FIRING AND SAFETY FEATURES

9. The depth charges are exploded at a predetermined depth by the hydrostatically ope-rated pistol. The depth range depends upon the pistol used.

10. The chief safety feature for keeping charges from exploding until after they have en-tered the water, is the separation existing between the booster and detonator. Another safety feature is provided in the form of a pistol safe setting.

HOW THEY WORK

11. During shipment and stowage of a depth charge pistol, the inlet valve is closed by a plain safety cover screwed onto the valve body. When a charge is placed in a depth charge track this cover is replaced with one fitted with a projecting knob. The knob is broken off the cover by a wiping plate on the track when the charge is dropped, leaving an opening through which water can enter the pistol. If a charge is thrown from a pro-jector, the plain cover is used. Before the projector is fired the plain cover must be re-moved by hand.