Warren, Samuel Edward, 1831-1909. [from old catalog] · New York, J. Wiley & sons · leaf 148
a o ithja fI el PI XI … SHADES AND SHADOWS. 89 ;he plane qfD\ The intersection of this auxiliary shadow withthe circle qsf—qDr, gives two points of shadow on the givensurface (42). The centre of the auxiliary shadow is b\b, where the ray Ab—A!b\ through the centre of the upper circle of the concave sur-face, pierces the…
Shades and shadows
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