Hourglass. This device uses the calibrated falling of sand from an upper chamber to a lower chamber to track the passage of time | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Llewelyn-Davies, Patrick |
Taille de l’image : | 3928 px × 4961 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |