6.AP . DISSECTIONS OF A TETRAHEDRON
6.AP.1. TWO PIECES
Richard A. Proctor. Our puzzles; Knowledge 10 (Feb 1887) 83 & Solutions of puzzles; Knowledge 10 (Mar 1887) 108-109. "Puzzle XIX. Show how to cut a regular tetrahedron (equilateral triangular pyramid) so that the face cut shall be a square: also show how to plug a square hole with a tetrahedron." Solution shows the cut clearly.
Edward T. Johnson. US Patent 2,216,915 -- Puzzle. Applied: 26 Apr 1939; patented: 8 Oct 1940. 2pp + 1p diagrams. Described in S&B, p. 46.
E. M. Wyatt. Wonders in Wood. Op. cit. in 6.AI. 1946. Pp. 9 & 11: the tetrahedron or triangular pyramid. P. 9 is reproduced in S&B, p. 46.
Donovan A. Johnson. Paper Folding for the Mathematics Class. NCTM, 1957, p. 26, section 62: Pyramid puzzle. Gives instructions for making the pieces from paper.
Claude Birtwistle. Editor's footnote. MTg 21 (Winter 1962) 32. "The following interesting puzzle was given to us recently."
Birtwistle. Math. Puzzles & Perplexities. 1971. Bisected tetrahedron, pp. 157-158. Gives the net so one can make a drawing, cut it out and fold it up to make one piece.
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