now "matched", and he switches the train drive into Auto. This disengages his hand wheels, and gives train angle control to the Fire Control System. Then, he reports back to the Mount Captain, "Train in auto." He may now look through his sight, and if the Sight Setter has matched the sight-setter dial pointers, he will see the target in the cross-hairs. When the Mount Captain commands, "Switch to Local", he switches the train drive to local. In local control, he controls the gun's train angle with his hand wheels to keep his sight's vertical cross hair on the target. Sight setter Operates the sight setting equipment. In single mounts, he stands just behind the trainer (see the man with headphones in the Mk21 open mount picture), while in twin mounts he sits between the guns, just forward of the projectile hoists. The sight setter moves the sights' reticles relative to the barrel's axis. In early open mounts, this was done by moving the platforms to which the sights were bolted. Sights in enclosed mounts have movable prisms in their optical paths. The sight setter has three dials, and two hand cranks. (pictured) The two right dials and right hand crank control the elevation reticle offset (called Sight Angle). The upper right dial is scaled in minutes of arc, and the lower right dial is in yards. The left dial and hand crank control the reticle's left and right offset (called Sight Deflection), and the dial is scaled in angular mils. When the mount is in Automatic Control, he turns his hand cranks to keep index marks on his dials matched to lines on the central disks of the dials. These disks are electrically controlled by the Fire Control System by synchro. This is called matching the pointers, and it allows the sights to remain on the target while the mount is controlled by the Fire Control System. In local control, he takes sighting orders from the Mount Captain in yards of range and mils of deflection. Fuze setter He operates the equipment which sets the fuze time on projectiles with mechanical time fuzes. On a single enclosed mount, he sits below and just outboard of the Pointer's seat. Under the Pointer's seat, and in front the Fuse Setter, is the Fuse Indicator Regulator. (pictured) It is a box with a window, a hand crank, and a selector lever. On