ut 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 mason work Is finished. compartment similar to those into… … and, if a pier, the work carried on until the entire space is ROCK OR SOLID BEO filled. To extend the masonry further out into the water, cipal feature of the invention is the system of plaie piles point of economy and convenience, which will doubtless be the piles are raised, and the dam floated…
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