. The book of the farm : detailing the labors of the farmer, steward, plowman, hedger, cattle-man, shepherd, field-worker, and dairymaid. Agriculture. THE ELEMENTS OF THE TRUSS IN A WOODEN FIELn-OATE. total effect of the load, but simply divide it equally over the superinduced bars, supposing them to be connected with a head-post at i. But reverting again to the single bar a c. and applying to it the diagonal b c, we have now the triangular figure a b c, the parts of which being firmly connected at their points of junction, the form becomes unchangeable, and the effect of the loai at c is inst
. The book of the farm : detailing the labors of the farmer, steward, plowman, hedger, cattle-man, shepherd, field-worker, and dairymaid. Agriculture. THE ELEMENTS OF THE TRUSS IN A WOODEN FIELn-OATE. total effect of the load, but simply divide it equally over the superinduced bars, supposing them to be connected with a head-post at i. But reverting again to the single bar a c. and applying to it the diagonal b c, we have now the triangular figure a b c, the parts of which being firmly connected at their points of junction, the form becomes unchangeable, and the effect of the loai at c is instantly altered. The effect of the load at c is now resolvable by the parallelogram of forces into two others, the one of tension on the bar a c, the other of compression on the diagonal b c, and taking the length as a representative of the gravitating or direct efiect of that load, then the tension on a c will be to the absolute load as the length of a i is to that of a c, and the compression on the diagonal will be as 6 c to i a. In this example the hinges of the gate are not shown, but in actual practice the tails of the upper hinge stretch along part of the top bar, binding it securely to the heel-post, while the bottom hinge may be made to form an abutment to the foot of the diagonal. (1970.) The practical insertion of the diagonal is also of some importance. Fig. 353 exhibits one mode of performing this, where a b \s the strut half lapped upon the heel-post at bottom and upon the head-post at top ; it is not an elegant mode of insertion, but it is efficient, in so far that while it acts as a strut, it binds the top of the head-post to the top-bar, and prevents it from flying off by the thrust of the diagonal. (1971.) Fig. 354 exhibits another mode of insertion of the diagonal, which is perhaps preferable to the former; here the head of the diagonal is attached to the top bar, half lapped upon it Fig. at h, and notched into the lovver edge as an r^ abutment, forming a
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectagriculture, bookyear
