In 1442, some 200 years before data on rainfall was being kept in Europe, rain gauges of a design similar to this one were distributed to every province in Korea. The rain gauges were all of a uniform size adopted a standard unit of measurement. This enabled the emperor to keep accurate records whose data could then be used to improve agricultural technology in Korea.
These early rain gauges were designed by Jang Yeong-sil whose patron was King Sejong the Great who reigned the Choson Dynasty f...
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