Drafting Triangle

There are restrictions for re-using this image. For more information, visit the Smithsonian's Terms of Use page .
International media Interoperability Framework
IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more.
View manifest View in Mirador Viewer
Description:

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.

Date Made: ca 1900

Location: Currently not on view

Subject: MathematicsDrawing Instruments

Subject:

See more items in: Medicine and Science: Mathematics, Squares and Triangles, Science & Mathematics

Exhibition:

Exhibition Location:

Credit Line: Gift of Brown University Department of Mathematics

Data Source: National Museum of American History

Id Number: MA.304722.09Catalog Number: 304722.09Accession Number: 304722

Object Name: triangle

Physical Description: wood (overall material)Measurements: overall: 6.6 cm x 14 cm x .1 cm; 2 19/32 in x 5 1/2 in x 1/32 in

Metadata Usage: CC0

Guid: http://n2t.net/ark:/65665/ng49ca746a7-4751-704b-e053-15f76fa0b4fa

Record Id: nmah_904225

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.