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