Read the bio below and try to give details on jang yeong-sil 's: - img - hangul - mr - rr - hanja Bio: jang yeong-sil was a korean scientist and astronomer during the joseon dynasty -lrb- 1392 -- 1897 -rrb- . although jang was born as a peasant , king sejong 's -lrb- r. 1418 -- 1450 -rrb- new policy of breaking class barriers placed on the national civil service allowed jang to work at the royal palace . jang 's inventions , such as the cheugugi -lrb- the rain gauge -rrb- and the water gauge , highlight the technological advancements of the joseon dynasty .
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- img is jang youngsil 3.jpg- hangul is - mr is chang yongsil- rr is jang yeong-sil- hanja is