United States Gas Hand Grenade, M-n (Fig. 10).—'This grenade, which is typical of all the World War gas grenades, consisted of a sheet-steel body, steel bushing, detonator thimble, detonator, and automatic firing mechanism (bouchon), as shown in Fig. 10.
In throwing the grenade, it was first held firmly in the right hand with the firing mechanism up, in such a manner as to secure the lever. The safety pin was then pulled with the index finger of the left hand. The grenade was then armed. After it was thrown, the lever, which was no longer held by the safety pin, was thrown off and the striker pin, impelled by a strong spring, rotated around its hinge, pin and struck the primer, first perforating the tinfoil disk which was sealed over the top of the cap to waterproof the primer. The end of the fuse was tipped by a priming
Phmet—$triker spring Moisture cap—% ^ £ Hinge pin
Bick forci fuse
Safety sp/it _
- Bouchon sealer — Bushing
"Lever — Detonator
hsnd grenado, M-1Z.
powder composition which ignited the primer and in turn the fuse. In h seconds the flame from the fuse exploded the detonator, which burst the grenade with sufficient force to scatter the chemical filling in fine droplets. The gas cloud produced was intensely irritating to the eyes and respiratory passages and caused lacriinatiou and violent coughing.
Postwar Development.—Since the late war «ever«! type« of gtws grenades have been developed in this country. The early postwar tyi>es utilized the grenade bodies manufactured during the war and were filled with CN, the American standard lacrimatory filling. Thcnc grenade* were found to be unsatisfactory because, of the small amount of chemical filling that could be loaded into the grenade body. To overcome this defect, the grenade body was redesigned to increase its capacity without making it too large or heavy to be thrown by hand. As a result of postwar development, two types of gas grenades have been developed and adopted as standard for the United States Army. These are known as: ^
United States Standard Tear-gas Grenade.—The standard tear-gai grenade (CN), M-7, consists of the container, igniting fuse, and filling (see Fig. 11). The container is a tin cylinder 2% in. in diameter and 4^ in. high. Two thin disks are crimped and soldered to the wall forming the top and bottom of the container. The top has a %-in. hole punched in its center into which is inserted and soldered an adapter. The latter is internally threaded to take the igniting fuse. Small holes are punched
in the top of the body around the adapter and, in the fast-burning type, in the wall of the container body. These are normally covered by small squares of adhesive tape.
The fuse consists of a fuse body which carries the firing mechanism and a 2-second fuse. The firing mechanism consists of a steel striker horizontally hinged on a steel hinge pin in a recess between the two wings of the fuse body and actuated by a steel-coil spring. A firing pin is attached to the striker. The striker is normally held away from the primer, against the tension of the spring, by a lever which forms a cover for the firing mechanism and extends downward over the top of the container. The lever hooks under a protruding lip of the fuse body and has two wings through which a split pin of annealed steel passes securing it to the body. This pin forms the safety device for the firing mechanism. The fuse assembly consists of a primer of fulminate of mercury and a
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