A Practical Treatise of Perspective (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1803 Excerpt: ...inclination to the picture; after which lines must be drawn at the eye, making similar angles with the sirst given line, which the different sides of the polygon make with each other; which lines will produce the vanishing points, by their intersections with the horizontal line. But this process, though elegant and scientisic, is not so ready and useful to the artist as the one here given. But should any one desire to pursue this part of the subject, he will sind it amply treated by Hamilton and Malton: the latter in his sirst volume, Book iii. Plate XIII. As. T. As edisices are very seldom constructed upon the plan of any polygon, except that of the octagon, the foregoing instructions will be sufficient for the artist in all cafes whatever, for the vanishing points of the sides, as also the dimensions of those sides are all determined by the fame process which is employed in the four preceding examples. Of Circles and Semicircles in Perspective, Plate XXIII. As it may he presumed that the student has already made himself master of the rules, by which the vanishing points of horizontal lines inclined to the picture are found; no directions are given for that part of the process in the succeeding examples of this Section, but the center of the picture and vanishing points are indicated, as already determined. For it must be evident to the slightest observation, that the lines whierr-are called the parallel of the picture, and the parallel of the eye, are of no use after the vanishing points are found; therefore, those lines are omitted in the following examples, to prevent the confusion which would otherwise necessarily result from their number. In the following examples and instructions, the application of circles aud semicircles in the representations of c...