Higbee, F. G · New York, John Wiley & Sons · leaf 179
e H or V to get the base. Construction. In Fig. 136, MN is the axis of the given helixABCD. By Article 130 draw a number of tangents to the helixand find where these tangents pierce H at i, 2, 3, 4, etc. Thecurve through these points will be the base in H. 136. In Fig. 137 is shown the plan and… … WARPED SURFACES 169 the length of the generatrix or the outside diameter of the con-veyor flights. Given these data the drawing is made as follows:Tangent to the directing helix at B draw AB. A is the pointwhere the line, which is a position of the generatrix parallel to
Geometry, Descriptive
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