Felsenthal FAE-9 Protractor

Description:

This clear plastic rectangular protractor is divided by single degrees and marked by tens from 10° to 170° and from 190° to 350°. Pinholes near the 20° and 60° marks allow for positioning the protractor. The bottom edge is divided by tenths of an inch and marked by ones from 1" to 5". The interior of the protractor contains three scales of equal parts: 1) divided by hundreds and marked by five hundreds from 0 to 2,500 yards, for a scale of 1/20,000; 2) divided by hundreds and marked by thousands from 0 to 7,000 yards, for a scale of 1/62,500; and 3) divided by hundreds and marked by five hundreds from 0 to 2,000 meters, for a scale of 1/20,000. There are verniers to the left of the first and third scales.

Near the top of the protractor is marked: U.S. 1951. The 1951 is believed to refer to the date of the object. The maker's mark is: G. FELSENTHAL & SONS, INC. (/) PART NO. FAE-9.

This protractor is almost exactly like 1977.1141.09. See also 1977.1141.01, 1977.1141.02, 1977.1141.03, 1977.1141.05, 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, 1977.1141.30, and 1977.1141.39.

Reference: Deborah J. Warner, “Browse by Maker: Felsenthal,” National Museum of American History Physical Sciences Collection: Navigation, http://americanhistory.si.edu/collections/navigation/maker.cfm?makerid=173.

Date Attributed By Donor: 1951

Maker: G. Felsenthal & Sons, Inc.

Location: Currently not on view

Place Made: United States: Illinois, Chicago

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: 1977.1141.08Accession Number: 1977.1141Catalog Number: 336392

Object Name: protractor

Physical Description: plastic (overall material)Measurements: overall: .3 cm x 15.2 cm x 4.5 cm; 1/8 in x 5 31/32 in x 1 25/32 in

Guid: http://n2t.net/ark:/65665/ng49ca746a7-2d01-704b-e053-15f76fa0b4fa

Record Id: nmah_904365

Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.

If you would like to know how you can use content on this page, see the Smithsonian's Terms of Use. If you need to request an image for publication or other use, please visit Rights and Reproductions.