Keuffel & Esser 1855 8" Drafting Triangle

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This 7-3/4" 30°-60°-90° yellowed plastic triangle was originally transparent and 8" tall. Like many plastic objects from the early 20th century, it is rapidly deteriorating. A small triangular hole in the interior has notches or bevels around its edges. The object is marked along the short edge: KEUFFEL & ESSER Co. (/) N. Y.; 8; TRADE MARK (below the K&E eagle logo). By 1909 K&E offered xylonite triangles for use in engineering drawing; the 8-inch size sold for 55¢. By 1936 the price was 50¢. The Department of Mathematics at Brown University gave this object to the Museum in 1973.
References: Catalogue and Price List of Keuffel & Esser Co., 33rd ed. (New York, 1909), 208; Catalogue of Keuffel & Esser Co., 38th ed. (New York, 1936), 229.
Currently not on view
date made
early 20th century
place made
United States: New York, New York
Physical Description
plastic (overall material)
overall: 11.6 cm x 19.5 cm x .1 cm; 4 9/16 in x 7 11/16 in x 1/32 in
ID Number
catalog number
accession number
Credit Line
Gift of Brown University Department of Mathematics
Drawing Instruments
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Squares and Triangles
Data Source
National Museum of American History


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