候風地動儀

Simplified: 候风地动仪

hòufēngdìdòngyí ㄏㄡˋ ㄈㄥ ㄉㄧˋ ㄉㄨㄥˋ ㄧˊ

    • the world's first seismograph invented by Zhang Heng 张衡 zhānghéng in 132

Character by character

Sources