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In the position in which the object is standing with respect to the VP, three of its sides and four of its vertical edges will be seen. Find the elevation of these edges by projectors through the points A B C D ; on the one through A set up the height of the prism equal to twice ', and at this height and parallel to the IL, draw a line cutting the projector from D in d, and the required elevation is obtained. Again Problem 41. Let Fig. 130 be tJie plan of a square pyramid, its axis vertical, its base resting on the HP, and its height equal to twice t/te length of the diagonal of its base ; find its elevation. As the solid is resting with its base on the HP, the elevation of its three base corners that will be seen viz., A B C will be found in a b c on the IL. Its apex is the point p in the plan where the two diagonal lines which are the plans of its side edges intersect. Find the elevation of the axis by a projector through p ; set off on this from the IL upwards the height of the pyramid in the point p, and join p by right lines with points a' b' c on the IL, and the required elevation is obtained. The " sectional " elevation of an object is obtained from its plan by similar methods. Problem 42. Let Fig. 131 be the plan of a solid cube resting with one of its faces on the HP, and let it be cut by a plane *S7 J perpendicular to the HP, and an elevation of it be required, when the part X, cut off by the plane, is removed. Projectors being drawn from the points A S P C, into the upper piane, as shown, and the height of the cube set off from the IL in point a' ; on the one drawn through A, a line through a, parallel to the IL, cutting the projector from C in c and the cross-lining of the part cut