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  1. Carbon microphone - Wikipedia

    • The first microphone that enabled proper voice telephony was the (loose-contact) carbon microphone (then called transmitter). This was independently developed around 1878 by David Edward Hughes in England and Emile Berliner and Thomas Edison in the US. Although Edison was awarded the first patent in mid-1877, Hughes had demonstrated his workin… See more

    Overview

    The carbon microphone, also known as carbon button microphone, button microphone, or carbon transmitter, is a … See more

    Current usage

    Apart from legacy telephone installations in various conditions according to areas and countries, carbon microphones may be still used today in certain niche applications although manufacturers are discontinuing distribution… See more

    Bibliography

    • Josephson, Matthew, Edison: A Biography, Wiley, 1992, ISBN 0-471-54806-5 See more

    External links

    Edison's invention of the carbon (graphite) microphone by Frank Dyer
    • T A Edison, U.S. patent 0,474,230 Speaking Telegraph (graphite microphone), filed April 1877, issued May 1892… See more

     
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