Drawing Equiangular or Logarithmic Spiral

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“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




Anthony, Gardner C. Elements of Mechanical Drawing (Boston, MA: D. C. Heath & Co., 1904)


TIFF (full resolution)

2400×1823, 279.2 KiB

Large GIF

1024×777, 47.1 KiB

Medium GIF

640×486, 26.5 KiB

Small GIF

320×243, 11.1 KiB