Babbitt, Arthur B. (Arthur Bradford), b. 1873 · New York, H. Holt and company · leaf 197
To bisect an angle—WithA as a center and anyradius, draw an arc, inter-secting the sides of theangle at B and C. WithB and C as centers andequal radii, draw arcs, in-tersecting at D. Line DA will bisect the angleB A C. 186 MECHANICAL DRAWING PROBLEM 11 … To construct an equilateraltriangle on a given base,—The line A B is the givenbase. With A as a center,draw arc 1 through B.With B as a center, drawarc 2 through A and inter-secting arc 1 at C. LinesC A and C B complete thetriangle. PROBLEM 12
Mechanical drawing
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