Type 2 12 cm mortar
The Type 2 12 cm mortar is a smooth bore, muzzle-loading type mortar which, except for the firing mechanism, closely resembles the conventional Stokes-Brandt mortar. The Type 2 mortar was the final standardized armament for Japanese trench mortar battalions, effectively replacing less powerful trench mortars and heavier trench mortars.
Only one type of ammunition was produced, the Type 2 HE round, which had more than twice the explosive fill of Japanese rounds. The Type 2 mortar was considered an effective and modern design by the Imperial Japanese Army; however, it only saw wide-scale dissemination during the last of the year.
Japanese,, and mortars were labeled as "trench mortars" and were effectively controlled by Imperial Japanese Army artillery units instead of infantry units. Initially Japanese trench mortars where primarily developed as chemical-delivery weapons, but would mainly see service in conventional roles during the Greater East Asia War.
Design
The mortar examined was manufactured at Osaka Arsenal in 1943. This mortar is described by the Japanese as having an overall length of, and a bore length of. The total weight of the weapon is reported to be, of which represent the weight of the tube, the bipod, and the base plate. The weapon allegedly can be fired by dropping the shell down the tube to strike a fixed firing pin, or it can be trigger fired. Elevation of the piece, accomplished by adjustment of the bipod legs, ranges from 800 to 1,422 mils; traverse, at a 45-degree elevation, is 180 mils and at 70 degrees 210 mils. Maximum range of the piece is reported to be.The base plate is very heavy and is fitted with four carrying handles. The sight bracket fits the standard mortar sight. The barrel is heavily reinforced at the muzzle and has two raised ribs midway of the barrel, between which the barrel clamping collar is held. The firing mechanism is similar to that used on the Type 99, 81 mm short mortar. After the weapon has been loaded, a plunger, which projects upward from the mortar breech, is struck with a mallet or similar instrument, thus camming out the firing pin and firing the mortar. A safety lock is fitted on this firing plunger.