The triple expansion
engines, having each a bronze screw of 4.42 meters diameter, with
three blades and a rise of 6.3 meters, make with natural draught 105
revolutions, and with forced draught 120. The pumping apparatus are
able to lift in one hour 400 tons of water. The front boiler room
contains a special cylindrical boiler for the working of the
electrical apparatus, for hydraulic pumps of the artillery service,
for anchor windlasses, ventilators, fire engines, etc. The whole
engines weigh 890 tons. The bunkers have a capacity for 660 tons of
coal, which allows for a run of 4,500 sea miles.
* * * * *
CLARK'S GYROSCOPIC TORPEDOES.
Figs. 1 and 2 represent, upon a scale of about 1/10, two types of
torpedoes, the greatest number possible of the parts of which are made
revolvable, so as to render the torpedoes as dirigible as the gyrating
motion permits of.
Fig. 1 represents an electric torpedo actuated by accumulators, A A,
keyed upon the shaft, and revolving along with the gearings. At the
beginning of the running, the accumulators are not all coupled, but
under the action of a clockwork movement which is set in motion at the
moment of starting, metallic brushes descend one after another upon
the collectors, B, and set in action new batteries for keeping
constant or, if need be, accelerating the speed at the end of the
travel.
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