Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 156
e beam, A B ; draw d e, parallel to Bb ; then b e, (by the same scale,) equals the pressure in the direc-tion, b A ; and e d, the pressure against the wall at B—and alsothe horizontal thrust at A, as these are always equal in a construc-tion of this kind. Fig. 194 represents two equal beams,… … Fig. 194. pressures at B, being equal and opposite, balance one another;and their horizontal thrusts at the tie-beam are also equal. (SeeArt. 250—Fig. 186.) When the inclination of a roof, {Fig.194,) is one-fourth of the span, or of ashed, {Fig. 193,) is one-halfthe span, the horizontal thrust of a…
Carpentry · Architecture
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