. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. used in this methodare the same as those for double-framed fioorinu of ^vliich, indeed, it is hut a species. 20iO. The double-frumed floor diflTers only from the last-named by the binding joists, instead of going from wall to wall, being framed into large ))ieces of timber called girders (as shonn in Jig. Gl-i. ), wherein A is tlie girder, B a binding joist, C a bridging joist. Da ceiling joist, E the pulley mortice for the ceiling joist D, and F is
. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. used in this methodare the same as those for double-framed fioorinu of ^vliich, indeed, it is hut a species. 20iO. The double-frumed floor diflTers only from the last-named by the binding joists, instead of going from wall to wall, being framed into large ))ieces of timber called girders (as shonn in Jig. Gl-i. ), wherein A is tlie girder, B a binding joist, C a bridging joist. Da ceiling joist, E the pulley mortice for the ceiling joist D, and F is the floor. The great aavantages of this sort of flooring are, that it prevents the passage of sound between the stories, and enables the architect to make a solid ceiling. 2021. As in a double-framed floor the girdcis are the chief supports, it is exceedinglyimi)ortant that they should be sound and free from shakes. The distances between oi:egirder and another, or the wall, should not exceed 10 feet, and their scantlings as n theIoUowing table : — (iirders of the length of 10 feet should be 9 inches deep, 7 inches wide. I-i;;. ;.. 121416 182()222*26 30 101112121314],^16lbIfi 9101111\9,IJ12I :<14 Chap. III. CARPENTRY. 619 2021a. Girders or beams wliose bearing exceeds 24 feet are difficult to be prociind ofBufticient depth, in wliicli case an expedient is put in requisition to strengthen a less principles it involves are explained under the head of roofs, namely, those of tru^sin k#a s? - tia •II?—rr^ -^-^~c • ;a • a:: • ?r- ..9i:^l •?fi iS= = -JH -^^
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