Solar measuring machine,1860. Engraving showing an heliograph instrument being used to measure the total solar eclipse on 18th July 1860 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Royal Astronomical Society |
Bildgröße: | 4961 px × 3557 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |