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Image from page 201 of “Handbook of railroad construction; for the use of American engineers. Containing the necessary rules, tables, and formulæ for the location, construction, equipment, and management of railroads, as built in the United States ..” (18

Image from page 201 of

Identifier: handbookofrailro00vose
Title: Handbook of railroad construction; for the use of American engineers. Containing the necessary rules, tables, and formulæ for the location, construction, equipment, and management of railroads, as built in the United States ..
Year: 1857 (1850s)
Authors: Vose, George L. (George Leonard), 1831-1910
Subjects: Railroads — Design and construction Railroads — Equipment and supplies Railroads — United States Equipment
Publisher: Boston, Cambridge : J. Munroe and Company
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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178 HANDBOOK OF RAILROAD CONSTRUCTION. used unless the wood is well seasoned. The best plan is tothoroughly whitewash and cover the frame of the bridge,and to paint the article of the covering. 204. In framing two or more continuous spans, thechords should always be connected over the piers; as thereis thus given something for the upper chords to pullagainst, and a counter thrust for the lower. 205. Bridges should never, when it can be avoided, beplaced either upon a curve or upon a grade ; particularlyupon the former, as the effect of a load is thereby verymuch increased, in the first case causing a lateral, and inthe second a vertical shock. PILE BRIDGING. 206. In shallow water, in marshes, and in similar situa-tions, where an embankment would be expensive, pilebridging is very useful. Indeed, whenever we are at libertyto obstruct the passage beneath the road, it is well to adoptthis system, unless over twenty feet high. It is cheaperthan any other, easier to repair, the parts are q

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