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But Deprez had employed a motor-dynamo of 2,000 volts, and was contented with a yield of 32 per cent. only of the energy imparted to the primary machine, whereas he had calculated at the time upon an electromotive force of 200 volts, and upon a return of at least 40 per cent. of the energy imparted.
To be more explicit, a submersible has a mechanical process, a combination motor and dynamo between the engine, which drives the boat when it is on the surface, and the thrust block through which the shaft runs to the propeller. This motor-dynamo, serving as a motor, drives the boat when she is beneath the water.
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