Higbee, F. G · New York, John Wiley & Sons · leaf 173
y-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 l62 ESSENTIALS OF DESCRIPTIVE GEOMETRY that it must be remembered that the H projection… … Fig. 12 Fig. 129. shows the construction of a conical helix and the method offinding its projections. 130. To Draw a Tangent to a Helix. If in any given helix thegenerating point starts from H, as in Fig. 125, it will be foundthat the distance from any position of the point on the curveback to H…
Geometry, Descriptive
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