overed at Cambridge, Mass., in1877 by Prof. Alexander Graham Bell, the inventor ofthe telephone system which bears his name. On theoccasion mentioned Prof. Bell was experimenting toascertain how slight a ground connection could be hadwith the telephone. Two pokers had been driven intothe ground… … Scientific American of a clock, which after a time he was able to identify,by reason of certain peculiarities in the ticking, asthat of the electrical timepiece at Cambridge Univers-ity, the ground wire of which penetrated, the earth ata point more than half a mile distant. Some five years later…
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