. A treatise on nervous and mental diseases, for students and practitioners of medicine. hem back into the cell. Let us now place nearthese wires another wire, and in this wire we intercalate a milli-araperemeter, so that we can detect any current of electricity thatshall pass through this wire. At the moment when the currentpasses through the wires attached to the cell we shall see that theneedle of the milliamp^remeter intercalated in the wire fluctuates,indicating that a current of electricity is passing through this the wires do not touch, and it is evident that while thecurrent i
. A treatise on nervous and mental diseases, for students and practitioners of medicine. hem back into the cell. Let us now place nearthese wires another wire, and in this wire we intercalate a milli-araperemeter, so that we can detect any current of electricity thatshall pass through this wire. At the moment when the currentpasses through the wires attached to the cell we shall see that theneedle of the milliamp^remeter intercalated in the wire fluctuates,indicating that a current of electricity is passing through this the wires do not touch, and it is evident that while thecurrent in the milliampere wire is due to the passage of thecurrent in the battery wires, it is not due to the contact ofthe two wires. It must therefore be by induction without current is induced in one wire by the passage of a currentthrough a neighboring wire. The battery wire is called theprimary wire, and the milliampere wire is called the secondarywire. In this secondary wire the milliamperemeter is inter-calated. It is a curious fact that the current in the secondary Fig. Diagram illustrating the primary and secondary wire of a faradic battery.(From De Watteville.) wire is not observed while the current is quietly passing throughthe primary wire, but only at the moment when the current issuddenly turned on in the primary wire, or suddenly turned off inthe same. Let us suppose, therefore, that in the battery wire wehave a mechanical contrivance for turning on and turning off acurrent, for making or breaking the current, as it is technicallycalled, or interrupting it. It is evident that such an interruptionwill be a great convenience in producing a current in the secondarywire. This principle of induction and interruption constitutes thekey-note of the faradic battery, and hence we can understand whyit is called the interrupted current, in contradistinction to the steadilyflowing current of the galvanic battery. In every faradic battery,therefore, there is a device f
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