Open Triangle


This 7" 45°-45°-90° triangle with an open interior is made of two different woods, with a section of reddish wood set between two sections of darker wood. A small triangle is etched in one leg. The object has a sticker marked: 365.

James W. Queen of Philadelphia sold a similar ebony or maple triangle with a mahogany inlay, but only in a 7-1/2" size. The previous owner of this instrument collected more than 1,200 hand tools and machine tools and displayed them at his family's building company in Baltimore, Md. This object was item number 365 in his collection.

Reference: James W. Queen & Co., Priced and Illustrated Catalogue of Mathematical Instruments (Philadelphia, 1883), 51.

Date Made: ca 1900

Location: Currently not on view

Subject: MathematicsDrawing Instruments


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


Exhibition Location:

Credit Line: The John R. Gerwig, Jr., Collection

Data Source: National Museum of American History

Id Number: 1977.1101.0088Catalog Number: 1977.1101.0088Accession Number: 1977.1101

Object Name: triangle

Physical Description: wood (overall material)Measurements: overall: 17.7 cm x 17.7 cm x .3 cm; 6 31/32 in x 6 31/32 in x 1/8 in


Record Id: nmah_689855

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