Geometric Model by A. Harry Wheeler, Trihedral Angles


In this cut and glued plastic model, a transparent tetrahedron (lacking a base) has equilateral triangles for side faces. Inside it is a white triangle with edges on two faces (and a third edge where the base would be). George Wentworth used two such figures in a diagram in a theorem defining two equal trihedral angles in terms of the face angles on the faces surrounding the trihedral angle. A tag on the model reads: 2TRIA. Another tag reads: A. Harry Wheeler.

For a related pattern, dated February 2, 1945, see 1979.0102.109.

Compare 1979.0102.206 and 1979.0102.207.


George A. Wentworth (with David Eugene Smith), Plane and Solid Geometry, Boston: Ginn and Company, 1913, pp. 312-313.

Maker: Wheeler, Albert Harry

Location: Currently not on view

Place Made: United States: Massachusetts, Worcester

Subject: Mathematics


See more items in: Medicine and Science: Mathematics, Science & Mathematics


Exhibition Location:

Credit Line: Gift of Helen M. Wheeler

Data Source: National Museum of American History

Id Number: MA.304723.713Accession Number: 304723Catalog Number: 304723.713

Object Name: Geometric Model

Physical Description: plastic (overall material)green (overall color)white (overall color)cut and glued (overall production method/technique)Measurements: average spatial: 6.6 cm x 5.7 cm x 6.2 cm; 2 19/32 in x 2 1/4 in x 2 7/16 in


Record Id: nmah_1073521

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