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

Keywords

spirals, spiral, logarithmic spiral, Equiangular Spiral, Log Spiral, Drawing Equiangular or Logarithmic Spiral

Galleries

Spirals

Source

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

Downloads

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