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[5] [17] Another example is the wooden version of the puzzle produced by Drueke & Sons, under the name "Pa's T puzzle", dated around the 1940s and here depicted to the right. [18] Later also versions were produced with plastic pieces, such as "Adams T puzzle" by S.S. Adams Co in the 1950s' [ 18 ] [ 19 ] [ 20 ] and "The famous T puzzle" by Marx ...
The origin of the English word 'tangram' is unclear. One conjecture holds that it is a compound of the Greek element '-gram' derived from γράμμα ('written character, letter, that which is drawn') with the 'tan-' element being variously conjectured to be Chinese t'an 'to extend' or Cantonese t'ang 'Chinese'. [5]
However, the blue triangle has a ratio of 5:2 (=2.5), while the red triangle has the ratio 8:3 (≈2.667), so the apparent combined hypotenuse in each figure is actually bent. With the bent hypotenuse, the first figure actually occupies a combined 32 units, while the second figure occupies 33, including the "missing" square.
The goal is to remove the two rings. (solution shown). Wire-and-string puzzles usually consist of: one piece of string, ribbon or similar, which may form a closed loop or which may have other pieces like balls fixed to its end. one or several pieces of stiff wire; sometimes additional pieces like wooden ball through which the string is threaded.
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An unpublished study from 1989 on a generalized version of the game on the English board showed that each possible problem in the generalized game has 2 9 possible distinct solutions, excluding symmetries, as the English board contains 9 distinct 3×3 sub-squares. One consequence of this analysis is to put a lower bound on the size of possible ...
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One game—lacking the 5 × 4 design of Pennant, Klotski, and Chinese models but a likely inspiration—is the 19th century 15-puzzle, where fifteen wooden squares had to be rearranged. It is suggested that unless a 19th-century Asian evidence is found, the most reasonably likely path of transmission is from the late 19th century square designs ...