Anthony, Gardner Chace, 1856- [from old catalog], Ashley, George Francis, [from old catalog] joint author · Boston, D. C. Heath & co. · leaf 134
through this point m, parallel to the planedirector iV, and determine its intersectionwith one of the directrices (Art. 150, page118). Through this, and the point m, drawthe required element. The last operation isnot illustrated in the figure. … 118 DESCRIPTIVE GEOMETRY 152. Warped Helicoids. Suppose the linehc^ of Fig. 190, to be revolved uniformly aboutthe line cd as an axis while maintaining theangle 6 constant, and at the same time com-pelled to move in contact with, and uniformlyalong, the axis. All points in the line, savethat one in…
Geometry, Descriptive
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