Object Details
- Kern & Co.
- Description
- This German silver semicircular protractor bears the distinctive italic engraved numbers of Kern & Co. of Aarau, Switzerland. It is graduated by quarter-degrees and marked by tens from 10 to 170 both from left to right and from right to left. There are no other marks. The lower edge of the protractor is beveled, with a groove at the origin point.
- Ruth E. Crownfield, the widow of Albert C. Crownfield Jr., a mechanical engineer from Mohawk, N.Y., donated this protractor in 1978. The instrument is quite tarnished and scratched, suggesting Crownfield used it frequently. Similar protractors cost $3.50 in the first decade of the 20th century and $4.50 in 1936.
- See also ID numbers MA.247966 and 1977.0460.02.
- References: “(Product No.) 1248,” Catalogue of Keuffel & Esser Co. (New York, 1909), 172; Catalogue of Keuffel & Esser Co. (New York, 1936), 201.
- Location
- Currently not on view
- Credit Line
- Gift of Ruth E. Crownfield
- early 20th century
- ID Number
- 1978.2291.01
- accession number
- 1978.2291
- catalog number
- 336875
- Object Name
- protractor
- Physical Description
- german silver (overall material)
- Measurements
- overall: .2 cm x 15.6 cm x 7.9 cm; 3/32 in x 6 5/32 in x 3 1/8 in
- place made
- Switzerland: Aargau, Aarau
- See more items in
- Medicine and Science: Mathematics
- Science & Mathematics
- Protractors
- National Museum of American History
- Subject
- Mathematics
- Protractor
- Record ID
- nmah_904460
- GUID (Link to Original Record)
- https://n2t.net/ark:/65665/ng49ca746a7-60ae-704b-e053-15f76fa0b4fa
