Darling, Brown & Sharpe Open Triangle
date: label: date made
content: 1866-1892
name: label: maker
content: Darling, Brown & Sharpe
notes: label: Description
content: This steel 45°-45°-90° triangle is 8" tall and has an open interior. A hole near one vertex is for hanging. The instrument is marked: Darling, Brown & Sharpe (/) Providence, R.I. The firm operated under that name from 1866 to 1892. (Compare to 1977.0460.08 and 1977.0460.09.) It advertised this triangle in 1868 for $4.50 and for $4.00 in 1887 and 1899 (when the company was known as Brown & Sharpe). In 1884 the Physical Laboratory of the University of California in Berkeley purchased a triangle of this type from Darling, Brown & Sharpe for $4.25.
label: Description
content: Erasmus Darwin Leavitt Jr. (1836–1916), the renowned American mechanical engineer and designer of steam engines, owned this triangle. It was donated to the Smithsonian by his granddaughter.
label: Description
content: References: Kenneth L. Cope, intro., <i>A Brown & Sharpe Catalogue Collection, 1868 to 1899 </i> (Mendham, N.J.: The Astragal Press, 1997), 14, 118, 157; "Disbursements," in <i>Annual Report of the Secretary to the Board of Regents of the University of California, for the Year Ending June 30, 1884</i> (Sacramento, 1884), 50.
label: Location
content: Currently not on view
place: label: place made
content: United States: Rhode Island, Providence
topic: label: Subject
content: Mathematics
label: Subject
content: Drafting, Engineering
label: Subject
content: Drawing Instruments
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Squares and Triangles
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content: Science & Mathematics
creditLine: label: Credit Line
content: Gift of Margaret van D. Rice
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1977.0460.10
label: catalog number
content: 336081
label: accession number
content: 1977.0460
objectType: label: Object Name
content: triangle
physicalDescription: label: Physical Description
content: steel (overall material)
label: Measurements
content: overall: 20.4 cm x 20.4 cm x 3/16 in; 8 1/32 in x 8 1/32 in x .508 cm