The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 589
ched on to drive the other bobbin, so as toreproduce the sounds. It has been proposed to use the instrument for the recording 56° PRACTICAL TELEPHONE HANDBOOK of conversations held over an exchange telephone line, thechief idea being that, if a subscriber is absent, the fact ofhis bell being rung… … Fig- 505.—Steljes Typewriting Telegraph such use of the instrument—one of which is that, whilst the re-productions are remarkably clear and free from extraneousnoises, the sounds are comparatively faint, so that, unless thereare very favourable conditions in recording, the reproductionsare too…
Telephone
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