Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 161
>1^ … Fig. 284. equal divisions; then from either side of this line lay off V 1, 2 2 .... D B equal to the arcs 1 l^ 2 2 D B (Fig. 284). Connect the points C, 1\ %\ .... and C A B is approximately the developed surface. In the preceding demonstrations the forms are described to cover the sur-face only;…
Mechanical drawing
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