Higbee, F. G · New York, John Wiley & Sons · leaf 172
r 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 find the elevation, divide the pitchdistance into any number of convenient parts,… … Fig. 127. about the axis, so it therefore advances in the direction of theaxis one twenty-fourth of the pitch; i then is the elevation ofits second position. In like manner all twenty-four positionsmay be located and the curve plotted. In drawing a conical helix the same principle applies except…
Geometry, Descriptive
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