(Figs. 16 and 17)

This fixed Q.F. round is used with the 7.62 cm anti-tank gun (Pak 36 (r)) and, with its 28.2 inch cartridge case, has an overall length of 38.8 inches. The weight of the com-plete round is 22 lb. The shell, fitted with the fuze kl.A.Z. 23, is painted the normal deep olive green but has a 1.2 inch green or white trip. The designation of the equipment does not appear on the case which has stamped in the base the model number "6340 St" and "Pak 44 Rh". The marking "Sprgr", indicating an H.E. Shell, and the weight class in Roman figures are stencilled in white on the base of the case. The numeral "13", indiacting a bursting charge of 40/60 Amatol is stencilled near the top of the shell.

The streamlined shell is forged steel. The cavity is wholly unmachined except for an in-ternal screw thread at the nose accommodate the exploder container and fuze. The driv-ing band is of the bi-metallic type. The weight of the empty shell is 11.8 lb.

The bursting charge consists of cast 40/60 Amatol and weighs 1.19 lb. The exploder sys-tem, as shown in the drawing, is similar in all respects to that to the 7.5 cm Pak 40 H.E. shell filled Amatol described in Pamphlet No. 7. The filled and fuzed shell weighs 13 lb. 15 oz.

The kl.A.Z. 23 with optional delay of 0.15 second is a smaller model of the A.Z. 23 type.

The cartridge case is of brass-plated steel and bears the model number 6340 St and the abbreviation Pak 44 Rh stamped in the base. It is 28.2 inches in length and is affixed to normal cannelure below the driving band of the shell. The primer C 12 n.A. St. is similar to that described in Pamphelt No. 4, page 10, but is of steel in lieu of brass.

The make up of the propellant charge is shown at Fig. 16 and will be seen to comprise four portions:–

1. The igniter pocket formed by sewing across the main bag which is of artifical silk. This contains about 1 oz. 13 drs. of nitrocellulose powder in the form of cylindrical grains. The composition includes diethylene glycoldinitrate (approximately 8 per cent), centralite, di-phenylamine, potassium sulphate and incorporated gra-phite.

2. The main propellant pocket, marked to indicate the weight, nature and size of the propellant, as shown in the illustration. This contains about 1 lb. 9 oz. of square flake propellant (Gu.Bl P.A.O. 4 x 4 x 0.6), of the following composition:–

Nitrocellulose (Nitrogen 12.17 per cent)

Diethylene glycoldinitrate

Nitroguandine

Graphite

3. A central cross-webbed tube of propellant, of the form shown in the inset, which ap-parently acts as a distance piece for the charge. This has the following composition:–

Nitrocellulose (Nitrogen 12.91 per cent)

Diethylene glycoldinitrate

Potassium sulphate

Graphite

The tube is 21.7 inches long and has a diameter of approximately 0.55 inch. The mean thickness of the cross-shaped web is 0.04 inch.

4. An annular bag marked "20 kg K₂SO₄" which contains approximately 10 drams of po-tassium sulphate.

Fig. 16

Fig. 17