Model of the Locus of Spherical Curvature of a Screw by Richard P. Baker, Baker #134 (a Ruled Surface)

Model of the Locus of Spherical Curvature of a Screw by Richard P. Baker, Baker #134 (a Ruled Surface)

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This string model was constructed by Richard P. Baker after he joined the mathematics faculty at the University of Iowa in 1905. Baker believed that models were essential for the teaching of many parts of mathematics and physics, and over one hundred of his models are in the museum collections.
The typed part of a paper label on the top of the wooden base of this model reads: No. 134 (/) Screw: locus of spherical (/) curvature. Model 134 is listed in Baker’s 1931 catalog as a model for differential geometry with the title shown. No dimensions are given.
The planes, line segments, cone, cylinder and helix shown in this model are identical to those of Baker’s model 89 (MA.211257.012), although the color of the thread is different.
The model reportedly sold for $5.00.
R. P. Baker, Mathematical Models, Iowa City, Iowa, 1931, p. 11.
R. P. Baker Papers, University of Iowa, Iowa City, Iowa.
Currently not on view
Object Name
geometric model
date made
ca 1906-1935
Baker, Richard P.
place made
United States: Iowa, Iowa
Physical Description
thread (overall material)
wood (overall material)
metal (overall material)
black (overall color)
red (overall color)
yellow (overall color)
blue (overall color)
screwed, soldered & threaded (overall production method/technique)
average spatial: 13.4 cm x 26 cm x 18.4 cm; 5 9/32 in x 10 1/4 in x 7 1/4 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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