A practical course in mechanical drawing for individual study and shop classes, trade and high schools (1912)
Willard, William Franklin, 1879- · Chicago : Popular mechanics company · leaf 136
A semicircle will suffice.Divide into an equal number of points for convenienceand project back to the corresponding: plan and eleva-tion. Connect these points with R, X, Y and Z, andproceed with the development. Lay off plane A first. Fig. 136. With 6 as a cen-ter, strike an arc equal to 6—5 (on… … Fig. 135 134 A PRACTICAL COURSE IN A. When all of the longer diagonals are used addplanes B and C, and then add the diagonals laid outon the left of OP. The plane D is bisected to showa symmetrical development.
Mechanical drawing
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