Keuffel & Esser 1802 12" Drafting Triangle
date: label: date made
content: ca 1890-1918
name: label: Maker
content: Keuffel & Esser Co.
notes: label: Description
content: This 12" 30°-60°-90° hard rubber triangle has a small triangular opening in the interior. On one side, the short side is marked: KEUFFEL & ESSER CO. (/) NEW YORK (/) AND (/) CHICAGO; 12. K&E's eagle trademark is to the right of the number 12, above the word TRADEMARK. On the other side, the short side is marked: S. T. [in script] (/) A. R. O. That side also has three concentric circles near the hypotenuse of the opening.
label: Description
content: By 1890 Keuffel & Esser was making the shape of the hole in its hard rubber triangles triangular instead of circular. The 12-inch size of model number 1802 sold for 90¢ from 1890 to 1909 and for 75¢ in 1913. By 1921 the firm no longer offered hard rubber triangles, perhaps due to shortages of the material during World War I as well as improvements in the manufacture of plastic. The mark suggests that the object's date can be narrowed to 1892–1894, since that was the period when Chicago was K&E's only branch office.
label: Description
content: References: <i>Catalogue of Keuffel & Esser Co.</i>, 21st ed. (New York, 1890), 135; <i>Catalogue of Keuffel & Esser Co.</i>, 33rd ed. (New York, 1909), 202; <i>Catalogue of Keuffel & Esser Co.</i>, 34th ed. (New York, 1913), 200; Hoboken Historical Museum, "Triangle: pearwood framed drawing, [group of] 3," http://hoboken.pastperfect-online.com/32340cgi/mweb.exe?request=record;id=5D8ED8D1-A698-42D7-AA97-396737757553;type=101.
label: Location
content: Currently not on view
place: label: place made
content: United States: New York, New York City
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 Danny Morris
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MA.333826
label: catalog number
content: 333826
label: accession number
content: 304759
objectType: label: Object Name
content: triangle
physicalDescription: label: Physical Description
content: rubber (overall material)
label: Measurements
content: overall: 7.5 cm x 30.5 cm x .2 cm; 2 15/16 in x 12 in x 3/32 in