Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 164
ing in the direction of the diagonal of a cube,of which the sides are parallel to the planes of projection. The projections ofthe ray form each an angle of 45° with, the ground line. This is not true ofthe ray itself in space, for that forms an angle of 54° 44 with the ground line,and an angle of… … Fig. 291 of the point A at an angle of 45° with the ground line, L T, and at the pointof intersection of those lines, a, erect a perpendicular to intersect the verticalprojection of the ray through A, which will be at the point «, the shadow inquestion. The converse of this method determines the…
Mechanical drawing
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