Higbee, F. G · New York, John Wiley & Sons · leaf 99
Fig. 70. 88 ESSENTIALS OF DESCRIPTIVE GEOMETRY … Fig. 71. There are innumerable warped surfaces since there are innumerable combinationsof generatrices, directrices,and plane directors butcomparatively few of themare important commer-cially, and these will bediscussed in detail in alater chapter. 78. .A surface of revolu-tion is generated by…
Geometry, Descriptive
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