Higbee, F. G · New York, John Wiley & Sons · leaf 156
o assume a point onthe surface of a surface ofrevolution one projection maybe assumed, as x in Fig.114, and the other projectionfound by passing a meridianplane MN through the as-sumed point and revolvingthis plane into coincidencewith the meridian plane CD.In this position the point Xwill be… … Fig. 114. 146 ESSENTIALS OF DESCRIPTIVE GEOMETRY It will be noted that the point projected on H at x may havetwo elevations and which of these is to be taken depends uponwhich side of the sphere the point is assumed originally. 116. In finding the intersections cut from surfaces of revolu-tion by…
Geometry, Descriptive
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