Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 183
nd 3 from H. 149. To Find the Line of Intersection between Any TwoSurfaces. The general problem of intersection is extremely important./ It arisesconstantly in connec-tion with roofing andvaulting. A largenumber of the prob-lems in stereotomy andin shades and shadowsare merely intersectionproblems.… … Fig. 160 VIII, § 149] CURVED SURFACES 165 familiar. In Fig. 160, the plane A cuts from the cone thecircle bcdmn. From the sphere the plane A cuts the circlemnp. The points m and n, where these circles intersect, arecommon to the sphere and cone. Hence m and n lie on theline of intersection of…
Geometry, Descriptive
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