ear trumpets

diaphragm

3/4grilleearside
earpiece material
image of ear trumpet
gutta percha
image of ear trumpet
vulcanite
image of ear trumpet
vulcanite
image of ear trumpet
vulcanite
image of ear trumpet
leatherette

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