Drafting Triangle
date: label: date made
content: ca 1900
notes: label: Description
content: This 5-1/2" 20°-70°-90° wooden triangle has a 3/8" round hole at the center for positioning and holding the instrument. Compare to 304826.137, 335331, and 1979.0876.02. A previous user has written the numbers 20, 70, and 90 at the appropriate corners. For other drawing triangles with unusual angle measurements, see 334622 and 1990.0690.01. The Department of Mathematics at Brown University gave this object to the Museum in 1973.
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 Brown University Department of Mathematics
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MA.304722.09
label: catalog number
content: 304722.09
label: accession number
content: 304722
objectType: label: Object Name
content: triangle
physicalDescription: label: Physical Description
content: wood (overall material)
label: Measurements
content: overall: 6.6 cm x 14 cm x .1 cm; 2 19/32 in x 5 1/2 in x 1/32 in