1) Korean invention 
Cheugugi(Hangul:측우기, Hanja:測雨器) is well known first rain gauge which is invented and utilized by the Joseon Dynasty of Korea. It was invented and supplied to each Provincial offices during the King Sejong the Great`s reign. As of 2010, only one example of the Cheugugi remains, known as the Geumyeong Cheugugi (Hangul:금영측우기, H....