The homacoustic speaking tube. This model had both mouthpiece and earpiece which made it unnecessary to change position when speaking or listening to someone elsewhere in the building. Dated 1892.

The homacoustic speaking tube. This model had both mouthpiece and earpiece which made it unnecessary to change position when speaking or listening to someone elsewhere in the building. Dated 1892.
SuperStock offers millions of photos, videos, and stock assets to creatives around the world. This image of The homacoustic speaking tube. This model had both mouthpiece and earpiece which made it unnecessary to change position when speaking or listening to someone elsewhere in the building. Dated 1892. by Image Asset Management/World History Archive is available for licensing today.
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DETAILS
Image Number: 1746-111348757Rights ManagedCredit Line:Image Asset Management/World History Archive/SuperStockCollection:Image Asset ManagementModel Release:NoProperty Release:NoResolution:5397×3886
communication
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electrical|
electricity|
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