The encyclopdia britannica; a dictionary of arts, sciences, literature and general information . a total length of, 1158 a, railway 200 ft. above the. water. The span of the centralopening is 525 ft. The principal rib is crescent-shaped 32-8 ft. deep BRIDGES 543 at the crown. Rolling load taken at i-2 ton per ft. Weight of centrespan 727 tons, i The Luiz I. bridge is another arched bridge over theDouro, also designed by T. Seyrig. This has a span of 566jft. • Thereare an upper and a lower roadway, 164 ft. apart vertically. The archrests on rollers and is narrowest at the cr
The encyclopdia britannica; a dictionary of arts, sciences, literature and general information . a total length of, 1158 a, railway 200 ft. above the. water. The span of the centralopening is 525 ft. The principal rib is crescent-shaped 32-8 ft. deep BRIDGES 543 at the crown. Rolling load taken at i-2 ton per ft. Weight of centrespan 727 tons, i The Luiz I. bridge is another arched bridge over theDouro, also designed by T. Seyrig. This has a span of 566jft. • Thereare an upper and a lower roadway, 164 ft. apart vertically. The archrests on rollers and is narrowest at the crown. The reason given forthis change of form was that it more conveniently allowedthe lower the lattice girders above.: >The total weight of ironwork was 3200ton? and,the cost ;£i24,6oo {Annates ^ubUgtffis,^ 1884). The Victoria Falls bridge over the Zambezi, designed by SirDouglas Fbx, arid completed in 1905, is a conibination of. girder aridarch having a total length of 650 ft. The centre arch is 500 ft. Span,therise of the crown 90 ft., and depth at crown 15 ft. The width. Fig. 28.—^Arch^of, Bridge at Coblejvs, road to pass between the springings xind ejipurejl thq-transmission 1of the wind stresses to the abutments without interrupting the cross-bracing. yifirecablf;s wereused 1 in the erection, by -vsrhich themembers were lifted from barges ai^l assenibledi the operations bejpgconducted from the side, piers. > . The l)Jiagara Falls a;!^ Clifton steel a,rch (fig- 32) replaces the olderRoebling suspension bridge. The centre span is a two-hinged para-bolic braced sib arch, andi;there are side spans of 190 andraio bridge C3,rries two electric-car tracks,two faadTiiJaysand The main spaii weighed 1629 tons,>theBid6 spans 154and 166 tons (Buck, Procl/jwj!,. C^. 70). Prof. ClaxtonFidler, speaking of the afrahgefiient iBopted for putting initialstress on the top chord, st£ited;tihat this bridge marked the furthest .between cen
Size: 2964px × 843px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectencyclo, bookyear1910
