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 138
evelopment of ^ thelateral surface similar in shape to Fig. 136, scale iequals i^-o. In this problem it will be necessary to find the truelength of all elements by revolving the true length (ofall) parallel to the vertical plane upon which the frontview is projected. To do this use X as a center… … Fig. 137 When the plane CD cuts the new position, X—6will be the true length of that portion w^hich consti-tutes the surface and can be laid off on X^—6 of thedevelopment. Fig. 138. 136 A PRACTICAL COURSE IN
Mechanical drawing
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