Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 165
Fig. 294 shows the shadow cast by a rectangular slip of cardboard at rightangles to the vertical plane; Fig. 295, the shadow cast by a slip parallel to theground plane and at right angles to the vertical plane, which is itself set at a SHADES AND SHADOWS. 149 horizontal angle; Fig. 296, the shadow…
Mechanical drawing
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