The cartridge is used with the 7.62 cm Pak. 36 (r) (field gun of Russian origin) and inclu-des a case and primer also of Russian origin. The projectile is German.

The overall length of the round is approximately 26 inches, the capped projectile being painted black. The weight of the complete round is 21 1/4 lb.

The shell with its penetrative and ballistic cap is approximately 11.8 inches in length and is of the same general construction as the 7.5 cm shell described in Pamphlet No. 4, which includes a drawing (Fig. 15). The ballistic cap is attached to the penetrative cap by a circumferential weld. The forward end of the cavity for the bursting charge is occu-pied by a pad of inert composition.

The bursting charge is held in an aluminium container, shaped to at closely in the shell cavity, and consists of a 53 grain block of T.N.T. followed by a 162 grain cylindrical block, also of T.N.T.

The cylindrical block contains a 593 grain exploder pellet of P.E.T.N./Wax which includes a pink dye and has a cavity in its base shaped to receive the head of the fuze. The weight of the explosive filling is approximately 3 lb. The aluminium container is turned in at the base on to a cardboard and an aluminium washer.

The base fuze with tracer is the same as that used in the 7.5 cm shell. The tracer filling is held in a mild steel container inside the tracer body, which screws into the base of the fuze and is closed by a cellophane disc held between two screwed steel collars. The fil-ling weighs 238 grains and burns statically with a vivid light for about 10 seconds.

The case is of brass, 15.1 inches in length, and is not necked. The primer hole, which is 0.99 inch in diameter, is screwthreaded with 1 threads to the inch, and the flash hole at its inner end is closed by a cloth disc secured with shellac.

The granular propellant charge consists of 2 lb. 4 oz. of yellow-brown tubes of nitrocel-lulose powder containing a small proportion of potassium chloride. The stabilizer is di-phenylamine. The powder is filled directly into the case with a mill-board cup above it. The cup is secured by an arrangement of two cardboard collars with a millboard disc bet-ween them. There is no igniter.

The percussion primer 42 M, as shown in the drawing, has a hollow sealing cone of cop-per and is screwthreaded for insertion in the case. The cap filling consists of mercury ful-minante 21.9 per cent, potassium chlorate 40.3 per cent and antimony sulphide 37.8 per cent. The whole of the primer, except the base, is coated with a black varnish.