Chinese earthquake detector,artwork

Numéro d’image : 11905534
Chinese earthquake detector,artwork
Chinese earthquake detector,artwork. This device was invented around 132 A.D.,by Zhang Heng. It consists of a copper-domed urn with dragons' heads circling the outside,each containing a bronze ball,and a pendulum hung from its top inside. When the Earth shook,the pendulum would swing,knocking a ball from one of the dragon heads into the open mouth of a bronze toad below. The direction of the earthquake's epicentre could be determined from which ball had been released
Licence : Droits gérés
Crédit: Science Photo Library / Hks, Gary
Taille de l’image : 3780 px × 2953 px
Model Release : Non requis
Property Release : Non requis
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