Higbee, F. G · New York, John Wiley & Sons · leaf 169
Fig. 122. 158 ESSENTIALS OF DESCRIPTIVE GEOMETRY … from the surface while another set perpendicular to the first setwill cut parabolas. (See Fig. 123.) As practical examples of this surface the pilot on alocomotive and the bow ofa ship may be cited. If one directrix is a curvedhne and one remains astraight line the surface be-comes a conoid. An…
Geometry, Descriptive
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