Drafting Triangle

Drafting Triangle

<< >>
Usage conditions apply
Downloads
Description
This unmarked 5-1/2" wooden right triangle has angles of about 30° and 60°. The corners of the instrument have broken off, and some drawing triangles were neither 30°-60°-90° nor 45°-45°-90°, so it is not possible to know the original dimensions of the object. (For triangles with other angle measurements, see 1990.0690.01 and MA.323412.) Users held the object in place by putting their thumbs in an 11/16" circle cut from the center. Compare to 1979.0876.02, 1983.0238.01, and MA.304826.137.
The dating of other objects from this donor suggests the triangle was made around 1900. The Eugene Dietzgen Company sold a 5-3/4" 30°-60°-90° cherry triangle for 8¢ in 1904, while Keuffel & Esser offered a triangle with the same dimensions but in pearwood for 10¢ in 1909.
References: Catalog of Eugene Dietzgen Co., 7th ed. (Chicago, 1904), 194; Catalogue and Price List of Keuffel & Esser Co., 33rd ed. (New York, 1909), 223.
Location
Currently not on view
Object Name
triangle
date made
ca 1900
Physical Description
wood (overall material)
Measurements
overall: 7.9 cm x 13.9 cm x.3 cm; 3 1/8 in x 5 15/32 in x 1/8 in
ID Number
MA.335331
catalog number
335331
accession number
305958
Credit Line
Gift of Eunice L. Hoffman
subject
Mathematics
Drawing Instruments
See more items in
Medicine and Science: Mathematics
Squares and Triangles
Science & Mathematics
Data Source
National Museum of American History
Nominate this object for photography.   

Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.

If you would like to know how you can use content on this page, see the Smithsonian's Terms of Use. If you need to request an image for publication or other use, please visit Rights and Reproductions.

Note: Comment submission is temporarily unavailable while we make improvements to the site. We apologize for the interruption. If you have a question relating to the museum's collections, please first check our Collections FAQ. If you require a personal response, please use our Contact page.