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 408
e done according to the principles explained in the examplesalready given ; a quicker way if doing it, however, is as followsIf we take into consideration one ray of light in connection withall those perpendicularly under and over it, it is evident that theseseveral rays would form a vertical… … Fig. 861. nature—cutting it in the lines, ah, c d^ &c., {Fig. 360,) and, inthe elevation, find, by squaring up from the plan, the lines of sec-tion which these planes would make thereupon. For instance :in finding upon the elevation the line of section, a b, the planecuts the ovolo at e, and…
Carpentry · Architecture
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