. Baltimore and Ohio employees magazine . o. 8, the first passenger train to use thethe new structure, crossed at bridge is the largest single leafBascule span in the world, the movablespan being 235 feet long. Thirteen hun-dred and fifty tons of structural steel, onehundred and fifty tons of machinery, andtwenty-two hundred tons of concretecounter weight go to make up this mon-ster piece of machinery. 52 In June, 1906, the City Council ofChicago passed an ordinance requiringthe Baltimore & Ohio Railroad to elevateits roadbed over the streets on each sideof the Calumet River. Th
. Baltimore and Ohio employees magazine . o. 8, the first passenger train to use thethe new structure, crossed at bridge is the largest single leafBascule span in the world, the movablespan being 235 feet long. Thirteen hun-dred and fifty tons of structural steel, onehundred and fifty tons of machinery, andtwenty-two hundred tons of concretecounter weight go to make up this mon-ster piece of machinery. 52 In June, 1906, the City Council ofChicago passed an ordinance requiringthe Baltimore & Ohio Railroad to elevateits roadbed over the streets on each sideof the Calumet River. This would havenecessitated the raising of existing drawspan at the Calumet River, but in Jan-uary, 1910, the War Department of theUnited States Government ordered therailroads crossing the Calumet River atthis point to provide a better channel forthe passage of boats. A clear channel of140 feet was demanded in place of the oldchannel of eighty-five feet. This order,of course, made necessary the construc-tion of an entirely new A. FIELD, ASSISTANT ENGINEER OF BRIDGESAND BUILDINGS ■mi: : wn oiiio i:mim,()Vi:s m\(;.\/ixk 53 There existed tit the (M-ussiiiu; in \\)\()throe draw ypans whieii carried the tracksof the Baltimore cV: Ohio, L. S. ct M. the P. F. W. & C, bridges, when o])ened, only clearcMleach other at the ends l)y a few method of building the new bridges,therefore, had to ))e carefully worked outin order that traffic over the old bridgf^sshould not be interrupted.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbaltimo, bookyear1912
