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The Type 98 50 mm mortar is a smooth-bore, muzzle-loading weapon. The Type 98 designation was given to this gun as it was accepted in the year 2598 of the Japanese calendar (1938)〔War Department Special Series No 30 ''Japanese Mortars and Grenade Dischargers'' 1945〕 ==Design== The Type 98 50 mm mortar may be identified by the rectangular, sectionalized base plate, the fixed position of the bipod, the V slots painted white and located at 12 o'clock on both the barrel collar and the projection of the muzzle hoop and the marking which is on the outside of the container in which the weapon is packed. (This marking, which is read "Kyuhachi Shiki Totekiki" from right to left, means "98 Type discharger.")〔 The propelling charge consists of black-powder increments packed in small silk bags. Each increment is approximately 3.75 inches long and 1.25 inches in diameter. A pull-type friction primer, 0.88 inch in length, equipped with a loop lanyard, is designed to fit into the primer seat, or touch hole.〔 The mortar consists of three main parts the base plate, the bipod, and the barrel. It has a fixed elevation of about 40 degrees. Provision is made for a limited traverse. At the base of the tube is an offset primer seat. Two links, one on each side, extend from the barrel collar. A range slide, graduated from 0 to 60, may be clamped to the muzzle of the mortar.〔 The Type 98 50 mm mortar fires a formidable stick bomb weighing nearly 10 pounds and containing an explosive charge of approximately 7 pounds of picric acid in rectangular blocks. The body of the bomb, made of sheet metal (three-sixteenths of an inch thick), is rectangular in shape 4 1/2 by 4 1/2 by 6 1/2 inches) and is painted black. A hardwood stick 21 inches long and 1.91 inches in diameter fits into a socket in the base of the body, and is held in place by nails or screws. The bottom end of the stick is covered with a metal cap. Two friction-type pull igniters, with black-powder delay trains giving a delay interval of approximately 7 seconds, fit into holes in the base of the charge.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Type 98 50 mm Mortar」の詳細全文を読む スポンサード リンク
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