The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 596
his very much affected, being so much distorted that it may notbe understood at the receiving end. One of the most pro-mising systems is that in which the mercury vapour-lamp ofMr Cooper Hewitt is used, as shown in Fig. 512. On speak-ing into the transmitter the speaking currents traverse thecoils… … Fig. 513. -W. E. Co.s Auto-Call Box Connections for2d. and 3d. Fees of the vapour arc, and intensified speech currents pass throughthe receiver shown. This arrangement is not yet in a practicalform, as it can only be worked in one direction. Automatic Call Boxes.—In all towns having a…
Telephone
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