Geometric Model by A. Harry Wheeler, Square Transformable into an Equilateral Triangle, Plane Dissection

Geometric Model by A. Harry Wheeler, Square Transformable into an Equilateral Triangle, Plane Dissection

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Usage conditions apply
These four hinged pieces may be arranged a an equilateral triangle or a square.
Compare MA.304723.764, MA.304723.819, MA.304723.766, and MA.304723.823.
This is similar but not identical to Wheeler's Model 4ST. Two drawings for that puzzle, both dated January 17, 1932 and April 26, 1932, are in 1979.3002.43, folder 1. The drawings refers to the Mathematical Gazette - no volume or page is given. A drawing in 1979.3002.53 dated January 5, 193? refers to this model as 4C.
Fredrickson, Greg N., Dissections Plane and Fancy, pp. 136-137 attributes publication of this dissection to Dudeney (1902).
H. E. Dudeney, The Canterbury Puzzles, pp. 49-50, 178-180. Dudeney specifically points out on p.180 that the puzzle may be made with the pieces hinged. The first edition of the book appeared in 1907, the second in 1919.
Currently not on view
Object Name
geometric model
date made
ca 1932.
Wheeler, Albert Harry
place made
United States: Massachusetts, Worcester
Physical Description
plastic (overall material)
wood (overall material)
metal (overall material)
turquoise (overall color)
red (overall color)
yellow (overall color)
black (overall color)
cut, glued and hinged (overall production method/technique)
average spatial: 1.1 cm x 13.2 cm x 20.2 cm; 7/16 in x 5 3/16 in x 7 15/16 in
ID Number
accession number
catalog number
Credit Line
Gift of Helen M. Wheeler
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Plane Dissections
Data Source
National Museum of American History
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