Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 169
rst of which,being perpendicular to the plane of projection, gives a straight line at an angleof 45° for the outline of its shadow, whereas the side A E being parallel to 152 SHADES AND SHADOWS. that plane, its shadow is determined by a portion of a circle, ai c^ describedfrom the centre, 0. If the… … Fig. 306. Fig. 307 Fig. direction of the outline. To ascertain the point a at which the shadow com-mences, draw from a! the line a! A at an angle of 45°, and projected verticallyto a A. Then the highest point h (Fig. 308) is determined by the intersectionof the radius 0 B, drawn parallel to the…
Mechanical drawing
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