Ames, William L. (William Lewis), 1855-, Wischmeyer, Carl · New York, McGraw-Hill book company, inc.; [etc., etc.] · leaf 112
lobes of 180° each, or threelobes of 120° each, etc. Thismeans, according to the equationgiven in the chapter on develop-ments, that the ratio of the slant height of the cone to theradius of the base must be a whole number and equal tothe number of lobes on the gear. The following method, due to… … 102 DESCRIPTIVE GEOMETRY with vertex at a and base be, the length be being the majoraxis of the ellipse. The ratio of the slant height ae to theradius oe is made equal to the desired number of lobes.Circumscribe a circle about the triangle. Locate the fociof the ellipse, as / and /. Produce ao to…
Geometry, Descriptive
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