Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 165
Fig. 293. The shadows of a rectangular slip of paper or wood, A B C D, cast upon thesame vertical plane and parallel to it, is the rectangle A B 0 D (Fig. 291). When the object is not parallel to the given plane, the shadow cast is nolonger a figure equal and similarly placed, but the method of…
Mechanical drawing
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