Industrial drawing and geometry; an introduction to various branches of technical drawing (1911)
Spooner, Henry John, 1856- · London, New York [etc.] Longmans, Green, and co. · leaf 100
s it leaves it. This point of contact is the instantaneous centre of motion, and thecentre of curvature at the tracing point. 154. To describe the Involute of a Circle.—Let ACP (Pig. 239) be a diameter of the given circle, and P a i^oint in the required curve. Thendi-aw PPii tangent to the cii-cle… … Involute of a circle. 82 INDUSTRIAL DRAWING AND GEOMETRY the line PPjj into any number (say twelve ) of equal parts in 1, 2, 3, etc., and 1, 2, 3, etc., respectively, and at the points 1, 2, 3, etc., in the circle drawtangents. Now, it is ohvious that if P be the fixed end of tlie thread, and P,,…
Mechanical drawing · Geometrical drawing
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