Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 38
e diaphragm vibrates,the pressure at the point of contact, a, Fig. 14, becomes greater orless, thus varying the resistance of the contact and causing corre-spoiiding undulations in the current flowing. , - ■ Soon after this Edison devised an instrument using carbon as themedium for varying the…
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