Three or four piers or sometimes bridges of masonry are run out into the bed of the river, frequently from both sides at once, raising the level of the stream and thus giving a water power sufficient to turn the gigantic wheel or wheels, sometimes almost 40 ft.
The credit for the success of the Conway and Britannia bridges must be divided between the engineers, Robert Stephenson and William Fairbairn, and used for railway bridges in England after the construction of the Conway and Menai bridges, and it was in the discussions arising during their design that the proper function of the vertical web between the top and bottom flanges of a girder first came to be understood.
Numerous regulating bridges and locks have been built to give absolute control of the water and facilities for navigation; and since 1901 a second weir has been constructed opposite Zilta, across the Damietta branch of the Nile, to improve the irrigation of the Dakhilia province.
A great part of the country, however, is still compelled to use the most primitive means of communication-mule paths, fords in the smaller streams in the dry season, and rude suspension bridges across deep gorges and swift mountain torrents.
DAVENPORT, a city and the county seat of Scott county, Iowa, U.S.A., on the Mississippi river, opposite Rock Island, Illinois, with which it is connected by two fine bridges and by a ferry.
In some recent masonry arched bridges of spans up to ' so f t.
Two ramparts, known as Trajan's wall, can be discerned, one on either side of the railway from Cernavoda to Constantza; and there were bridges over the Danube at Turnu Severin and Turnu Magurele.
Don't burn your bridges behind you.
Hence many of the earlier bridges have had to be strengthened to carry modern traffic. The following examples of some of the heaviest locomotives on English railways is given by W.
In bridges so erected the straining action during erection must be studied, and material must be added to resist erecting stresses.