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Geometric Model by A. Harry Wheeler, Congruent, Symmetric Spherical Traingles

Geometric Model by A. Harry Wheeler, Congruent, Symmetric Spherical Traingles

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This cut and glued transparent plastic model shows two perpendicular spherical discs which might be considered to be representations of the equator and a meridian disc of a sphere. Another half-disc also is perpendicular to the equator and rotates on the line joining the poles. Two symmetric congruent spherical triangles are on the same side of the model as the half-disc and pass through what might be considered the North Pole. A sticker on the model reads: C, S, SA. A mark next to the reads: PT.
For the pattern for this model, see 1979.3002.084. It is dated 1943.
Currently not on view
Object Name
Geometric Model
date made
A. Harry Wheeler
place made
United States: Massachusetts, Worcester
Physical Description
plastic (overall material)
overall: 7.7 cm x 7.7 cm x 7.7 cm; 3 1/32 in x 3 1/32 in x 3 1/32 in
ID Number
accession number
catalog number
Credit Line
Gift of Louise D. Campbell
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Spherical Trigonometry
Data Source
National Museum of American History
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