Drawing Equiangular or Logarithmic Spiral Small 320×243 Medium 640×486 Large 1024×778 Download Tiff Original 2400×1823 | (279.2 KB) 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 Keywords Drawing Equiangular or Logarithmic Spiral, Equiangular Spiral, Log Spiral, logarithmic spiral, spiral, spirals Galleries Spirals Source: Anthony, Gardner C. Elements of Mechanical Drawing (Boston, MA: D. C. Heath & Co., 1904)
