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Updated: May 19, 2025
When, however, this balance of induction is upset by bringing a piece of metal say, a coin near one or other of the coils S S1, a sound will be heard in the telephone. The induction balance has been used as a "Sonometer" for measuring the sense of hearing, and also for telling base coins.
The external neutrality that we can now produce at will is absolute, as it crosses the line of two contrary polarities, being similar to the zero of my electric sonometer, whose zero is obtained by the crossing of two opposing electric forces.
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