Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 165
alprojection of the ray through A, which will be at the point «, the shadow inquestion. The converse of this method determines the shadow of the point on the 148 SHADES AND SHADOWS. horizontal plane. The shadow thrown by B of the given line falls at J, and thestraight line a h, which joins thesetwo… … A^^ W 3^
Mechanical drawing
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