Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . of wnikiiiH ~the liaiidli, anda reeiprucatingmotion in wliichthe liaiulie isworked iip anddownlikeapuiup-handlc. In theordinary rotarymotion tlu? ratch-et movftnt-nt ofthe cap is notutilized ; but, I when tlie nia.\i- mum i>o\ver ofthe appiiiatiis isrequired, thepumping motionis adopted. Tliehandk- is extensi-ble according tothe power re{[nired, and about ten
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . of wnikiiiH ~the liaiidli, anda reeiprucatingmotion in wliichthe liaiulie isworked iip anddownlikeapuiup-handlc. In theordinary rotarymotion tlu? ratch-et movftnt-nt ofthe cap is notutilized ; but, I when tlie nia.\i- mum i>o\ver ofthe appiiiatiis isrequired, thepumping motionis adopted. Tliehandk- is extensi-ble according tothe power re{[nired, and about ten times the usualpower may be obtained by the rccipiocating motion,owing to the leverage obtained and the favorableposition for the workman to throw his weight uponthe handle, as in working a windlass. See also BRAtKKr-(l;AH. Giran-dole. A branching caudle - holder orchandelier. A tjasalier. Girder. A principal beam of a floor, spanningthe distance from wall to wall, and affording a placeof attachment for the bimlers, to which the lloor andceiling joists are connected. In roofs of a less comjtound structure, the girderor summer - beam, sometimes trussed, spans the Fig. 2227. Girrlers- buihling longitudinally, and the joists proceed fromit to the walls on each side. See Floor. Girders are often compound, the timbers beingscarfed together and stayed by truss-work or fishedat the junction. Smenton bent the girders upward and trussedthem in that position. In double-framed floors, the hiiidiiig-joisls n, in-stead of resting on the walls, are sn|iporteil by largetimbers »/, culled girders. Tile briiltjinij-joists s reston the binding-joists n, and the ceiliiiy-joists c aresecured beneath the girder m. a to I are forms of wrought-iron girders. m to z are forms of cast-iron ginlers. Plate-iron girders are made of several forms. Tile I-girder a a is rolled in one piece. The co/iijmund I-girder b b has tlat top and bottomplates secured by atiglc-ironx to the vcb. Another fo
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Keywords: ., bookcentury1800, booksubjectin, booksubjectmechanicalengineering
