Warren, Samuel Edward, 1831-1909. [from old catalog] · New York, J. Wiley & sons · leaf 86
e method, statedabstractly, is this : Two surfaces, M and N, being tangent in a curveof contact, K, the intersection, T, of the line of shade of N with thecurve of contact, K, is a point of shade, common both to M and ~Ntand hence a point of the curve of shade ofM. Remark.—The method just explained… … ri.vn.
Shades and shadows
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