Electricity simplified. The practice and theory of electricity .. (1891)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · New York, N. W. Henley & co. · leaf 145
d,almost all depending on loose carbon contacts. Asimple form is shown in the illustration. In it C Care blocks of carbon between which a spindle of car-bon A is sustained in very loose contact. The base 144 ELECTRICITY SIMPLIFIED. X Y are the D serves to support the instrument,ends of the line… … Fig. 29.—Microphone. the central office and the other subscriber actuates asmall magneto-electric generator, which rings thebell, calls up the operator at the central office, and,when contact is made, rings the bell at? the receiversinstrument. The whole telephone system, it will be…
Electricity
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