The girders
are braced together and carry the framing for the bucket chains,
gears, etc.
The port vessel is provided with a compound engine of 150 indicated
horse power, with injection condenser actuating two powerful
centrifugal pumps, raising water which enters by a series of holes
into the bottom of the shoots underneath the dredged material,
carrying the material to the conduit (as indicated on Fig. 4 and in
detail on Figs. 6 and 7).
A steel boiler of 80 square meters (860 square feet) heating surface,
and 6 atmospheres (90 lb.) working pressure, supplies steam to the
engine. Forward on the deck of the same vessel there is a vertical
two-cylinder high pressure engine of 30 indicated horse power, which
helps to bring the barge to the desired position between the parallel
vessels. A horizontal two-cylinder engine of the same power, fitted
with reversing gear, placed in the middle of the foremost iron girder,
raises and lowers the bucket ladder by the interposition of a strongly
framed capstan, as shown on Fig. 5. The gearing throughout is of
friction pulleys and worm and wormwheel. It is driven by belts.
In the starboard vessel there is a compound engine of 100 indicated
horse power, with injection condenser, working the bucket chain by
means of belts and wheel gearing, as shown on Fig. 2. A marine boiler
of 46 square meters (495 square feet) heating surface and 6
atmospheres (90 lb.) working pressure, supplies steam.
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