The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 91
Fig. 54.—Scale \ 6S PRACTICAL TELEPHONE HANDBOOK … Fig. 55.—Scale & vibration. Consequently, the amplitude of the vibrationswhich reach the ear is appreciablylessened. These disadvantages have ledto its gradual displacement by otherforms of receivers. UArsonval Receiver.—In most formsof the double-pole receiver each pole ofthe magnet is fitted…
Telephone
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