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China was susceptible to frequent earthquakes, so a seismograph invented under t

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China was susceptible to frequent earthquakes, so a seismograph invented under t

China was susceptible to frequent earthquakes, so a seismograph invented under the Han Dynasty used which of these mechanisms?
a.   a suspended weight moves a lever which drops balls into a frog’s mouth
b.   a magnetic arm moves a writing instrument across a piece of parchment
c.   specially colored wooden dragons float in a vat of colored water
d.   two chemicals are separated inside an urn; when shaken they produce a distinct glow

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6eculus

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fx-82 Author

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9 years ago

Very nice, thanks!

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6eculus

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9 years ago

This was a tough question, glad it was right.

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