Popular science monthly . 73^2 Popular Science Monthly If the reader will pause a uioinent tolook at the acxoiiipan\in^ photograph ofthe bridge, he will note a series ofperfectly good cajjital Ks made up ofvertical steel posts and diagonal picture shows also the traveler,which is nothing more or less than agreat steel towercarrying giganticmovable cranes ontop to handle theheavy pieces ofsteel, some weigh-ing one hundredtons. By examin-ing the diagram ofthe bridge, it willbe seen that bothnorth and southsections of tlu-bridge, symmetric-al about the mainpiers, are made u|)of a series
Popular science monthly . 73^2 Popular Science Monthly If the reader will pause a uioinent tolook at the acxoiiipan\in^ photograph ofthe bridge, he will note a series ofperfectly good cajjital Ks made up ofvertical steel posts and diagonal picture shows also the traveler,which is nothing more or less than agreat steel towercarrying giganticmovable cranes ontop to handle theheavy pieces ofsteel, some weigh-ing one hundredtons. By examin-ing the diagram ofthe bridge, it willbe seen that bothnorth and southsections of tlu-bridge, symmetric-al about the mainpiers, are made u|)of a series of K systemhas a number of. Cast-steel rocKerwhich probablyfoiled Pirst. f- Vtfoter How did the disaster occur? Probably the steelrocker casting under the south upstream comersuddenly crumpled. The truss then dropped onthe carrying girder, kicking it out or turning itenough to let the corner of the truss slip off advantages for a bridge of great of these is tliat during erection ofthe cantilever arms, each panel or Kcan be completed without temporarysupports and the traveler moved out tothe end. It will be remembered thatconditions at this bridge site madetemporary supports out of the question. The top chords of the arms are intension; that is, the forces acting uponthem tend to stretch them. So, theyare made up of great e>-ebars, thirty-twoof them on either side of the main postshaving a cross-section of eight feet ofsolid steel. The bottom chords are incompression; that is, the forces acting(»n them tend to shorten them. The great post over the main ])ier isthree hundred and ten feet high andwei
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
