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Boudet's microphone.

Boudet's microphone: this consisted of a glass tube 3ins long and 0.4 ins in diameter. Copper cylinder, M was connected to membrane of rubber (D) at one end and to six carbon balls at the other. Screw at V was used to adjust pressure of contact between balls. Dated 1882.
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Titre:
Boudet's microphone.
Légende: Voir la traduction automatique
Boudet's microphone: this consisted of a glass tube 3ins long and 0.4 ins in diameter. Copper cylinder, M was connected to membrane of rubber (D) at one end and to six carbon balls at the other. Screw at V was used to adjust pressure of contact between balls. Dated 1882.
Crédit:
Album / Universal Images Group / Universal History Archive
Autorisations:
Modèle: Non - Propriété: Non
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Taille de l'image:
4220 x 4969 px | 60.0 MB
Taille d'impression:
35.7 x 42.1 cm | 14.1 x 16.6 in (300 dpi)
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