. Railway and Locomotive Engineering. placing of the two408 ft. spans, which will complete fullythe west side of the bridge. The hugespans are at present being erectedat the yards of the Dominion BridgeCompany, which are in close proximityto the bridge, connected by a spur soon as this is finished the spanswill be re-erected on the finished deckplate portion of the bridge on theCaughnawaga side of the stream, wherespace sufficient in length has been leftfor the purpose. It is expected that the work whichhas to be done before the bridge isfinally completed for double track serv-ice, wil
. Railway and Locomotive Engineering. placing of the two408 ft. spans, which will complete fullythe west side of the bridge. The hugespans are at present being erectedat the yards of the Dominion BridgeCompany, which are in close proximityto the bridge, connected by a spur soon as this is finished the spanswill be re-erected on the finished deckplate portion of the bridge on theCaughnawaga side of the stream, wherespace sufficient in length has been leftfor the purpose. It is expected that the work whichhas to be done before the bridge isfinally completed for double track serv-ice, will occupy at least another twelvemonths. The work of floating in thefour huge spans will almost occupy asmuch time as the rest of the bridge hasdone. These through channel spansare not of the cantilever type, but thestrength of the bridge will be below,and when the work is finished thebridge will constitute one of the finestpieces of engineering work on the con-tinent. The two flanking spans on thesouth side are practically END OF PIERS OF THE NEW BRIDGE. It is interesting to note that in thenew bridge there are no less than 8,-072,252 lbs. of steel. The run 110,000 lbs., the 120s 226,-000 lbs., the 240s 960,000 lbs., the 270s1,324,138 lbs., and the 408e 2,600,000 lbs. beptember, 1912. RAILWAY AND LOCOMOTIVE ENGINEERING. 325 Questions Answered LUBRIC.\TION. 199. D. M., Villa Grove, 111., writes:Why is it that the superheater construct-ors design the lubricating apparatus sothat there is about four times the amountof oil fed to the valve chests that there isto the cylinders, when the cylinders haveat least 95 per cent, more wearing sur-face? A.—The lubrication of the cyl-inders in all locomotives depends largelyon tlie amount of oil admitted to thesteam chest or valve chest, as the oil im-mediately passes from the valve chest intothe cylinders. On locomotives equippedwith superheaters a limited auxiliary sup-ply is admitted into the cyli
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