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