Conversion tube,dating from around 1860,England. This device is made from ivory and cloth covered rubber. It was used to assist hearing; one person would talk into the funnel-shaped end of the tube and the narrower end would be placed in the listener's ear canal. The talker's voice was transmitted along the tube to amplify the sound | |
Licence : | Droits gérés |
Crédit: | Science Photo Library |
Taille de l’image : | 5443 px × 3576 px |
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