The Wonders of Wireless Telegraphy Explained in Simple Terms for the Non Technic
The Wonders of Wireless Telegraphy Explained in Simple Terms for the Non Technic
John Ambrose Fleming
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119 rapidly, but it cannot permit the steady or uniform flow of a current because the glass or other insulator which forms the condenser is a non-conductor for such steady currents. Nevertheless since the jar or the con- denser can be charged with electricity and then discharged and charged in the opposite direction, we may say that it has a conductivity for alternating electric currents, but not for direct or continuous currents. Moreover, such a condenser in series with a coil, possesses a pa...rticular time period of electrical oscillation of its own, in the sense that if its electric charge is dis- turbed by a sudden electromotive force, the charge oscil- lates with a certain frequency depending on the electric capacity of the condenser and on the electric inertia or inductance of the coil. We have already in Chapter II. Given the rule which enables us to calculate this time period of oscillation when the capacity of the condenser and inductance of the coil forming the oscillation circuit are known.
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