Open Triangle

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Description
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.
Location
Currently not on view
date made
ca 1900
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
ID Number
1977.1101.0088
catalog number
1977.1101.0088
accession number
1977.1101
Credit Line
The John R. Gerwig, Jr., Collection
subject
Mathematics
Drawing Instruments
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Squares and Triangles
Data Source
National Museum of American History, Kenneth E. Behring Center

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