|The Carbon-Button Microphone|
In certain configurations, carbon-buttons can behave as if they have built-in amplifiers, not only converting sound into voltage but also increasing the strength of that voltage before it leaves the mic.
|Berliner Sits In Front Of His Carbon-Button Mic|
Phillips Thomas invented an “ultra-audible” microphone in the 1920s, while working for Westinghouse Electric. The name derived from Thomas’ claim that the device was sensitive enough to detect vibrations outside the range of human hearing.
|The "Ultra-Audible" Microphone|
The hookah-like tube connects this anonymous businessman to a dictaphone, the first technology for nonprofessional recording, used primarily in offices to take dictations.
Pioneering journalist Janet Flanner reads for the program "Listen: The Women,” broadcast from Paris shortly after the city was liberated in 1944. She’s speaking into an RCA 77 ribbon microphone, a standard of early broadcasting that has become a favorite of modern recording engineers.
|Janet Flanner Speaks Into An RCA 77|