Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 160
lopment of the cut-off cone C D E as shown by the preceding construction, and A B AD E D the developed surface of thefrustum. To develop the surface of a frus-ttim of a cone, ivhen the cutting i^lanea b is i?iclined to the base (Fig. 282). On A B, the base, describe thesemicircle A 3 B ; divide the… … Fig. 282. the apex C. Divide now the arc A B A, equal to the circumference of thebase A 3 B, into twelve equal parts; each of these parts by the construction isequal to the arc A 1, 1 2; connect these points of division with the point C;on C A take C a equal to C a, a being the point at which the…
Mechanical drawing
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