Geometrical instruments – Straightedge type – Rules
Patent
1993-07-19
1996-05-28
Fulton, Christopher W.
Geometrical instruments
Straightedge type
Rules
33476, 33759, G01B 302
Patent
active
055199437
ABSTRACT:
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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patent: 2389369 (1945-11-01), Kittleson
patent: 4155165 (1979-05-01), Gillingwater
patent: 4204335 (1980-05-01), Grossman et al.
patent: 5230158 (1993-07-01), Wall
patent: 5251382 (1993-10-01), Hellar
Engineering Drawing, 1958, McGraw-Hill Book Company, pp. 72-74.
Engineering Drawing and Graphic Technology, French et al., 1972, McGraw-Hill, Inc. pp. 24-25, 73-74.
Flanagan John R.
Fulton Christopher W.
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