# The Rudiments of Practical Perspective

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## Description

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. 1822 edition. Excerpt: ...in perspective, if the sides of the figure to be projected be numbered 1,2, 3, &c. whatever vanishing point we begin with as the first, in proceeding in direct order round the figure, we must pass over the next, and go to the third vanishing point, if so many, and the third vanishing point will be the vanishing point of the second side of the figure; from the third vanishing point, we must proceed to the fifth, if so many, and the fifth vanishing point will be the vanishing point of the third side of the figure; and so on, if more, always passing by one of the vanishing points in the vanishing line. If the number of of sides are odd, we must return to the second vanishing point, which will give the vanishing point of the next side of the figure in progressive order; from the second vanishing point, we must proceed to the fourth, if so many, and this will give the indefinite representation of the next side of the figure; and so on, always passing by one as before, until all the vanishing points are exhausted. When the sides of the polygon are even, its opposite sides being parallel, the sides of the figure will consequently require only half the number of vanishing points; so that if any number be the vanishing point of a side, half the number of the sides of the polygon, added to that number, will be the number of the side opposite and parallel; that is, in a square which has four sides, half the number will be 2, this added to the number 1 of the first vanish ing point, gives 3, 9hews that the first and third sides have the same vanishing point, and the second and fourth, have another common vanishing point for these two. In like manner in a hexagon, the first and fourth have the same vanishing point, the second and fifth have the same...