Before revision: Korea Korea, Jang Yeong-sil, a Korean engineer of the Joseon Dynasty, under the active direction of the king, Sejong the Great, invented the world's first rain-gauge , uryanggye () in 1441.
After revision: Korea Korea, Jang Yeong-sil, a Korean engineer of the Joseon Dynasty, under the active direction of the king, Sejong the Great, invented the world's first rain gauge , uryanggye () in 1441.