Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 311
ce. In telephony, an extension of the circuit arrangement,shown in Fig. 21, whereby two telephone circuits each withtwo repeating coils permit of the estabUshment of a thirdtelephone circuit, is much used for long-distance trans-mission. This third, or so-called phantom circuit, utiHzesthe two… … TO TELEPHONEAPPARATUS R
Telegraph
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