Excerpt from A Manual of Elementary Problems in the Linear Perspective of Form and Shadow; Or the Representation of Objects as They Appear, Made From the Representation of Objects as They Are: In Two Parts; Part I. Primitive Methods; With an Introduction; Part II. Derivative Methods; With Some Notes on Aerial Perspective In pencilling a drawing which is to be inked, use a pencil sharpened on a fine file, to a thin edge, rather than a round point, since it will thus keep sharp much longer. 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.