Lessons in elementary physics / by Balfour Stewart.

  • Balfour Stewart
Date:
1895
Catalogue details

Licence: Public Domain Mark

Credit: Lessons in elementary physics / by Balfour Stewart. Source: Wellcome Collection.

    473/502 page 453
    If the circuit, which may he a lonjf one, liave at the one end a microphone and at the olhera tcleplione, sonorous vibrations takinsaf place neai' the microphone will produce variable or intermittent currents, which al the other cml will, by means of the telephone, reproduce sonorous vibrations similar to those which orig-inally excited them. So great is the delicacy of this arrangement, that sounds quite imperceptible to the human ear, may be rendered <lis- Imctly audible at the distance of many miles. 443. The Induction Balance. Ilughes is likewise the inventor of this instrument. Its principle of action maybe explained as follows : 11 two separate second.ary coils s, and s., (see Fig. i:i) winch might to he at least half a metre .apart, are joineii together in such a manner that the current induced by
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