Model of a Twisted Polygon by Richard P. Baker, Baker #131

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A twisted polygon is a closed broken line whose sides do not all lie in the same plane. This model of such a figure is made from painted 1/8 inch steel wire. The range is over a quarter of a circle. According to Baker’s catalog description, the model includes “osculating and normal planes and polar lines in penultimate position.” The penultimate position is the one next to the rightmost in the image, the osculating plane is represented by two short wires, and the normal plane at this point is indicated by lower wires approaching the pole at the back.
A paper tag reads: No. 131 (/) Twisted polygon: diff. geom.
The model sold for $2.50.
R. P. Baker, Mathematical Models, Iowa City, Iowa, 1931, p. 11.
Richard P. Baker Papers, University Archives, University of Iowa, Iowa City, Iowa.
Currently not on view
date made
ca 1906-1935
Baker, Richard P.
Physical Description
metal (overall material)
white (overall color)
soldered (overall production method/technique)
average spatial: 6.2 cm x 21.2 cm x 15 cm; 2 7/16 in x 8 11/32 in x 5 29/32 in
ID Number
accession number
catalog number
Credit Line
Gift of Frances E. Baker
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Data Source
National Museum of American History


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