Descriptive geometry . r auxiliary plane parallel to Vor H^ and the required line will be determined. Construction. Fig. 88 represents twoplanes, T and Jf, with their horizontal tracesintersecting, bat their vertical traces inter-secting beyond the limits of the drawing. By Case 1, point d is one point in the lineof intersection between the planes. To obtaina second point an auxiliary plane -X has beenpassed parallel to V. Then HX is parallel toGrL^ and C^ the horizontal projection of theline of intersection between planes X and M,lies in HX, while (7^ is parallel to VM (Case1). Likewise B^, t
Descriptive geometry . r auxiliary plane parallel to Vor H^ and the required line will be determined. Construction. Fig. 88 represents twoplanes, T and Jf, with their horizontal tracesintersecting, bat their vertical traces inter-secting beyond the limits of the drawing. By Case 1, point d is one point in the lineof intersection between the planes. To obtaina second point an auxiliary plane -X has beenpassed parallel to V. Then HX is parallel toGrL^ and C^ the horizontal projection of theline of intersection between planes X and M,lies in HX, while (7^ is parallel to VM (Case1). Likewise B^, the horizontal projection ofthe line of intersection between planes X andr, lies in HX, while B is parallel to point a, the point of intersection betweenlines B and C, is a point in the line of inter-section between planes il[f and T, since pointa lies in line C of plane M, and in line B ofplane T. Line ad is, therefore, the requiredline of intersection between the two givenplanes. INTERSECTION BETWEEN PLANES 37. Fig. 87.
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