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An assembled six-piece burr. The six-piece burr, also called "Puzzle Knot" or "Chinese Cross", is the most well-known and presumably the oldest of the burr puzzles. This is actually a family of puzzles, all sharing the same finished shape and basic shape of the pieces. The earliest US patent for a puzzle of this kind dates back to 1917. [8]
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 ...
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 ...
A combination puzzle, also known as a sequential move puzzle, is a puzzle which consists of a set of pieces which can be manipulated into different combinations by a group of operations. Many such puzzles are mechanical puzzles of polyhedral shape , consisting of multiple layers of pieces along each axis which can rotate independently of each ...
A solution to Hoffman's packing puzzle with 4×5×6 cuboids (1), exploded to show each layer (2) The image shows an example of Hoffman's packing puzzle . The aim is to pack 27 cuboids with side lengths A , B , C {\displaystyle A,B,C} into a box of side length A + B + C {\displaystyle A+B+C} , subject to two constraints:
The Mansfield school district said Thursday that it was not able to verify whether a candidate on the May 5 ballot is eligible for school board. In a statement, the district said it was ...
The candidate who has been declared ineligible for the Mansfield school board election is looking toward a potential special election, according to one of his social media posts.
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