Babbit, Arthur B · New York, H. Holt and company · leaf 200
To draw a tangent to acircle at a given point on thecircumference—T h r o u g hthe given point A, drawthe radial line A C. Erecta perpendicular to A C atthe point A. (Problem 4.)The perpendicular A B isthe required tangent at A,and the point A is the pointof tangency. PROBLEM 19 … To draw a tangent to anarc at a point on the arc,when the center is notknown—With the givenpoint A as a center, drawarcs 1 and 2, cutting thearc at B and C. Drawthe chord B C. Throughthe point A draw a lineparallel to B C. (Prob-lem 7.) This Hne will betangent to the arc at thepoint A. PROBLEM 20To…
Mechanical drawing
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