felsenthal Collection of computing devices. According to the accession file it was made by Felsenthal for the U.S. Army in 1955, and had Felsenthal designation FA0-51. It may have been used by the tank gunner to lay his gun on target, before the availability of electronic or laser sighting.
Reference:
Accession file 1977.1141.
Location
Currently not on view
Object Name
chart
date made
1955
maker
G. Felsenthal & Sons, Inc.
Physical Description
plastic (overall material)
Measurements
overall: .4 cm x 28 cm x 28 cm; 5/32 in x 11 1/32 in x 11 1/32 in
place made
United States: Illinois, Chicago
ID Number
1977.1141.06
catalog number
336390
accession number
1977.1141
subject
Mathematics
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Plotting Boards
Military
Mathematical Charts and Tables
Data Source
National Museum of American History, Kenneth E. Behring Center

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