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Early Corporate History
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amplifier antenna apparatus application arrangement AT&TCo attenuation automatic basic battery became Bell Laboratories Bell System Bell Telephone Bell Telephone Laboratories broadcasting cable capacitors carrier central office Chapter circuit coils commercial common-battery communication connected cord circuits cores crosstalk device dial diaphragm direct current early efficiency electron Engineering Department equipment exchange frequency hertz improved inductance inspection installed instruments insulation introduced invention Laboratories large number later loading loading coils long-distance loop machine magnetic manual manufacture mechanical ment metallic noise open wire operator oscillator output pairs permalloy phantom circuit plant private branch exchange problem radio receiver reduced relay repeater repeating coil Section selector shown in Fig signaling speech standard station subscriber switchboard tandem techniques telegraph Telephone Company teletypewriter tests tion toll transmission transmitter trunks U. S. Patent vacuum tube voice voltage waves Western Electric Company