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The Smoke Float No. 1 Mk IV comprises a cylindrical body, closed at one end by a conical head and a heavy nose. A retarding band is secured to the body adjacent to the head. A tail cone, carrying three vanes to support the vane ring, is secured to the opposite end of the body. The end of the tail cone houses a pistol adapter for the tail pistol, which is locked in place by a grub screw. Inserted in the pistol adapter is a cup, containing a cartridge base and a small quantity of flash composition, sealed with a paper disc. A sleeve leads from the bottom of the pistol adapter into the funnel-shaped, upper end of the tube, known as the container cap tube. The container for the smoke composition has a fusible cup inserted into the top of the smoke composition, which is filled with pressed priming composition, Above this is a layer of loose priming composition, and a primed cambric disc through which is threaded a length of quick match. The container is closed by a container cap. A central cylinder, provided with a ring of holes, surrounds the container. The rest of the body and the tail cone comprise a buoyancy chamber. The tail cone is provided with a sinking disc, which is scored, so that if a floating smoke float is found, the disc can be easily pierced to sink the float, the water entering the tail cone and passing into the body through the holes in the central cylinder.
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