Since this turret is of the ball type, the gunner moves with his guns and sight in elevation and azimuth by means of control handles. Among the earlier designs was the Martin 250SH bow turret of the PBM-3 twin-engined patrol flying boat which had many points of similarity in design and action.
Because this turret is ball-type, the gunner maneuvers his guns and sight up and down and side to side via control handles. Among the earlier designs was the Martin 250SH bow turret of the PBM-3 twin-engined patrol flying boat that had many similarities in design and function.