Warren, Samuel Edward, 1831-1909. [from old catalog] · New York, J. Wiley & sons · leaf 154
he, cutting the torus in a circle, at hft. The cir-cle, yb, with centre h and radius hy, equal to GrV, is the auxiliaryshadow of the upper circle, GV, on the plane he. This shadowmeets the circle eh, cut from the torus by the plane he, at twopoints, one of which is b. Then b is vertically projected… … PLXII.
Shades and shadows
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