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The Charles Herrold Water-Cooled
Carbon Button Microphone

Above, Gordon Greb, Charles Herrold and Mike Adams
share a 1912 Herrold Microphone. In 1958, Greb uncovered
the Herrold story. In 1995 Adams used the research for the
PBS Video, "Broadcasting's Forgotten father: The Charles
Herrold Story." Buy the Herrold book
The anatomy of an early broadcast microphone. Above, Herrold's original notarized 1912 drawings and the resulting 1913 U.S. patent.
The Microphone was disassembled and photographed, showing the 6-button-in-series configuration
Se a Herrold Broadcast
The Charles Herrold Collection is part of the Perham Collection at History San Jose

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