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Drawing Equiangular or Logarithmic Spiral
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Description: "If B and C are points in the spiral and the ratio of AC to AB be given, the intermediate point D may be obtained by describing a semicircle on BC as a diameter and erecting a perpendicular at A." —Anthony, 1904
Source: Anthony, Gardner C. Elements of Mechanical Drawing (Boston: D. C. Heath & Co., 1904) 103
Keywords: Drawing Equiangular or Logarithmic Spiral, Equiangular Spiral, Log Spiral, Logarithmic Spiral, spiral, spirals
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