Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 86
tea unique description.However, if the planeis considered as of in-definite extent, it willintersect the planes ofprojection in two lines(Fig. 63 6, XX, XZ*),which do constitute aunique description ofthe plane. These linesare called the traces ofthe plane. (Comparethis with the definitionof the… … Fia. 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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