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front ends. In Fig. 103 the boundary lines of the projection are the same as in Fig. 101, but the part of the cube exposed by the action of the section plane SP, is that between the parallel lines ss, pp' 9 and has to be section-lined, as shown. Had all the faces of the cube been coloured, only those parts of the two seen when looking in the direc- tion of the arrow x viz., from the edge at S to that at A, and from P to that at C would show of that colour ; the surface exposed by the section being, of course, that of the material of which the cube is made. The faces of the cube parallel to the YP in Fig. 100 are, of course, in Fig. 103 seen only as lines, as aty^, f'g', and as the cube is of solid material the edge of it at D, directly opposite to that at B, will not be seen in the side elevation. As further problems in the projection of solids in the "upper plane," we give those shown in Figs. 105, 106, and 107, where the original object or cube, Fig. 104, is cut by section planes 1, 2, 3, making different angles with the HP, but all of them perpendicular to the YP. As there is really no material difference of procedure in obtaining such projections of the solid from that already so fully explained in the previous problems, it is not necessary here to go through the process in detail, as the construction lines given in con- nection with each figure are sufficient to enable the student to work MECHANICAL AND ENGINEERING DRAWING 63 &. I I 1