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Type 98 320 mm mortar : ウィキペディア英語版 | Type 98 320 mm mortar
The , known by the nickname "Ghost rockets", was an artillery weapon used by the Japanese military during World War II, especially during the Battle of Iwo Jima.〔CLOSING IN: Marines in the Seizure of Iwo Jima〕 ==Specifications== The mortar consists of a steel tube closed at one end by a steel baseplate, which rests on a wooden platform. The , , shells fit around and on top of the tube, instead of being dropped inside, making this a spigot mortar. The range of each shot was adjusted by adding different size powder charges at the base of the round. The barrels could only handle five or six shots apiece before becoming damaged and unusable. When used in large groups, as was often done, it produced a fearsome effect known as "the screaming Jesus" to U.S. Marines.〔 To absorb the massive recoil caused by firing their projectiles, the mortar tubes were almost always placed up against a mound of dirt.〔Journal of the United States Artillery (1919:148)〕
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