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 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Hks, Gary |
Bildgröße: | 3780 px × 2953 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |