Geometric Model by A. Harry Wheeler, Trihedral Angles
In this cut and glued plastic model, a transparent tetrahedron has isosceles triangles for side faces. Inside it is a transparent triangle with edges on three faces. 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.
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.
unspecified: Wheeler, Albert Harry
maker: Wheeler, Albert Harry
ID Number: MA.304723.714
accession number: 304723
catalog number: 304723.714
Physical Description: plastic (overall material)
Physical Description: green (overall color)
Physical Description: cut and glued (overall production method/technique)
Measurements: average spatial: 7 cm x 7.5 cm x 4.5 cm; 2 3/4 in x 2 15/16 in x 1 25/32 in
See more items in: Medicine and Science: Mathematics
See more items in: Science & Mathematics
Credit Line: Gift of Helen M. Wheeler
place made: United States: Massachusetts, Worcester
associated place: United States: Massachusetts, Worcester