. The American railway; its construction, development, management, and appliances . en false works, and serve as balancing weights to the otheror river arms of the lever, which project out over the river-arms were built by the addition of metal, piece bypiece, the weight being always more than balanced by the shore-arms. The separate members of the river-arms were run out onthe top of the completed part and then lowered from the end byan overhanging travelling derrick, and fastened in place by menworking upon a platform suspended below. This work was con-tinued, piece by piece, un
. The American railway; its construction, development, management, and appliances . en false works, and serve as balancing weights to the otheror river arms of the lever, which project out over the river-arms were built by the addition of metal, piece bypiece, the weight being always more than balanced by the shore-arms. The separate members of the river-arms were run out onthe top of the completed part and then lowered from the end byan overhanging travelling derrick, and fastened in place by menworking upon a platform suspended below. This work was con-tinued, piece by piece, until the river-arm of each cantilever wascomplete, and the structure was then finished by connecting theseriver-arms by a short truss suspended from them directly over thecentre of the stream. This whole structure was built in eightmonths, and is an example both of a bold engineering work and ofthe facility with which a pin-connected structure can be materials are steel and iron. The prosecution of this workby men suspended on a platform, hung by ropes from a skeleton. The Niagara Cantilever Bridge Completed. Structure projecting, without apparent support, over the rushingNiagara torrent, was always an interesting and really thrillingspectacle. 92 FEATS OF RAILWAY ENGINEERING. The Lachine Bridge recently built over the St. Lawrence nearMontreal, illustrated below, has certain peculiar features. It has atotal length of 3,514 feet. The two channel spans are each 408 feetin length and are through spans. The others are deck spans. Through spans arethose where the trainpasses between theside trusses. Deckspans are thosewhere the trainpasses over the topof the two channel
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