title: [Isaac Newton's Anguli Contactus method].
abstract: In this paper we discuss the geometrical method for calculating the curvature of a class of curves from the third Book of Isaac Newton's Principia. The method involves any curve which is generated from an elementary curve (actually from any curve whose curvature we known of) by means of transformation increasing the polar angular coordinate in a constant ratio, but unchanging the polar radial angular coordinate.
authors.forename: Jarosław
authors.initials: J
authors.lastname: Wawrzycki
mesh_terms: D049690:History, Ancient; D006801:Humans; D008297:Male; D008433:Mathematics / Q000266:history*; D008962:Models, Theoretical; D055585:Physical Phenomena; D010825:Physics / Q000266:history*