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A disassembled Ericsson carbon microphone with carbon particles visible. The carbon microphone, also known as carbon button microphone, button microphone, or carbon transmitter, is a type of microphone, a transducer that converts sound to an electrical audio signal. It consists of two metal plates separated by granules of carbon.
Francis Blake was born in Needham, Massachusetts on December 25, 1850, the son of Caroline Burling (Trumbull) and Francis Blake, Sr. [1]. In 1879, he invented a carbon microphone for use in the telephone, and patented [2] [3] [4] it shortly after Thomas Edison invented a similar microphone that also used carbon contacts.
British-American. Known for. Teleprinter, Microphone, Early radio wave detection. David Edward Hughes (16 May 1830 – 22 January 1900), was a British-American inventor, practical experimenter, and professor of music known for his work on the printing telegraph and the microphone. [3] He is generally considered to have been born in London but ...
The carbon microphone was critical in the development of telephony, broadcasting and the recording industries. [13] Thomas Edison refined the carbon microphone into his carbon-button transmitter of 1886. [10] [14] This microphone was employed at the first radio broadcast ever, a performance at the New York Metropolitan Opera House in 1910. [15]
The carbon microphone 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 working device in front of many witnesses some years earlier, and most historians credit him with its invention.
Alexander Graham Bell was awarded the first U.S. patent for the invention of the telephone in 1876. Elisha Gray, 1876, designed a telephone using a water microphone in Highland Park, Illinois. Tivadar Puskás proposed the telephone switchboard exchange in 1876. Thomas Edison invented the carbon microphone which produced a strong telephone ...
Kruesi was also an inventor, while at the Electric Tube Company, he devised a two wire conduit in which two semicircular conductors were separated by an insulator and covered in insulating material. Kruesi became assistant general manager of the lower Manhattan Edison Machine Works in 1894. [2] The Edison Machine Works moved to Schenectady, NY ...
Bell Company engineers made numerous other improvements to the telephone, which emerged as one of the most successful products ever. In 1879, the company acquired Edison's patents for the carbon microphone from Western Union. This made the telephone practical for longer distances, and it was no longer necessary to shout to be heard at the ...
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