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 51
to aradius at its extremity in the circle. A tangenttouches the circle in a point, as at P, Fig. 88(which is called the point of contact), where theline AB touches the circle, and it is perpendicularto the radius OP. Point of Contact. — Where two circlestouch one another, they do so in a point… … Pig. 38.—Circle andtangent. Fig. 89.—Point of contact oftwo circles. Fig. 90. - -An arc described through threepoints. CIRCLES, ARCS, AND LINES 33 of contact. It is only when tliis condition is satisfied that a part of one circle can be made to flow into a part of the other; the thick line in the…
Mechanical drawing · Geometrical drawing
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