Ch'ŭgugi

Ch'ŭgugi (Korean: 측우기; Hanja: 測雨器; RR: cheugugi) were rain gauges invented and used during the Joseon dynasty of Korea. They were invented and supplied to each provincial office during the reign of King Sejong the Great. As of 2010, only one ch'ŭgugi remains, known as the Geumyeong Cheugugi (금영측우기; 錦營測雨器), which literally means "ch'ŭgugi installed on the provincial office's yard." It is designated as National Treasure #561 of Korea and was installed in the provincial office of Gongju city, 1837 by King Yeongjo. In addition, the official measure of rainfall by ch'ŭgugi from King Jeongjo's reign to Emperor Gojong's reign is preserved.

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