all the for the support of bridges, yet a continuous merous plans have been devised for working iron cylinder sunk beneath the bottom of the principal cities and towns in the United States. water. A A A represent a series of these cy- and unbroken wall cannot so be made, as there der in 6 months. :… … tion of a coffer dam enclosing an equal area presents a longitudinal section ofan immerser mediately in the centre of the coffer is a small lowed to rise a space along the guide- post, and but it would serve the. purpose of any number coffer, with its shafts or entrances, and the hollow cylinder,…
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