The magician's own book, or The whole art of conjuring (1862)
Arnold, George, 1834-1865, Cahill, Frank · New York, Dick & Fitzgerald · leaf 278
iece equal to thatrepresenting the curved wall. You may then lay the curvedpiece upon the straight one, and reversing the experimentprove that the curved piece is capable of forming a rectan-gular piece equal to the other. TRLiNGULAR PROBLEM. Take four square pieces of pasteboard of the same… … colors, red, orange, yellow, green,blue, indigo, violet, and let theeighth be white. To find howmany chequers or regular four-sided figures, different either inform or color, may be made outof these eight triangles. First, by combining two of thesetriangles there may be formed,either the triangular…
Magic tricks
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