ated at A in Fig. 2, and it during the late war. The shell that burst the gun ber of the caisson had been built, launched, and was in has a continuous slot over which fold flap valves weighed 273 pounds without the explosive, which con- position between two rows of heavy guide piles, tied riveted… … piston B and the tube A, and so much was 2 feet under water, but the cut- of the valves as is necessary to be ting edge was not quite on the river spread apart will be relieved of air bed. The caissoiu was suspended at sisted of 16144 pounds of dynamite, the shell being 9 pressure, thus reducing…
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