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M.Boudet
Boudet Microphone, 1881
Scientific American February 5, 1881
The mouthpiece contains an ebony plate one millimeter thick, on which is fixed a piece of copper, Ml, penetrating the glass tube a slight distance. In this tube there are six carbon balls slightly smaller in diameter, so that they can easily be moved.
Boudet's Microphone
February 5, 1881 Scientific American
NEW MICROPHONE.
BY M. BOUDET, OF PARIS.
This microphone, with multiple contacts, as shown in the accompanying figure, is composed of a mouthpiece, E, affixed to the end of a glass tube, T, one centimeter in diameter, itself fixed on a jointed stand, thus enabling the whole apparatus to be moved at any inclination.