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In 1985, Bill Cutler found a level-5 burr [14] and shortly afterwards a level-7 burr was found by the Israeli Philippe Dubois. [13] In 1990, Cutler completed the final part of his analysis and found that the highest possible level using notchable pieces is 5, and 139 of those puzzles exist. The highest level possible for a six-piece burr with ...
Pentangle's first product was a burr puzzle, the Woodchuck puzzle, whose object was to assemble 24 wooden pieces into an octahedral shape. It sold hundreds of thousands of these. [ 1 ] Pentangle eventually made a total of 314 different burr puzzles, and from 1979 made and sold the "Chinese Cross", a compendium of 42 pieces including all the ...
A holey burr puzzle is characterised by internal holes, which usually allow for sliding movements of individual pieces or groups of pieces. The level of a holey burr puzzle specifies how many sliding movements are necessary to assemble or disassemble the puzzle. Commercial Name: Minus Cube Piece configuration: 2×2×2-1 sliding cubes
Liberty Puzzles was founded in 2005 by Christopher Wirth and his business partner Jeffrey Eldridge, after Wirth’s family inherited several hand-cut wooden puzzles from the 1930s. [1] Surprised by the value of hand-cut wooden jigsaw puzzles (which can sell for more than $1,000 each), Wirth decided to start a business using modern cutting ...
The Universal Book of Mathematics provides the following information about Altekruse puzzle: [2] [3] A symmetrical 12-piece burr puzzle for which a patent was granted to William Altekruse in 1890. The Altekruse family is of Austrian-German origin and, curiously, the name means "old cross" in German, which has led some authors to incorrectly ...
Stave Puzzles is an American jigsaw puzzle company located in Norwich, Vermont. The company was started in 1974 by Steve Richardson and Dave Tibbetts and was called Stave—a portmanteau of their first names. [1] They manufacture hand cut jigsaw puzzles made from cherry-backed, 5-layered, 1 ⁄ 4-inch (6.4 mm) wood. Stave produces several ...
A pyramid puzzle consists of two or more component pieces which fit together to create a pyramid. [1] [2] Two-piece pyramid puzzles cannot form a regular pyramid and can only form a 4 faced tetrahedron pyramid. The solution involves facing the square faces to each other and twisting one upright to complete the four faced tetrahedronic pyramid. [3]
A plate-and-ring puzzle usually consists of three pieces: one plate or similar displaying many holes and/or indentations; a closed or nearly closed ring or a similar item. The plate as well as the ring are usually made from metal. The ring has to be disentangled from the plate. [12]
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