Henry Hunnings
Encyclopedia
Henry Hunnings was a British clergyman and inventor from Bothwell, Yorkshire. Hunnings received a patent on September 16, 1878 for a new type of carbon microphone
(then called transmitters) for use with telephones.
The Hunnings transmitter provided multiple contacts between the diaphragm and a chamber containing loosely packed carbon granules. The Hunnings transmitter produced a stronger voice signal than the Bell electromagnetic transmitter and was therefore more practical for long distance communication. The Hunnings patents were purchased by the Bell Telephone company which improved and manufactured more than 10,000 transmitters of the Hunnings design after which it was replaced by the White "hard-back"
transmitter.
Carbon microphone
The carbon microphone, also known as a carbon button microphone or a carbon transmitter, is a sound-to-electrical signal transducer consisting of two metal plates separated by granules of carbon. One plate faces outward and acts as a diaphragm...
(then called transmitters) for use with telephones.
The Hunnings transmitter provided multiple contacts between the diaphragm and a chamber containing loosely packed carbon granules. The Hunnings transmitter produced a stronger voice signal than the Bell electromagnetic transmitter and was therefore more practical for long distance communication. The Hunnings patents were purchased by the Bell Telephone company which improved and manufactured more than 10,000 transmitters of the Hunnings design after which it was replaced by the White "hard-back"
Anthony C. White
Anthony C. White was an electrical engineer who improved the carbon microphone for use with telephones manufactured by the American Bell Telephone company....
transmitter.