Descriptive geometry . and should pass through thepoint of intersection of VP and (rX, makingthe angle 6 with VP. PSdnd PiV intersect incZ^, the profile projection of one point in therequired line of intersection. In counter-revolution, that is, revolving P back into itsformer position perpendicular to both Fand ZT,rotation will take place in a direction oppositeto that of the first revolution, and d^ and d^will be as indicated. Fig. 94 represents the same problem whenthe auxiliary profile plane P has been revolvedin the opposite direction to coincide with V Figs. 95 and 96 are examples of the
Descriptive geometry . and should pass through thepoint of intersection of VP and (rX, makingthe angle 6 with VP. PSdnd PiV intersect incZ^, the profile projection of one point in therequired line of intersection. In counter-revolution, that is, revolving P back into itsformer position perpendicular to both Fand ZT,rotation will take place in a direction oppositeto that of the first revolution, and d^ and d^will be as indicated. Fig. 94 represents the same problem whenthe auxiliary profile plane P has been revolvedin the opposite direction to coincide with V Figs. 95 and 96 are examples of the sameproblem when the auxiliary profile plane Phas been revolved about JIP as an axis until itcoincides with S. Tlien CrL will representthe revolved position of the line of intersectionbetween V and P, and the line VP JIP willrepresent the revolved position of the line ofintersection between ^and P. Pas will thenmake its angle 6 with GrL, and its directionwill be governed by the rotation assumed. COUNTER-REVOLUTION 41. Fig. 93.
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