Crushing gold bearing ores in mills similar in principle to flour mills. Bottom left goats in treadmill: horizontal power transferred to mill,A,through crown-and-pinion. Bottom right men turn capstan and power transferred through tooth-and-pinion. From Agricola De re metallica Basle 1556. Woodcut | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / UIG / Universal History Archive |
Bildgröße: | 3225 px × 5419 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |