Although in a vacuum electric current can be expected to travel at nearly the speed of light, telegraph wires, particular those placed underwater, suffer from a retardation of the signals sent ...

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1. Wire.—Eighteen strands of seven inch wire. 2. Six strands of yarn. 3. Gutta percha.—Three coats. Telegraph wires.—Seven in number. The flexibility of this cable is so great that it is as ...

In December he sends messages by wire between two committee rooms in the U.S. Capitol, leading Congress to appropriate $30,000 towards construction of a telegraph line. Portuguese engineer Jose d ...

As a matter of fact, it is a decided advantage to place the station as far from town as possible, because buildings, trees, telegraph and telephone poles and wires, all tend to absorb a large part ...