Tunzelmann, George William von, 1856- · New York, Scribner & Welford · leaf 95
typical form. It con-sists of two hollow metal cylindersprovided with teeth, and fixed upona solid insulating cylinder, the teethof either cylinder projecting betweenthose of the other without touchingthem, as is shown in the illustra-tion. The two collecting brushesare fixed so that one is always… … CHAPTER IX. THE STORY OF THE TELEGRAPH. Some of the descriptions which have come down to us ofthe manner in which the decrees of the old Roman oracleswere communicated to those who consulted them, irresist-ibly suggest that magnetism was one of the agents employedby the priests to deceive their…
Electric industries · Electricity
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