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Excerpt from The Practice of Mechanical Drawing for Self-Instruction A draftsman should be familiar with the problems in this chapter, and should be able to construct them very accurately when necessary. In practice, they are seldom used; but unless he knows how to draw them with precision, he will not be apt to get them so nearly correct when drawing them approximately. Problems of this kind are about the best exercises for beginners in mechanical drawing. The desired results will not be obtained unless extremely 'fine, hair-like lines are drawn, and all centres and other points taken exactly on these lines. Therefore it is important to use very hard pencils sharpened to a needle or chisel point, and to avoid making holes in the paper with the compasses. Given and required lines should be drawn fine in ink, and construction lines drawn in pencil only; but, to distinguish them in these problems, given lines are heavy; required lines fine; and construction lines broken. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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