Felsenthal FAE-21 Artillery Protractor

Description:

This clear plastic semicircular protractor is divided by tens and marked by hundreds from 100 to 3,100 mils and from 3,300 to 6,300 mils. Mils are units used in artillery and other military applications; 1,000 mils is equivalent to 56.25°. A pinhole is at the origin point. The bottom edge of the protractor is divided by hundreds and marked by five hundreds from 0 to 7,000. A small vernier appears to the left of the scale, and the scale is labeled: 1/25,000 METERS.

The interior of the protractor has a semicircular opening with a groove parallel to the origin point. Below the opening is a maker's mark: 12 INCH (/) G. FELSENTHAL & SONS, INC. (/) FAE-21. Donor Ben Rau dated the object to 1945, but the form of the signature indicates the protractor was probably manufactured for the U.S. Army in the 1950s.

This protractor is very similar to 1977.1141.11. See also 1977.1141.01, 1977.1141.02, 1977.1141.03, 1977.1141.05, 1977.1141.08, 1977.1141.09, 1977.1141.10, 1977.1141.12, 1977.1141.19, 1977.1141.20, 1977.1141.21, 1977.1141.22, 1977.1141.23, 1977.1141.24, 1977.1141.30, and 1977.1141.39.

Date Attributed By Donor: 1945Date Made: 1960s

Maker: G. Felsenthal & Sons, Inc.

Location: Currently not on view

Subject: MathematicsProtractorArtillery

Subject:

See more items in: Medicine and Science: Mathematics, Science & Mathematics, Protractors

Exhibition:

Exhibition Location:

Credit Line: Gift of Ben Wharton Rau and Margery Felsenthal Rau

Data Source: National Museum of American History

Id Number: 1977.1141.22Accession Number: 1977.1141Catalog Number: 336406

Object Name: protractor

Physical Description: plastic (overall material)Measurements: overall: .2 cm x 30.5 cm x 16.5 cm; 3/32 in x 12 in x 6 1/2 in

Guid: http://n2t.net/ark:/65665/ng49ca746a7-3ea5-704b-e053-15f76fa0b4fa

Record Id: nmah_904374

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