Model of a Twisted Polygon by Richard P. Baker, Baker #135
date: label: date made
content: ca 1906-1935
name: label: maker
content: Baker, Richard P.
notes: label: Description
content: A twisted polygon is a closed broken line whose sides do not all lie in the same plane. This model shows four edges of such a polygon. For the three edges in the center of the model, a line segment perpendicular to two adjacent edges is indicated (these are binormals of the polygon at the point). The back of the model contains three quadrilaterals that contain two adjacent edges of the twisted polygon (that is to say, that represent part of three osculating planes of the polygon). It also contains two triangles representing planes normal to edges of the polygon at their midpoints (representing normal planes).
label: Description
content: According to Baker’s catalog description, the model represented “osculating, normal and rectifying planes, rectifying lines” for a twisted polygon. The model sold for $2.00.
label: Description
content: The model is presently in two pieces.
label: Description
content: References:
label: Description
content: R. P. Baker, <I>Mathematical Models</I>, Iowa City, Iowa, 1931, p. 11.
label: Description
content: Richard P. Baker Papers, University Archives, University of Iowa, Iowa City, Iowa.
label: Location
content: Currently not on view
place: label: place made
content: Iraq
topic: label: Subject
content: Mathematics
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Science & Mathematics
creditLine: label: Credit Line
content: Gift of Frances E. Baker
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MA.211257.022
label: accession number
content: 211257
label: catalog number
content: 211257.022
objectType: label: Object Name
content: geometric model
label: Other Terms
content: Osculating Planes and Cone with Center of Spherical Curvature.
physicalDescription: label: Physical Description
content: metal (overall material)
label: Physical Description
content: white (overall color)
label: Physical Description
content: black (overall color)
label: Physical Description
content: bent and soldered (overall production method/technique)
label: Measurements
content: average spatial: 8.6 cm x 20.3 cm x 10.6 cm; 3 3/8 in x 8 in x 4 3/16 in