Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 158
. One of these curves disappears at 0, but reappears again at I. The exterior and interior circles of the plan represent the horizontal projection of the solid in question. The co?iical helix differs from the cylindrical one in that it is described onthe surface of a cone instead of on that of a… … Fig. 279. DEYELOPMEXT OF SURFACES. The development of the surface of a solid is the drawing or unrolling on aplane the form of its covering, the form that cut out of paper would exactly fitand cover the surface of the solid. Frequently, in practice, the form of the 142 ORTHOGRAPHIC PROJECTION.…
Mechanical drawing
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