Synopsis
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. 1878 Excerpt: ... vanishing plane of the lines 2, 4, and 2, 3: C D is equal to the length of that plane, D, is the measuring point of the vanishing point C; lines G U, or V P, represent the vanishing plane of the line 5, 6; V M is the length of that vanishing plane, M being the measuring; point of line 5, 6. See also note, page 23. Let us proceed to fig. 26, plate 8, where C is the centre of vision, H the horizontal line, C P the principal visual ray, and Q-, the picture or ground line, 5 feet below the horizontal line. It i3 proposed to place a square in perspective on the ground plane, one of its angles touching the plane of the picture, its sides making angles with that plane equal to the angles a and o, and each of its sides to be 10 feet in length. At the extremity P of the principal visual ray, or line of direction, draw a line perpendicular to C P, as line h h. At P, on line h h, construct angles equal to angles a and b, as c and d, producing their sides until they cut the horizontal line in V 1, and V 2. These will be the vanishing points of the sides of the square. Prom V 1 with line V 1, P as radius, describe an arc cutting the horizontal line in M 1. Prom V 2, with line V 2, P, as radius, describe an arc cutting the horizontal line in M 2. M 1, and M 2, are respectively the measuring points of the vanishing points 1 and 2. Let us assume o as the seat of the angle of the square touching the picture line. Draw lines from o, to V 1, and V 2. From o set off to the right and left, 10 feet by scale, as at 10 and 10, (the distance of the picture line from the horizontal line having been given as five). From the 10 to the left draw a line to M 1, it will cut line o V 1 in e--o e will be 10 feet. From the 10 to the right draw a line to M 2, it will cut line o V 2 in f--o/...
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