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 ...

Telegraph wires wrapped around spike and sledgehammer transmitted the impact instantaneously east and west. In San Francisco and New York, wires had been connected to cannons facing outward across ...

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 ...

The largest solar storm on record lit up skies around the globe in the 1850s - but New Zealand, a technological backwater, escaped the worst of it.