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Excerpt from Descriptive Geometry for Students of Engineering In Fig. 2a we see the planes Of projection, the hexagonal pyra mid, and the projections of the outlines Of the pyramid on the planes, as in a picture. All is shown as one complete view, such as we see when several sides Of an Object we are looking at are seen from a single viewpoint. If, however, the eye is moved SO that we see only one projection at a time, a set of three difi'erent views would be Obtained, called orthographic projections. By the methods of orthographic projection, these views would be arranged as in Fig. 2b. In this latter figure, a horizontal line is first drawn to represent the X axis, usually near the middle Of the space to be taken for the drawing. Then at right angles to this line the Y and Z axes are drawn as shown. To represent by this method the views shown pictorially in Fig. 2a, the horizontal projection is drawn behind the X axis and on the left-hand Side Of the vertical Y axis. The front vertical projection is drawn below the X axis and vertically below the horizontal projection. The side ver tical projection is also drawn below the X axis but on the other side Of the Z axis. As the views are thus shown the horizontal projection shows the outlines Of the pyramid when the eye is im mediately over the horizontal plane. The front and side vertical projections represent the outlines as they appear when the eye is moved in front Of the front and side vertical planes. This is a very convenient way to arrange the projections Of an Object, and it has the advantage that it is more easily understood by mechanics Of ordinary ability, than some other arrangements of the same projections that will be discussed later. 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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