Felsenthal FAE-18 Artillery Protractor

Description:

This clear plastic semicircular protractor is divided to ten mils and marked by hundreds from 100 to 3,100 and from 3,300 to 6,300. The bottom edge is divided by quarter-yards and marked by ones from 0 to 26. There is a vernier to the left of the divisions, and the scale is given as 1:10,000. Inside the divisions is a second ruler, divided by two yards and marked by twos from -2 to 52. The scale is given as 1:20,000.

A rectangular slot inside these rulers is divided by half-inches and marked by ones from 0 to 7. A vernier is to the left of this ruler. The upper interior of the protractor contains two scales forming a right-angled point. There are ten divisions between each unit on the scales. The outer markings are by ones from 0 to 10 and are labeled: YARDS 1:20,000. The inner markings are by twos from 2 to 20; they are labeled: YARDS 1:40,000.

The interior of the protractor also bears several marks: U.S. (/) W = (R X M)/1000; M = (W X 1000)/R. The maker's mark is toward the right side: FSN 6675-641-5711 (/) G. FELSENTHAL & SONS, INC. (/) CHICAGO 18, ILL. (/) FAE-18.

Donor Ben Rau identified the object as a machine gun protractor and dated it to 1945. It was manufactured for the U.S. Army.

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, 1977.1141.30, and 1977.1141.39.

Date Attributed By Donor: 1945Date Made: ca 1945

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: 1977.1141.24Accession Number: 1977.1141Catalog Number: 336408

Object Name: protractor

Physical Description: plastic (overall material)Measurements: overall: .1 cm x 25.3 cm x 14 cm; 1/32 in x 9 31/32 in x 5 1/2 in

Guid: http://n2t.net/ark:/65665/ng49ca746a7-5991-704b-e053-15f76fa0b4fa

Record Id: nmah_904380

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