Warren, Samuel Edward, 1831-1909. [from old catalog] · New York, J. Wiley & sons · leaf 136
PI X … SHADES AND SHADOWS. 81 AB, T and T will be consecutive points of shade, and theirtangents consecutive parallels. On AB, therefore, T and Tunite, and their separate tangents coalesce, forming a tangent tothe curve of shade at T. f Those of the secant planes which intersect the gorge, cutthe…
Shades and shadows
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