Object Details
maker
Baker, Richard P.
Description
A twisted polygon is a closed broken line whose sides do not all lie in the same plane. This model shows a few sides of such a polygon, namely the edges ABCDE. All lie on a double cone, which also is shown. The sides BC and CD lie in one plane, which is represented by a large circle that intersects the cone. The sides CD and DE lie in a second plane, represented by another large circle. The sides AB and BC lie in a third plane, represented by a quadrilateral tangent to the cone. A plane perpendicular to CD at its midpoint also is represented by a circular wedge. Baker described this model as showing “osculating planes and cone with center of spherical curvature.”
The model sold for $2.50.
References:
R. P. Baker, Mathematical Models, Iowa City, Iowa, 1931, p. 11.
Richard P. Baker Papers, University Archives, University of Iowa, Iowa City, Iowa.
Location
Currently not on view
Credit Line
Gift of Frances E. Baker
date made
ca 1906-1935
ID Number
MA.211257.020
accession number
211257
catalog number
211257.020
Object Name
geometric model
Physical Description
metal (overall material)
white (overall color)
soldered (overall production method/technique)
Measurements
average spatial: 17.8 cm x 21.6 cm x 13.8 cm; 7 in x 8 1/2 in x 5 7/16 in
place made
Iraq
United States: Iowa, Iowa
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Data Source
National Museum of American History
Subject
Mathematics
Link to Original Record
Record ID
nmah_1080279