This Conversation Tube was a later advancement from the rigid ear trumpet and allowed the user to point the business end at the speaker rather than having to turn their whole head in the direction of the speaker. This example has a vulcanite bell and earpiece joined by a coiled silk covered tube.
We once had one that came with the paperwork from the Veteran's Benefits Branch of the government supplying one for a WW1 vet. These tubes were in use from the late 19th century right up to 1920s although by that time they were old fashioned. The newer battery powered and amplified aids were just coming into popular use and were expensive and cumbersome.
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