Model of David Hughes's experiment of 1876,involving three nails and connecting wires on wooden board,acting as sound detectors | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Dorling Kindersley / UIG |
Taille de l’image : | 3838 px × 4554 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |