Excerpt from Intermediate Course in Mechanical Drawing The dimension lines and all imaginary lines, or those which do not repre sent parts of the object itself, but serve as bases or lines of reference, or which are necessarily used in the construction of the drawing and the preservation of which would be desirable, should be distinguished from the black lines of the object in such manner as not to interfere nith the clearness of the latter. In other words, the object should stand out boldly and clearly to permit a ready general comprehension of it, while the detailed information concerning it should be kept somewhat in the background. The importance of this is not so appar ent in the drawing of the simple geometrical solids in the following problems, but it is very great in all work of any intricacy. 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.