Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 88
Fio. 67 profile trace is little used, however. Hereafter, unless otherwisespecially noted, the phrase traces of a plane will be taken tomean the traces on the H and V planes. VI, § 59] POINTS, LINES, AND PLANES 69 … 57. Assuming a Plane. It will be evident at once that anytwo lines intersecting on HA represent the traces of someplane; hence to assume a plane it is sufficient to draw any twolines intersecting on HA. It may be -well to note, however, as a precautionary measureto guide ones sense of…
Geometry, Descriptive
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