Object Details
- Felsenthal Instrument Co.
- Description
- This clear plastic circular protractor is divided by tenths and marked by ones from 1 to 63. In the 48-64 quadrant, it is also marked in red print by ones from 32 to 17. The scale is labeled: AZIMUTH-MILS (100). The interior of the 16–32 quadrant is cut out. Each of the straight sides bears a scale divided by fifties and marked by thousands from 0 to 4,000. The scales are labeled: METERS RF 1: 50,000.
- An arm extending from the 0-16 quadrant is divided by tenths and marked by ones from 1 to 17. The scale is labeled: RANGE METERS (1000). The interior of the 32–48 quadrant bears a maker's mark: FELSENTHAL INSTRUMENTS CO. (/) MFR'S CODE 22040 (/) MFR'S PART NO. FAE-28. The protractor was used to predict the direction and distance of artillery rounds. Donor Ben Rau wrote "Massengale" (which may refer to a particular U.S. Army officer) on the tag he provided with this instrument, and he dated the object to 1966.
- See also 1977.1141.01, 1977.1141.02, 1977.1141.03, 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, 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
- 1966
- ID Number
- 1977.1141.05
- accession number
- 1977.1141
- catalog number
- 336389
- Object Name
- protractor
- Physical Description
- plastic (overall material)
- Measurements
- overall: .2 cm x 47 cm x 21.5 cm; 3/32 in x 18 1/2 in x 8 15/32 in
- place made
- United States: Illinois, Chicago
- See more items in
- Medicine and Science: Mathematics
- Science & Mathematics
- Protractors
- National Museum of American History
- Subject
- Mathematics
- Protractor
- Artillery
- Record ID
- nmah_904364
- GUID (Link to Original Record)
- https://n2t.net/ark:/65665/ng49ca746a7-30ce-704b-e053-15f76fa0b4fa
