Object Details
- G. Felsenthal & Sons, Inc.
- 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.
- Location
- Currently not on view
- Credit Line
- Gift of Ben Wharton Rau and Margery Felsenthal Rau
- date attributed by donor
- 1945
- ca 1945
- ID Number
- 1977.1141.24
- accession number
- 1977.1141
- catalog 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
- See more items in
- Medicine and Science: Mathematics
- Science & Mathematics
- Protractors
- National Museum of American History
- Subject
- Mathematics
- Protractor
- Artillery
- Record ID
- nmah_904380
- GUID (Link to Original Record)
- https://n2t.net/ark:/65665/ng49ca746a7-5991-704b-e053-15f76fa0b4fa
