Search the dictionary A Chinese word or character, or English Draw a character Search 2 entries. hòufēngdìdòngyí 候风地动仪 the world's first seismograph invented by Zhang Heng 張衡|张衡[Zhang1 Heng2] in 132 hòufēngdìdòngyí 候風地動儀 the world's first seismograph invented by Zhang Heng 張衡|张衡[Zhang1 Heng2] in 132