Wrist-watch. Coloured X-ray of a 17-jewel wrist- watch,showing the internal mechanism. Internal cogs and gears of the watch escapement can be seen. Some of the small circles contain ruby jewels used in bearings. An escapement is a device within a watch which provides periodic impulses to the balance wheel that helps to regulate time- keeping. Jewels,whether natural or man-made,are used in watch bearings because their smooth surfaces offer little friction resistance and are hard-wearing | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Roberts, D. |
Taille de l’image : | 1800 px × 2400 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |