| 摘要 |
A method and apparatus to aid a craftsman in producing an eight-sided geometrical object, preferably an octagon, from a square object or rectangular object. The apparatus of the invention comprises a rule with a first edge and a first scale along the first edge, and a second edge and a second scale along the second edge. The second scale is preferably fractionally proportionate to the first scale by a factor of about 29.289322 percent. The first scale may be any standard measuring scale such as inches or centimeters. The method of the invention comprises measuring a length of the square with the first scale, using the second scale for easily measuring and marking a plurality of points on the square, and drawing a plurality of lines between the points for marking portions of the square which are to be cut off in producing an octagon or other geometrical object.
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