

Lituus 
  According to Robert C. Yates 1952, the Lituus curve is studied by Roger Cotes in 1722. 
  Lituus is a spiral described by the polar equation r == 1/Sqrt[θ]. 
  That is, suppose P is a point on the curve, and X a point on the asymptote OP distance from the origin O. Suppose the area of the circular sector OPX is A. As P moves towards the center on the curve, the area remains the same. 
 xahlee.org /SpecialPlaneCurves_dir/Lituus_dir/lituus.html (0 words) 
