Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 108
e the given plane and a thegiven point. A line may be drawn through a and parallel toQ by drawing it parallel to either the horizontal or verticalprincipal lines of Q (§ 104). The line M, drawn through a, isparallel to the vertical principal lines of Q; through M passthe required plane T, parallel… … Fig. 147. Fig. 148. Special Case (Fig. 149). Let the given plane Q be parallelto the ground line. Then the auxiliary line M, drawn througha and parallel to the principal lines of Q, is parallel to GL(§ 101) and has no traces on H and V. Pass the auxiliary
Geometry, Descriptive
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