Object Details
- Description
- This semicircular brass protractor is divided by single degrees and marked by tens from 10° to 170° in both the clockwise and counterclockwise directions. The origin point is marked with an arrow. A 2-1/2 inch ruler, divided by sixteenths of an inch, runs along the lower edge of the protractor. The letters U.S.A. are engraved above the right end of the ruler. No maker's mark is present.
- Location
- Currently not on view
- Credit Line
- Gift of William J. Ellenberger
- ca 1930
- ID Number
- 1981.0933.19
- accession number
- 1981.0933
- catalog number
- 1981.0933.19
- Object Name
- protractor
- Other Terms
- protractor; Semi-Circular
- Physical Description
- brass (overall material)
- Measurements
- overall: .1 cm x 9.5 cm x 4.5 cm; 1/32 in x 3 3/4 in x 1 25/32 in
- See more items in
- Medicine and Science: Mathematics
- Science & Mathematics
- Protractors
- National Museum of American History
- Subject
- Mathematics
- Protractor
- Record ID
- nmah_904378
- GUID (Link to Original Record)
- https://n2t.net/ark:/65665/ng49ca746a7-598f-704b-e053-15f76fa0b4fa
