File:Canadian Pacific Railway bridge over Fraser River (1901).jpg

Identifier: railwaylocomotiv19newy Title: Railway and locomotive engineering : a practical journal of railway motive power and rolling stock Year: 1901 (1900s) Authors: Subjects: Railroads Locomotives Publisher: New York : A. Sinclair Co Contributing Library: Carnegie Library of Pittsburgh Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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Text Appearing Before Image: r in Burma 335 *4-6-2 for the B. & 0 329 Locomotive Engineer, To Become a 319 Our Correspondence School 321 Personals 333 •Statue of Baldwin 305 RffiGi!?^,rEn$iiieerin$ Copyright by Angus Sinclair O).—1906 A Practical Journal of Railway Motive Power and Rolling Stock Vol. XIX. 136 Liberty Street, New York. August. 1906 ^^. 8 Cantilever Bridges. separately or bntli together, always ex- lever, and as it plays a very important Probably the oldest form of bridge in rts a downward thrust on the abut- part in the make-up of the bridge, the the world was the trunk of a fallen tree nients or piers of the bridge. name is applied to that class of brirlges stretching across a narrow gorge, and The cantilever bridge, however, mod- which contain cantilevers, the familiar example of a plank thrown ifics this original conception and has in- The typical form of cantilever bridge across a stream is for most people the troduced another principle into bridge is represented in the diagram Fig. i.

Text Appearing After Image: C.\NTILEVER BRIDGE OVER THE ERASER RIVER, C. P. R.. IlKITISH COLUMBIA. fundamental conception of bridge con-struction. It is in essence a beam sup-ported at each end and carrying what-ever load may be put upon it, along itsupper surface. The form of the bridgemay vary from the old stone arch to themodern steel girder, but one generalconception prevails in most minds, andthat is, that the pressure of the struc-ture itself, and of the load it carries. construction. It is briefly that the re-action of the load on such a bridgecauses, not a downward, but an upwardpressure at the abutments or shore ends.The word by which this newer form ofstructure is described is made up withtlie first syllable cant, which here sig-nifies an inclination from the horizontal,or a slope or set. The cantilever is thusnothing more or less than a sloping and this shows two towers supportinghorizontal girders each somewhat re-sembling the upright stem of the letterT,. with an evenly balanced crosspieceon top. In

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