Using a speaking trumpet to communicate on deck of a ship. Within limits,the larger the trumpet the further the voice will carry. From ''Natural Philosophy'' by A. Ganot,London,1887 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / UIG / Universal History Archive |
Taille de l’image : | 5100 px × 3513 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |