Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 257
I, to be extendedto meet that floor, then it will be obvious that the intersectionbetween that plane and the plane of the floor would be in the line,f k; and the \ine,fk, being in the plane of the floor, and also inthe inclined plane, J ^ kf, any line made in the plane, j^ kf,parallel tofk, must be… … Fig. 293, This may be done thus : from/, draw/ o, at right angles to/m/extend e 6 to o, and g 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, o /, is at right…
Carpentry · Architecture
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