Warren, Samuel Edward, 1831-1909. [from old catalog] · New York, J. Wiley & sons · leaf 76
PI. VI. … SHADES AND SHADOWS. 37 Pkobleh XYIL To find the axts of an elliptical shadow, two of whose conjugate diameters are known. Principles.—PL VI., Fig. 66. It has already been shown(Elemen. Proj. Drawing, Div. IY., Chap. Y.) and (Descrip. Geom.)that, if the projecting lines of an object are oblique to a…
Shades and shadows
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