The American house-carpenter; a treatise on the art of building, and the strength of materials (1873)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York : J. Wiley · leaf 383
we shall greatly shorten the process for obtaining ordinates. 368 AMERICAN HOUSE-CARPENTER. … Fig. 824 / This may be done thus : from/, draw/o. at right angles tofm;extend e b to o, andg-j, to t; from o, draw o /, at right angles too/, and join t and/; then £ o/ will be a perpendicular plane, atright angles to the inclined plane, t g kf; because the base ofthe former, o/ is at right angles…
Carpentry · Architecture
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