I want to know the answer to the following question:
How many dragons were represented in Zhang Heng's invention of the seismometer?
All the background I'm provided with is that "Zhang also invented a seismometer (Houfeng didong yi 候风地动仪) in 132 AD to detect the exact cardinal or ordinal direction of earthquakes from hundreds of kilometers away.". Is that enough to answer the question?
Answer: no