Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 131
from the sphere and a line of greatest declivity from theplane. The Une and the circle will be tangent. 112 DESCRIPTIVE GEOMETRY [VI, § 100 In Fig. 112, let ode be the plan and ahc be the elevation ofthat part of the auxiliary sphere which lies in the first quadrant.Any cutting plane passed as… … Fia. 112 respectively, to have been revolved into V on 0^0 as en axis.The quarter circle will coincide with cb, and the tangent, beinga line of greatest declivity of the required plane, will makethe given angle a with HA, since it here appears at its trueinclination. Draw such a line, me. Its…
Geometry, Descriptive
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