Pendulum with mercury compensation (carrying a glass cylinder almost full of mercury) allowing for more accurate timekeeping. The upward expansion of the mercury counterbalances the downward expansion (from heat) of the pendulum | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / NYPL / Science Source |
Taille de l’image : | 1557 px × 7473 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : |
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