Higbee, F. G · New York, John Wiley & Sons · leaf 175
3, etc.,the point A will remain in contact with the axis and will rise equaldistances, as shown by al, a2, a3, etc. By joining the successivepositions of A and B the positions of the generating line as itmoves about the axis may be shown. If the points where theseseveral positions of the generating… … Fig. 130. WARPED SURFACES 165 the surface with H gives a curve called the Spiral of Archimedes.In the drawing only a little over one-half of one revolution of theline AB about the axis has been shown. 132. There are two general kinds of helicoidal surfaces bothof which have many practical uses.…
Geometry, Descriptive
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