Plane and solid analytic geometry; an elementary textbook (1905)
Ashton, Charles H. (Charles Hamilton), 1866- · New York, C. Scribner's Sons · leaf 223
to somedefinite law, is called a spiral. The fixed point is called 200 ANALYTIC GEOMETRY [Ch. XV, § 110 the centre, and the curve traced daring one revolutionis called a spire. If any two radii vectores have tlie same ratio as theangles they make with the initial line, the equation ofthe spiral is… … P = d^ P he, p^ = Fig. 108. The curve wdiose equation islog p = k6^ or p = a^ is calledthe logarithmic spiral. When^ z= 0, p = 1. For increasingpositive values of 0, p increasesvery rapidly; while for decreas-ing negative values of ^, p decreases more and moreslowly, and approaches zero as a limit.…
Geometry, Analytic
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