Tunzelmann, George William von, 1856- · New York, Scribner & Welford · leaf 173
y Du Moncel in 1866, that an increase of pressurebetween two conductors in contact causes a diminutionin the electrical resistance of the circuit of which theyform a part. E is an ebonite mouthpiece, D a vibratingplate, and I a disc of prepared carbon about the size of ashilling, the distance of… … Fig. 48. set in vibration by speaking to it, the vibrations are com-municated to the carbon by means of the small platinumplate; and the variations of pressure produced in thisway cause a variation in the electrical resistance of thecontact, and therefore set up a series of undulations ina battery…
Electric industries · Electricity
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