Babbitt, Arthur B. (Arthur Bradford), b. 1873 · New York, H. Holt and company · leaf 201
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 line will betangent to the arc at thepoint A. PROBLEM 20…
Mechanical drawing
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