Ames, William L. (William Lewis), 1855-, Wischmeyer, Carl · New York, McGraw-Hill book company, inc.; [etc., etc.] · leaf 61
ces. Case h.—When one pairof traces is parallel, theother intersecting (Fig. 90).The pair of intersecting tracesgives one point of the re-quired line. The directionof this line will be parallelto the parallel traces; for if two intersecting planes in-tersect a third plane in parallel lines, all… … INTERSECTIONS 51 Fig. 91 plane 7 is taken parallel to V. The pair of inter-secting H traces gives the H trace of the required line.The direction of this hne will be parallel to the V traceof the other plane; for if two parallel planes are inter-sected by a third plane, theirlines of intersection…
Geometry, Descriptive
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