Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Fig. 296.—Apparatus to Illustratethe Principle of theMicrophone. 328 PRACTICAL ELECTRICITY. are two carbon buttons one of which is fastened to a thinpine wood sounding board and the other to a brass spring, S,which causes B to touch A. The buttons are connected incircuit with a telephone and battery. While the current isflowing the least motion, caused by sound waves or othermeans, will vary the contact resistance between the buttons,and thus vary the current strength in the telephon
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Fig. 296.—Apparatus to Illustratethe Principle of theMicrophone. 328 PRACTICAL ELECTRICITY. are two carbon buttons one of which is fastened to a thinpine wood sounding board and the other to a brass spring, S,which causes B to touch A. The buttons are connected incircuit with a telephone and battery. While the current isflowing the least motion, caused by sound waves or othermeans, will vary the contact resistance between the buttons,and thus vary the current strength in the telephone induced currents in the telephone cause the disc toreproduce the original sounds. The telephone may be locatedat a considerable distance from the microphone, when thereproduced sound, as the ticking of a watch, will be asaudible as though produced close to the ear. 312. The Blake Microphone Transmitter. — The in-duced electric currents set up by the human voice in the Bell Seconoary ,__.
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