Higbee, F. G · New York, John Wiley & Sons · leaf 171
ted by moving a pointaround and along an axis at a uniform rate. The distance fromthe axis may be constant giving a cylindrical helix (Fig. 125), orit may vary uniformly giving a conical helix (Fig. 126). In i6o ESSENTIALS OF DESCRIPTIVE GEOMETRY either of these cases the distance the generating… … 129. To construct a cylindrical helix it is necessary to knowthe pitch and diameter of the cylinder on which the helix may bewrapped. In Fig. 129 the pitch and diameter of the cylinder aregiven. The plan view of the curve will be, of course, a circle and WARPED SURFACES l6l may be drawn at once. To…
Geometry, Descriptive
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