Keuffel & Esser Triangle for Roof Pitches
date: label: date made
content: 1880-1906
name: label: maker
content: Keuffel & Esser Co.
notes: label: Description
content: This 4" 45°-45°-90° triangle is made of hard black rubber. One edge is marked: KEUFFEL & ESSER (/) N.Y.; TRADE MARK (below the K&E eagle logo). The hypotenuse is marked: 1/2 PITCH. At least as early as 1880, K&E sold this object as part of a set of six hard rubber triangles with various angle sizes. The triangles were used for depicting roof pitches in architectural drawings. In 1890 and 1892 the set sold for $3.00 as model number 1805. By 1906 the set was made of transparent xylonite (plastic).
label: Description
content: The triangle was found in the NMAH Physical Sciences collections in 1979 with objects that suggest an association with Cleveland Abbe (1838–1916), an American engineer, astronomer, and meteorologist who worked for the U.S. Weather Service from 1871 until shortly before his death.
label: Description
content: References: <i>Catalogue of Keuffel & Esser Co.</i>, 13th ed. (New York, 1880), 131; <i>Catalogue of Keuffel & Esser Co.</i>, 21st ed. (New York, 1890), 135; <i>Catalogue of Keuffel & Esser Co.</i>, 23rd ed. (New York, 1892), 135; <i>Catalogue of Keuffel & Esser Co.</i>, 32nd ed. (New York, 1906), 223; accession file.
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: Architecture
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
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1979.0876.03
label: catalog number
content: 1979.0876.03
label: accession number
content: 1979.0876
objectType: label: Object Name
content: triangle
physicalDescription: label: Physical Description
content: rubber (overall material)
label: Measurements
content: overall: 10 cm x 10 cm x .1 cm; 3 15/16 in x 3 15/16 in x 1/32 in