Français : Sismographe inventés en l'an 132 Après JC, après plusieurs graves tremblements de terre en Chine, par l'astronome Zhang Heng, pour avertir les gens qu'un séisme était en cours ou en préparation. Quand la terre tremblait, même faiblement, un pendule suspendu au couvercle bougeait à l'intérieur du vase. Le pendule poussait ou frappait un des levier ouvrant la bouche d'un des dragons. Une bille placée dans la bouche du dragon tombait alors dans celle du crapaud ci-dessous, donnant l'alarme. La seule bouche ouverte dragon donnait la direction du tremblement de terre, qui était alors notifié à l'empereur
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