An Elementary Course of Civil Engineering for the Use of Cadets of the United S

Cover An Elementary Course of Civil Engineering for the Use of Cadets of the United S
An Elementary Course of Civil Engineering for the Use of Cadets of the United S
Dennis Hart Mahan
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Turning-bridges may be made either of timber, or of cast iron ; the latter material is the more suitable, as admitting of more ac- curacy of workmanship, and not being liable to the derangements caused by the shrinking or warping of frame-work of timber.
628. Rolling-bridges. These bridges are placed upon fixed rollers, so that they can be moved forward or backward, to inter- rupt, or open the communication across the water-way. The part of the bridge that rests upon the rollers, when the passa
...ge is closed, must form a counterpoise to the other. The mechan- ism usually employed for manoeuvring these bridges consists of tooth-work, and may be so arranged that it can be worked by one or more persons standing on the bridge. Instead of fixed rollers turning on axl :-s, iron balls resting in a grooved roller-way AQUEDUCT-BRIDGES. 269 may be jsed, a similar roller-way being affixed to the fi . Me-work beneath.
629. Boat-bridge. A moveable bridge of this kind may be made by placing a platform to form a roadway upon a boat, or a water-tight box of a suitable shape.


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