Warren, Samuel Edward, 1831-1909. [from old catalog] · New York, J. Wiley & sons · leaf 56
N. IV … SHADES AND SHADOWS. 25 projection on a plane perpendicular to its axis. Then let NZHbe the horizontal projection of the cylinder, and take CC,perpendicular to its axis, for the ground line of a new verticalplane, parallel to the base NZ. This base will then have thecircle WOb for its auxiliary…
Shades and shadows
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