An hour-glass,a modern reproduction of an ancient device used to measure time. This technique of telling the time depended on the flow of a known volume of material (such as a fine sand) through a small opening. Hour-glass vertical: pink & blue starry background | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Craddock, Tony |
Bildgröße: | 3383 px × 4299 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |