Ames, William L. (William Lewis), 1855-, Wischmeyer, Carl · New York, McGraw-Hill book company, inc.; [etc., etc.] · leaf 106
ution having the same axis, the Hues of intersection HELICOIDAL SURFACES 95 are helices having the same axial pitch, but inclined to thebase of the cylinder at angles whose tangents vary inverselyas the diameter of the cylinder. In general helicoidal surfaces are not developable, andare sometimes… … FiG. 180. tive elements are consecutive tangents to the helix, andtherefore intersecting hues. This surface is called thedevelopable helicoid. Figure 180 represents that portion of the surface includedbetween two parallel planes at a distance apart equal to thepitch of the helix. If a card be cut…
Geometry, Descriptive
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