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shown, we shall recognize the existence of the two planes of projection, in their pn*oper relative positions, and apply the rules for such lining in accordance with the principles before explained. As the study of the projection of solids having curved surfaces will be the next division of our subject that will occupy attention, a few words only are here necessary with reference to the lining-in of such objects in ink. As a general rule, only one kind of line the fine line is applicable to the outline representation of the curved surface of the solids of this class the cylinder, the cone, and the sphere with which we shall deal, consequent on the fact that the particular part of the curved surface of each which would cast a shadow on any adjacent surface, falls within the bounding lines of its representation, and cannot be expressed by a line, as in the case of bodies having plane surfaces. We shall, however, before completing our explanation of the projection of such solids, give all necessary information as to inking them in. 39. Before leaving this part of our subject a few words are necessary for the guidance of the student in reference to the mixing and usage of the ink with which he will line-in his drawings. Although MECHANICAL AND ENGINEERING DRAWING 83 liquid ink for this purpose is now to be purchased, it is advisable for the student to know how to make suitable ink for himself. He will not, of course, without some considerable practice, succeed in making really serviceable ink, but such as he will be able to produce will sufficiently serve his present purpose. To prepare the ink for use, let the student provide himself with a medium-sized colour saucer sold in nests of half-a-dozen by any artists' colourman and having procured a stick of good India-ink and a