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Siege Cannon (Ordnance BL 9.2inch Howitzer)
Mk I
130kg Shell / 18kg Trotyl HE
Carriage traversing 30 degrees left and right, typically mounted on a platform holdfast sunk to the ground. Barrel supported upon a tubular cradle pivoted by trunnions, with a hydro-pneumatic floating piston recoil system. High elevation requires shorter recoil to prevent the breech from rebounding into the platform; full recoil is permitted at lower / near horizontal elevation.