Warren, Samuel Edward, 1831-1909. [from old catalog] · New York, J. Wiley & sons · leaf 180
Il XIV … SHADES AND SHADOWS. 109 tion of the plane of the paper, which is the isometrical plane ofprojection, with an auxiliary plane, taken as a vertical plane ofprojectioD, and on which EF is the trace of a plane of rays.Project back O at 0, and make OErrOF, and each equal toOA. Then E/F/ is the auxiliary…
Shades and shadows
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