Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 84
tutea unique description.However, if the planeis considered as of in-definite extent, it willintersect the planes ofprojection in two lines(Fig. 63 h, XX, XX),which do constitute aunique description ofthe plane. These linesare called the traces ofthe plane. (Comparethis with the definitionof the… … Fig. 64 68 DESCRIPTIVE GEOMETRY [VI, § 56 When the planes of projection are opened or flattened out,these traces become merely two lines intersecting on HA, as V
Geometry, Descriptive
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