Warren, Samuel Edward, 1831-1909. [from old catalog] · New York, J. Wiley & sons · leaf 36
pin. … SHADES AND SHADOWS. 13 tical edge at q; q being found at the intersection of this edgewith the vertical projection, dq, of the ray through d,df. Fromq the shadow qcr is parallel to the line de — dre\ which casts it,since that line is parallel to the vertical face, qc, of the pillar (6).The ray…
Shades and shadows
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