Archimedean Screws for raising water from one level to another. The 'thread' could be either external (as in Fig. 3),or the more conventional internal spiral in Fig. 2. From Ferguson's Lectures edited David Brewster,Edinburgh,1805 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / UIG / Universal History Archive |
Bildgröße: | 4682 px × 3732 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |