Electrical engineer's pocket-book: a hand-book of useful data for electricians and electrical engineers (1901)
Foster, Horatio A. (Horatio Alvah), 1858-1913 · New York, D. Van Nostrand co.; London, E.& F.N. Spon, ltd. · leaf 658
which was quite a suc-cess as a loud-speaking instrument, and wasdoubtless the forerunner of the modern trans-mitters. The instrument consists of a buttonof lamp-black, compressed between two metalplates to which the conductors are connected,Fia. 2. Edison Carbon with a battery in circuit. An ivory… … 646 TELEPHONY. with the microphone, that the maximum effect is produced when the contactwith or between the particles of the carbon is a loose one. He showed manybeautiful experiments with that crudely made instrument which is shownin principle and as used in the following cuts.
Electrical engineering
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