Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 161
ot be accurately represented on a plane, but onlymately by gores. Let CAB (Fig. 284) be the eighth of a hemisphere :describe the quarter circle D A c; divide this arc into any number ofequal parts, six for instance; from the points of division1, 2, 3, . . . let fall perpendiculars on C D, and from… … >1^
Mechanical drawing
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