. Perspective for art students . Fig. 189.—The junction obtained by means of the ground-plane. be dropped from A it will find what we may call thefoundation of the house on the ground-plane at , the plane of the side of the house does not passthrough , which is the concerned in EA, butwe can make AY from 60, which is the con-cerned in the side of the house. YA will be where theplane of the house cuts the bank, and YA can thus becontinued up to the top at Z. We do not already possess point X, as we do A; weonly have M above it. But we can find M on the Solving Problems
. Perspective for art students . Fig. 189.—The junction obtained by means of the ground-plane. be dropped from A it will find what we may call thefoundation of the house on the ground-plane at , the plane of the side of the house does not passthrough , which is the concerned in EA, butwe can make AY from 60, which is the con-cerned in the side of the house. YA will be where theplane of the house cuts the bank, and YA can thus becontinued up to the top at Z. We do not already possess point X, as we do A; weonly have M above it. But we can find M on the Solving Problems 249 ground by drawing from A a line under IM. IMvanishes at 30° left, so AM must vanish there too, not A line being thus drawn from A to 30, anda vertical dropped from M, we get M. Just as A isrelated to E and E to A, so M can be related to W andW to X by drawing through M a line from to theedge of the bank, and then another from W to ,giving method is to find the of the lines of Wf. 1/B2 Fig. 190.—The junction found by the of the lines of junction. junction. This is done in Fig. 190. We arrive at themethod as follows: IM vanishes at 30. AX isunder IM; it is in the same vertical plane, therefore of AX will be on the same vertical as , the of IM is 30. Through 30 wedraw a vertical But AX is also in the obliqueplane, and must have its on the of the obliqueplane. Its will therefore be at one and the sametime in both the vertical through 30 and theoblique Where the two cross must be the 250 • Perspective of AX. Having point A, we can easily draw tothe of AX, and so obtain X by a line fallingfrom M. In the same way, AZ is in both the vertical planethrough 60 and the oblique plane. Its musttherefore be where the vertical through 60strikes the oblique Question 6 (June, 1901). Diagram, Q. 6 gives the perspective view o
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