Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 44
of shadows, if the length of the shadow isfound to be 40 feet and the shadow cast by a 10-foot rod is 8 feet, then by plotting the height is found, as before, 50 feet. The value of the above solution of geometrical problems depends on theaccuracy of the drawing. To construct a square equal to one… … Fig. 90. t
Mechanical drawing
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