Felsenthal FAE-31Artillery Protractor

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Description
This semicircular protractor is cut out from the center of a white piece of rectangular plastic. The front is marked in black print. The protractor is divided by half-degrees and marked by tens from 0° to 180° and from 180° to 360°. An arrow points to the index, or origin, point. The bottom edge of the rectangle is divided by two millimeters and marked by single centimeters from 0 to 20. The number 5731 is printed above the left side of the centimeter ruler.
The upper-left corner is divided by fifties and marked by thousands from 3000 to 1000 to 1000 to 3000. The scale is labeled: YARDS (/) RF = 1:50,000. Between the scale and protractor is printed: USMA (/) MODEL (/) 1953. The upper-right corner is divided by twenties and marked by hundreds from 5 to 1, 1000 to 1[00] to 1000, and 1 to 5. The scale is labeled: YARDS (/) RF = 1:25,000. Between the scale and protractor is printed: PROPERTY OF (/) M. T. AND G. (/) USMA.
The back of the protractor is marked in red print. The protractor is divided into units of twenty mils and marked by two hundreds from 0 to 3200 and from 3200 to 6400. An arrow points to the index point. The bottom edge of the rectangle is divided by tenths of an inch and marked by ones from 0" to 8".
The upper-left corner is divided by fifties and marked by thousands from 3,000 to 1,000 to 1,000 to 3,000. The scale is labeled: METERS (/) RF = 1:50,000. Between the scale and protractor is printed: USMA (/) MODEL (/) 1953. The upper-right corner is divided by twenties and marked by hundreds from 5 to 1, 1,000 to 1[00] to 1,000, and 1 to 5. The scale is labeled: METERS (/) RF = 1:25,000. Between the scale and protractor is printed: PROPERTY OF (/) M. T. AND G. (/) USMA.
Felsenthal Instruments Company manufactured this protractor for the United States Military Academy at West Point, N.Y. Donor Ben Rau, who worked for Felsenthal, dated the object to 1954.
See also 1977.1141.01, 1977.1141.02, 1977.1141.03, 1977.1141.05, 1977.1141.08, 1977.1141.09, 1977.1141.10, 1977.1141.11, 1977.1141.12, 1977.1141.18, 1977.1141.19, 1977.1141.20, 1977.1141.21, 1977.1141.22, 1977.1141.23, 1977.1141.24, and 1977.1141.39.
Location
Currently not on view
date attributed by donor
1954
maker
Felsenthal
Physical Description
plastic (overall material)
Measurements
overall: .1 cm x 21.5 cm x 10.1 cm; 1/32 in x 8 15/32 in x 3 31/32 in
ID Number
1977.1141.30
accession number
1977.1141
catalog number
336414
Credit Line
Gift of Ben Wharton Rau and Margery Felsenthal Rau
subject
Mathematics
Protractor
Artillery
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Protractors
Data Source
National Museum of American History