As a kind of a gourd-shaped mortar, a Wangu is also called a Daenggu. It is said that Choe Haesan (1380~1443) invented it during the reign of King Taejong of Joseon. Wangu can be divided into three parts: Wan or the muzzle of the mortar, Gyeongmoktong or the barrel of the mortar, and Yaktong or the powder chamber. Wan is the place where shots such as a large stone (diameter 20 cm) or a metal ball, is placed, and it has the shape of a dish. Yaktong is the place where gun power is put in, and it has 2 ignition holes into which an igniter is put inside. In the middle between Yaktong and Wan is a Gyeongmoktong, and here there is a Gyeongmok made of wood for conveying the explosive force that takes place when gunpowder explodes to the Wan. This Wangu, with a total length of 64.4 cm and a gun muzzle diameter of 26.3 cm, was made of bronze by gun craftsmen Yoo Huijun and Kim Hyeongup in the 11th year (1845) of King Heonjong of Joseon Dynasty. The shape is very nice and grave looking, and the outside has been divided into 5 joints in the shape of a bamboo tree. The handle part of the powder chamber has two small holes made. The left one has been installed in preparation for emergencies during the shooting process. The end part of the gun is round-shaped with a diameter of 28.8 cm, and here inscriptions engraved with detailed records such as an illustrated training guide, the instructor, etc. For a large Wangu, this is the only remnant, the manufacturing technique is superb, and the preservation and storage has been done well, making it a national defense science culture asset with out any inferiority.
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