Knee mortar

Type 89 was a simple grenade thrower used by the Imperial Japanese Army infantry. It has a short rifled barrel with an adjustable threaded rod inside. Always fired at an angle of 45 degrees, the range of the projectile was adjusted by moving the rod inside the barrel, thus altering the space inside for combustion. The bottom has a small curved plate to dig into the ground. The Japanese called it a "Leg Mortar" as it was carried strapped to the leg, but a mis-translation in Allied reports led to the term "knee mortar" and the belief that it was fired holding the curved plate against the thigh.

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