Warren, Samuel Edward, 1831-1909. [from old catalog] · New York, J. Wiley & sons · leaf 166
f the sphere is in theground line, one circle of the diagram represents both of its pro-jections. Then LV and \Jb are the vertical traces of tangentplanes of rays perpendicular to the vertical plane. They givea,a and b\b, as the points of shade, on the circle, Sb—Sa dc,which is in che vertical… … n xiii
Shades and shadows
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