Warren, Samuel Edward, 1831-1909. [from old catalog] · New York, J. Wiley & sons · leaf 112
VI. vin … SHADES AND SHADOWS. 65 Also, the intersection of the plane of rays through the element,with the given helix, is the point casting a shadow on that ele-ment, at its intersection with a ray through that point. Construction.— In PL VIIL, Fig. 23, let AT—I//T/ (53—2°) beany assumed element. It pierces…
Shades and shadows
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