What Zhang Heng’s seismoscope is made of
A bronze vessel with balls that showed the direction of an earthquake.
- Ancient bronze vessel — has part. A hull.
- Bronze dragon heads holding balls — has part. Eight directions.
- Bronze toads with open mouths — has part. They catch the ball when it drops.
- Pendulum — has part. An internal pendulum (according to reconstructions).
- Pendulum — uses. An internal pendulum (according to reconstructions).
- Bronze — is made of. A bronze vessel.