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 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library |
Bildgröße: | 5443 px × 3576 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |