The American house-carpenter; a treatise on the art of building, and the strength of materials (1867)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York, J. Wiley · leaf 402
SHADOWS. 389 509.— To find the shadow cast upon a cylindrical wall by avrojection of any kind. By an inspection of Fig. 349, it will beseen that the only difference between this and the last examples,is, that the rays in the plan die against the circle, a b, instead ofa straight line. … Fig. 850. 510.— To find the shadow cast by a shelf upon an inclinedvmll. Cast the ray, a b, {Fig. 350,) from the end of the shelf tothe face of the wall, and from b, draw b c, parallel to the shelf;cast the ray, d e, from the end of the shelf; then the lines, d eand € c, will define the shadow.…
Carpentry · Architecture
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