1. The double button carbon microphone with stretched diaphragm was a marked improvement. 2. The carbon microphone was further improved by Emile Berliner, Anthony White. 3. Carbon microphones were widely used in telephones from 1890 until the 1980s.4. Their first experiment used a carbon microphone . 5. To modulate this transmitter he inserted a carbon microphone in series with the supply lead. 6. Old handsets manufactured before 1985 using a carbon microphone transmitter are not sensitive to polarity. 7. Edison used the carbon microphone concept in 1877 to create an improved telephone for Western Union. 8. The carbon microphone remained standard in telephony until the 1980s, and is still being produced. 9. The carbon microphone was also used in radio broadcasting and public address work through the 1920s. 10. In 1879, the Bell company acquired Edison's patents for the carbon microphone from Western Union.
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