Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 248
lel. Hence they will intersect. The points of inter-section, m, n, o, and p, are on the surfaces of both vaults, and XI, § 193] APPLICATIONS OF CHAPTERS VII-VIII 229 hence are points on the line of intersection of the vaults. Othercutting planes, parallel to X, would give other points, helpingto… … elements which are shown by the dotted lines. These elementsin turn locate the four points qrst. The two curves thus determined are, in general, some formof space curve. When the intersecting vaults are semicir-cular, and their centers are at the same height, the plan ofthe line of intersection is…
Geometry, Descriptive
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