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 381
I, to be extendedto meet that floor, then it will be obvious that the intersectionDetween that plane and the plane of the floor would be in the line,f k; and the line,/A:, being in the plane of the floor, and also inthe inclined -plane, jgkf any line made in the plane, J^ A*/parallel to/A:, must be… … Fig. 824. This may be done thus : fromjT, draw/ o. at right angles io fm ;extend e 6 to o, and^ J, to t; from o, draw o t, at right angles toof, and join t and/; then t of will be a perpendicular plane, atright angles to the inclined plane, t g kf; because the base ofthe former, of is at right…
Carpentry · Architecture
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