the world's first seismograph invented by Zhang Heng 張衡|张衡[Zhang1 Heng2] in 132
trad. 候風地動儀
Also written 候風地動儀【hòu fēng dì dòng yí】
the world's first seismograph invented by Zhang Heng 張衡|张衡[Zhang1 Heng2] in 132
trad. 候風地動儀
Also written 候風地動儀【hòu fēng dì dòng yí】