The following types of gaines are used in conjunction with igniferous fuzes to obtain de-tonation of the bursting charge in H.E. shell and piercing shell:–

When used in conjunction with a base fuze the gaine is fitted to the fuze either by means of screwed adapter (Fig. 8A) or by being screwed directly into the head of the fuze.

When the gaine is used with a nose fuze it may be screwed into the base of the fuze, or it may be fitted with a plain flanged adapter (Fig. 8B) and inserted in the mouth of the exploder container in the shell.

The filling of the gaine is contained in an aluminium capsule 1.28 inches long and 0.29 inch in diameter. The capsule is open at one end, with an external flange, and at the other end, has a concave base. The main filling consists of 13.7 grains (0.89 gram) of cyclonite, and above this is an initiator in the form of an inverted cup containing 6.6 grains of lead azide/lead styphnate (55 per cent/45 per cent). The cup has a hole in the base which is lightly closed by two discs of white silk. The capsule is closed at the mouth by a perforated cup which in some instances contains a 2.2 grain perforated pellet of gun-powder.

The gaine is used in H.E. shell under the Inneschi graze fuze with a ballistite exploder. The screw-threaded steel body is 0.97 inch in diameter and has approximately 11 threads to the inch.

The filling consists of 35.4 grains (2.3 gram) of ballistite, and is contained in the cup-shaped interior of the gaine, which has a flash-hole at the base ligthly closed by a gauze disc. The gaine is closed at the head by a steel screwed plug with central flash-hole. The hole is closed by a paper disc adhering to its underside. The ballistite contains ap-proximately 45 per cent of nitroglycerine and the nitrocellulose has a 12.3 per cent nitro-gen content.

The gaine is used in H.E. shell under the Inneschi graze fuze with a T.N.T. exploder. The diameter and number of threads to the inch are the same as with the ballistite gaine.

The aluminium body is screw-threaded over the whole of its length and is solid at the base. The filling consists of 27.8 grains (1.8 grams) of cyclonite under an inverted alumi-nium cup containing 10 grains of lead azide/lead styphnate (40.1 per cent/59.9 per cent). The base of the cup has a central flash-hole closed by a fabric disc. The gaine is closed by a similar cup, inserted base downwards, with a paper washer beneath it.