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Transmission of Power

the plies the energy. The revolving shaft of a screw steamer transmits rotary motion through a considerable distance; but mechanical devices, if they do not altogether fail, lose greatly in efficiency. for long distance transmission ordinary Cable cars also form a good illustration. the most promising agent for indefinite transmission of power. Thus a dynamo- It is in electricity, however, that we find waterfall; its voltage or potential may electric machine may be worked by a be transmitted along wires to distant electric machine may be worked by a stations, and there transformed into cur- be transmitted along wires to distant and keeping a whole factory in operation. rents capable of driving an electric motor current generated by Niagara Falls is in Over 60,000 horse power of electric Niagara Falls and in Buffalo, N. Y., 26 use in the many factories established at railways, grain elevators and manufacmiles away. In the latter city street which is brought to the outskirts of the city over bare copper wires, and then turing plants are run by this current, distributed through the city in underground conduits. ployed by a government for carrying soldiers, warlike stores, or provisions from one place to another. At the beginning of the American-Spanish War the ning of the American-Spanish War the United States had no ships of this class.

United States had no ships of this class.