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Today, I went to Seoul Museum of History. Especially, I want to explain about Jagyeokru. Jagyeokru was made by Young-sil Jang. It is automatic water clock. Even though there was a water clock, but Jang's was better. Because the past one must need the worker called '경점지기'. So, If 경점지기 sleep and doesn't notice the time, cities of nation can be confused since they can't recognize the time.
Except that, Jang made very various inventions. For instance, Rain Guage, Solar Clock 'Angbuilgu', etc. were all made by Jang.
Anyway, the oppertunity that I went there, is the best chance to know better about Jang's inventions and himself.
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