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Meaning of 候风地动仪

Lookup via: Pinyin | Radicals
hòu fēng dòng (Trad.: 候風地動儀)
the world's first seismograph invented by Zhang Heng 张衡 in 132
Example Sentences
1
132
In 132 AD, in the then national capital of Luoyang, Zhang Heng made the ancient seismograph to determine the direction of an earthquake.