6-in. Gun Mountings.
The 6-in. guns are mounted on the well-known central pivot principle. This principle was first introduced by Sir W. G. Armstrong, Whitworth and Co., and has since been adopted for mounting guns of medium calibre by all the Governments and armament constructors in the world. Briefly, to describe this system, it may be said that the gun is mounted in a cradle in which it recoils, the recoil being absorbed by an oil buffer attached to it forming a part of the cradle, the piston of which is attached to the gun. The cradle is mounted by means of trunnions on a Y piece, which revolves on hard steel balls placed on a fixed pedestal. This pedestal is bolted to the ship’s structure, the elevating arrangements are attached to the cradle, thus enabling the elevating gun number to work the gear even during the firing of the gun without injury to himself. Telescopic sights are fitted in a convenient position. Electric circuits are fitted to enable the guns to be fired by the simple operation of pressing the trigger of a pistol. Arrangements for percussion firing are also provided. A circular shield is attached to the revolving Y piece, so as to keep the port opening in the ship’s side blocked up at any angle of training. This port opening allows for the guns to be trained through a range of 120 deg., viz. 60 deg. before the beam and 60 deg. abaft.