picture.) The Cross Head supports the Rammer Spade as it moves in the tray. When the cylinder is pressurized, the Cross Head and Spade are driven forward in the Tray. As the spade moves forward, it pushes the projectile and powder case into the chamber. The spade's time of travel, from the rear of the tray to the breech, is one second. As it approaches the breech, the Cross Head pushes through a spring latch that locks it there. At the same time, the Cross Head trips another lever connected to the Rammer Controller, and the Controller releases the hydraulic pressure to the Ram Cylinder. When the powder case clears the top of the breech block, the block automatically rises. The rising breech block displaces the rammer spade behind the powder case by pushing the spring-loaded spade up. This continues until the rammer spade is off the powder case, and the block has sealed the chamber. The gun is loaded and ready to fire. Firing This gun can be fired either electrically or by percussion. When the gun fires, the following automatic events happen in two seconds: During Recoil: The Rammer Crosshead is unlocked. The Rammer Control is pushed to the up position by a cam on top of the rearward moving Housing. With the Rammer Control up, the Rammer Controller ports high pressure hydraulic fluid to the retract side of the Rammer Cylinder, and the Rammer Crosshead and Spade drive back to the rear of the Rammer Tray. During Counter-recoil: The Firing Pin is cocked. The Breech Block is lowered. The spent Powder Case is ejected out of the Chamber, and back down the Rammer Tray. There it is caught by the gloved Hot Case Man, and thrown out of the mount. Just before the housing finishes returning to "In Battery", a valve is opened for a second, and a blast of compressed air is sent down the bore to clean it out. The gun is ready to be reloaded. Gun mounts Types There are four basic mount types: Twin All sat on a base ring stand, and had an ammunition handling room, called the Upper Handling Room (as it was above the main magazine), below the mount. They all had: Horizontal periscopic sights with movable-prism sight setting. Two powered, fuze setting, projectile hoists. Two powered powder case hoists. Powered training and elevating drives (in this context, "training" means