Warren, Samuel Edward, 1831-1909. [from old catalog] · New York, J. Wiley & sons · leaf 146
ertical plane of projection. In the counter-revolution, d,dn and r\r return, respectively,in the horizontal arcs, dd—dd\ and rr—rV, to their truepositions, at d.d and rV, as the highest and lowest points ofthe required shadow. 2°. To find any intermediate points. Any horizontal plane, as qD\ cuts… … bL«: F^---- - 36 38
Shades and shadows
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