The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 80
t HISTORY 57 to respond to speech, and were even so sensitive as to renderaudible the most minute sounds, such as those caused by thewalking of a fly, etc. The best effect was obtained withcarbon in one shape or another, that given in Fig. 41 being oneof the best forms. Two carbon blocks, c, c,… … Fig. 41 The complete instrument is shown in Fig. 42, and forms theparent of a very numerous class of telephone transmitters;indeed, nearly all transmitters in use are but modificationsor amplifications of some form or other of Hughes micro-phone. Edisons Loud-Speaking Receiver.—This was a very…
Telephone
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