Question

Who invented seismograph ?

1. Chang heng

2. Zhang heng​

Answer 1

Answer:

Around 132 CE, Chinese scientist Chang Heng invented the first seismoscope, an instrument that could register the occurrence of an earthquake called a dragon jar. The dragon jar was a cylindrical jar with eight dragon heads arranged around its brim, each holding a ball in its mouth. Around the foot of the jar were eight frogs, each directly under a dragonhead. When an earthquake occurred, a ball dropped from a dragon's mouth and was caught by the frog's mouth.

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Answer 2

Answer:

chang heng

is the correct answer.......