upports, piers, sea walls, or other tion for the construction of a pier, the dotted lines indicating verse screw clamping rods, F, Fig. 2, solidly held. the depth of the structure. The forward portion is shaped marine structures. It is formed of watertight compartments The removal of the earth… … WALSH'S COFFER DAM. another, are'filled with air only; but when it is desired to clear of the decks, returning the same on top of the tunnel two hinged gates, formed of metal, and each constituting a locate the dam, water is admitted into the sections, causing arch, as shown in Fig. 2, after the…
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