Gilley, Frank M · Boston, Allyn & Bacon · leaf 524
the centre ofthe coil. Then replace as before,and this time let both be free tomove. As might be expected,both move. If a person in oneboat pushes another boat, bothboats move. Galvanometers and galvano-scopes, as generally constructedto-day, belong to two classes, —one in which the needle moves,… … 591. The First Atlantic Cable, laid in 1859, consisted of a cop-per core covered with a non-conductor of rubber. The currentpassed through the copper core and returned through the earthor water of the ocean. The cable acted like an immense Leydenjar, or condenser of circular form. The copper inside…
Physics
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