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.

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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DETAILS
Image Number: 1746-111348798Rights ManagedCredit Line:Image Asset Management/World History Archive/SuperStockCollection:Image Asset ManagementModel Release:NoProperty Release:NoResolution:4220×4969
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