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The rudiments of drawing cabinet and upholstery furniture
The rudiments of drawing cabinet and upholstery furniture Author:Richard Brown Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: DEFINITIONS OF PERSPECTIVE TERMS. Perspective is the science by which the resemblance of objects, as seen from a single point of view, is represented and prop... more »ortioned on a definite plain surface ; which plane is supposed to intercept and cut the visual beams of light which proceed from the angles of the objects to the eye of the spectator, who is considered as standing at some remote distance from that plane. This is concisely the great outline of the theory of perspective, which may be better understood by holding up at arm's length a picture-frame, containing a square of glass washed over with white hard varnish, and, when dry, marking on it with a pencil the visible lineaments, or outline appearance, of the objects as seen within the compass of the frame; which result will be the lineal picture, the glass being considered the paper on which the objects are to be painted. To produce this deceptive coincidence on an opaque surface, from a given object and point of view, and a given distance and position of the paper, situated between the object and the spectator, constitutes what is properly called the practical part. According to Vitruvius, perspective was invented by the Greeks, and owes its origin to scene-painting: however, it has since been variously applied and much cultivated, so that it is now considered as a polite art, comprehensible even by the unlearned, useful to the scholar, ornamental to the accomplished gentleman, and indisputably necessary to the artisan. If rays of light are supposed to proceed fi'om an object to the eye of the spectator, and are intercepted or cut by a plane, the common section thereon depicted is called the scenographic or perspective representation of that object: any part of an object touch the transparent plane, the part thus in cont...« less