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 106
s QP, PR at right angles by the linesAC, BC meeting at C; then a circle with centre C passingthrough P will also pass through Q and R. Suppose nowthe two points Q and R to move along the curve and toapproach indefinitely near to P. Then in the limit the twobisectors AC, BC become normals to the… … Definition 2.—The circle of curvature at any point in acurve is the circle passing through the point and through twoother points in the curve indefinitely near the first. Its radiusis the radius of curvature, and its centre, called the centre ofcurvature, is the point of intersection of the normal…
