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 177
essures, it will be found in every case that the horizontalpressure of one strut is exactly equal to that of the other, how-ever much one strut may be inclined more than the other;and also, that the united vertical pressure of the two struts isexactly equal to the weight, W. (In this calculation… … Fig. 209. 268.—Suppose that the two struts, B and JB, (Fig. 208.)were rafters of a roof, and that instead of the blocks, A and A-the walls of a building were the supports: then, to preventthe walls from being thrown over by the thrust of B and B,it would be desirable to remove the horizontal…
Carpentry · Architecture
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