Descriptive Geometry for Students of Engineering (Classic Reprint) 9780365452782

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Автор: Moyer James Ambrose
Название: Descriptive Geometry for Students of Engineering (Classic Reprint)
ISBN: 9780365452782
Издательство: Forgotten Books
Классификация: ISBN-10: 0365452785
Обложка/Формат: Hardcover
Страницы: 236
Вес: 0.47 кг.
Дата издания: 11.02.2019
Язык: English
Размер: 22.86 x 15.24 x 1.42 cm
Поставляется из: США
Описание: 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 difierent 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.

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Descriptive Geometry for Students of Engineering (Classic Reprint), Moyer James Ambrose