Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 156
nd 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 rafter, whose centre of gravityis at the middle of its length, is… … L-v^ fig. 195. 258.—In shed, or lean-to roofs, as Fig. 193, the horizontalpressure will be entirely removed, if the bearings of the rafters, asA, B, {Fig. 195,) are made horizontal—provided, however, thatthe rafters and other framing do not bend between the points ofsupport. If a beam or rafter…
Carpentry · Architecture
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