Irregular or French Curve

Description
This flat wooden drawing instrument has curves on the outside and in an inner opening. It also has two small holes.
The previous owner of this object collected more than twelve hundred hand and machine tools, displaying them at his family's building company in Baltimore, Md. This device came in a tool chest along with several others.
The shape of the curve (though not the holes) is similar to an instrument shown in a Reeves & Sons catalog from 1904. It also resembles one shown in Wallis and in McAllister as early as 1881 (there with one small hole). Hence the very rough date assigned.
Compare 1977.1101.0095.
References:
Maya Hambly, Drawing Instruments, London: RIBA Drawings Collection, 1982, p. 32.
Accession File.
Roland S. Wallis, Industrial Education Notes on Mechanical Drawing, Ames, Iowa: Engineering Extension Department Iowa State College, 1922, p. 15.
William Y. McAllister, Priced and Illustrated catalogue..., Philadelphia, 1881, pp. 43-44.
Location
Currently not on view
date made
1890-1920
1880-1920
Physical Description
wood (overall material)
Measurements
overall: .2 cm x 21.3 cm x 7.4 cm; 3/32 in x 8 3/8 in x 2 29/32 in
ID Number
1977.1101.0096
accession number
1977.1101
catalog number
1977.1101.0096
Credit Line
The John R. Gerwig, Jr., Collection
subject
Mathematics
Drawing Instruments
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Curves
Data Source
National Museum of American History, Kenneth E. Behring Center

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