A sketch by Leonardo da Vinci of a flying machine known as the 'helical air screw' or the 'airscrew'. It was designed to compress air to obtain flight, similar to modern helicopters. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Science Source |
Taille de l’image : | 5246 px × 3628 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |