Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 376
sh-ment in the loud-speaking Glower-Bell Telephone, used in theTelephone Exchange. The transmitter is a wooden plate, onthe under-side of which is suspended a microphone (Fig. 235)of peculiar form. The transmitter also contains a smallelectro-magnet, which is included with the microphone inthe… … Fig. 235. The inside is shown (Fig. 236, b), in which A is a strongpermanent magnet, over whose poles are two coils of wire
Electricity
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