Practical plane and solid geometry for advanced students, including graphic statics, adapted to the requirements of the South Kensington syllabus (1899)
Harrison, Joseph, Baxandall, George Albert · London Macmillan · leaf 138
reof curvature for P. 125. Problem.—To draw an involute of a given circle,and to find the tangent, normal, and centre of curvaturefor any point P on the curve. Divide the circumference into a number of equal parts,say eight. At the division o draw a tangent, and by theaid of Prob. 113 set off 02… … Draw tangents to the circle at the points, and alongeach tangent set off the distance of the corresponding pointon o8 from o. For example, make 441 = 04. The curve may extend indefinitely outwards. Let P be any point on the involute. From P draw atangent PN to the circle, and find N its point of…
![An illustration from Vnderweysung der Messung : mit dem Zirkel vn[d] Richtscheyt in Linien, Ebnen vnnd gantzen Corporen (1525)](https://img.insideoutlibrary.com/img/200/ia-vnderweysungderm00drer-23-34.webp)
