Drafting Triangle
date: label: date made
content: late 19th century
notes: label: Description
content: This 6-1/4" 30°-60°-90° wooden triangle has a 1-1/8" round hole at the center for positioning and holding the instrument. The hole is larger than those in 1979.0876.02 and MA.335331. Cursive initials "D. D." are engraved near the 60° angle.
label: Description
content: The donors' family was prominent in the history of American science. John William Draper (1811–1882) was a chemist who also made innovations in photography. He had three sons: John C. Draper (1835–1885), who was a physician and chemist; Henry Draper (1837–1882), who was an astronomical photographer; and Daniel Draper (1841–1931), who established the New York Meteorological Observatory in Central Park in 1868 and directed it until 1911. The initials on the object suggest Daniel owned the triangle.
label: Description
content: References: Maya Hambly, <i>Drawing Instruments, 1580–1980</i> (London: Sotheby's Publications, 1988), 108–109; Robert S. Harding and Jeffrey L. Tate, "Draper Family Collection, ca. 1826–1936," Archives Center, National Museum of American History, http://amhistory.si.edu/archives/d8121.htm.
label: Location
content: Currently not on view
topic: label: Subject
content: Mathematics
label: Subject
content: Drawing Instruments
setName: label: See more items in
content: Medicine and Science: Mathematics
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content: Squares and Triangles
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content: Science & Mathematics
creditLine: label: Credit Line
content: Gift of John William Christopher Draper and James Christopher Draper
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MA.304826.137
label: catalog number
content: 304826.137
label: accession number
content: 304826
objectType: label: Object Name
content: triangle
physicalDescription: label: Physical Description
content: wood (overall material)
label: Measurements
content: overall: 9.2 cm x 15.7 cm x .3 cm; 3 5/8 in x 6 3/16 in x 1/8 in