Appletons' annual cyclopædia and register of important events of the year .. . e length of the bridge and approacheswill be 4,500 feet. The plan of the bridgeproper is a suspended girder, with parallel andcradled cables, and two decks. The girder,1,680 feet in length, will be of supporting towers will also be of wrought- ENGINEERING. 257 iron. The cables are to be of steel links andpins, which are required to posses a final break-ing strength of at least 80,000 pounds to thesquare inch, and which will be subjected to atension in the bridge of 20,000 pounds persquare inch. The
Appletons' annual cyclopædia and register of important events of the year .. . e length of the bridge and approacheswill be 4,500 feet. The plan of the bridgeproper is a suspended girder, with parallel andcradled cables, and two decks. The girder,1,680 feet in length, will be of supporting towers will also be of wrought- ENGINEERING. 257 iron. The cables are to be of steel links andpins, which are required to posses a final break-ing strength of at least 80,000 pounds to thesquare inch, and which will be subjected to atension in the bridge of 20,000 pounds persquare inch. The pins are to have the form ofa perfect cylinder between head and nut. Thelinks near the middle of the span will be 25 feet long between the centres of the eyes, andas they approach the towers are to be longerin such proportion that the horizontal distancebetween the eyes shall remain 25 feet. Thelargest links in their middle will not have agreater sectional area than eight inches. Thetowers below the track of the railroad will beformed of cells of wrought-iron, and above the. SUSPENSION-BRIDGE OVER THE EAST RIVER, BROOKLYN. X. T. track will have eight columns 80 feet high and11 feet in diameter. Each chamber in thelower tower will have twelve saddles and twopairs of compensating levers. These and theirattachments will be carried by a frame thatextends in both directions across the saddle-chambers and over the heads of all the columnsof the tower. All the parts of the saddles andthe lever attachments for the stay system willbe worked in together upon this frame; and sothat the parts will move together sufficiently tocompensate the expansion and contraction ofthe main back-stays beyond what the toweritself sustains. The saddles will move by steelrollers upon steel faces under the carrying-frame. The anchorage of the cables will be inthe solid rock at both ends. It is expectedthat this bridge will pave the way for a newrailroad to the West, with a route betweenNew York and Chicago
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Keywords: ., bookcentury1800, bookdecade1870, bookidappletonsann, bookyear1876
