Ames, William L. (William Lewis), 1855-, Wischmeyer, Carl · New York, McGraw-Hill book company, inc.; [etc., etc.] · leaf 108
act with the hyperbola. Thesurface is best studied by con-sidering it as generated by the firstmethod. Suppose the line be, Fig. 182, torotate about the vertical axis 0,keeping at_ a constant distance Oafrom it and making a constant angleOwith H. The line will take thesuccessive positions… … Fig. 182. 98 DESCRIPTIVE GEOMETRY Any meridian section will be an hyperbola having 0 as itsconjugate axis. It will be seen that the same surface wouldhave been generated if the line having the plan fe^c* had hadthe point c in the plane of the top and b in the plane of thelower base. Hence the…
Geometry, Descriptive
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