ear trumpets

diaphragm

3/4grilleearside
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image of ear trumpet
c 1888
image of ear trumpet
c 1890
image of ear trumpet
c 1901
image of ear trumpet
c 1905
image of ear trumpet
c 1909

Among the many different designs there was quite a movement for the use of diaphragms.

A resonating diaphragm is unlikely to help the user.

But sometime the placebo affect was enough to convince the user that the trumpet was worthwhile.

The Ayleworth example is the only known one worldwide.
5 examples