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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. 1764 Excerpt: ... for the circle in the picture; on the points a, 5, B, 6 7, c 8, x, raise perpendiculars at pleasure, and let BD be the height given; draw DO cutting the lines xe, cfzi. e andy; through e, draw aline parallel to the horizontal line, cutting the lines bh, ag, at h and-; from V through g draw a line cutting the perpendicular 5 1, at 1, and a line from h to V, gives the point 3; on the line 7 3, from 3 draw a line parallel to gh, it will give the point 4 on the perpendicular 84, and through 1 draw a line parallel to gb, it gives the point 2 on the line 62, then join hzDigf 4 for the circle at top, and if the two circles be joined by a number-of right lines, it will form the cylinder required. But as in all round bodies we cannot see quite half though ever so remote from it Then to find on the picture as much as we can see, at any distance: -when the circle 56678 is found, take the longest line from x to the circumference in the arch bca as ix, and xs in the arch a Bb, and on i and / erect the perpendiculars ir, and s-w, cutting the circle at top at r and w, then ir and sw will be the out lines of the cylinder, being as much as can be seen from that point of iight. Example XVIII. Tofieio the perspective of a cylindrical body lying on the ground at right angles with the picture. The picture having every thing the same as in the foregoing example, the line a C (fig. 3.) vanishing at O, is the axis running through the cylinder. All the circles on the body are parallel to the picture; and are described with compasses; draw Bb, to the point O. Oji the ground line B G, set the measures for the distance stances between the circles, and length of the body. To find the circle c de on the line BG, let the point A be the distance for one circle: draw AH, which gives the po..

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