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| HANDBOOK OF ENEMY AMMUNITION |
| PAMPHLET No. 5 |
| GERMAN SMALL ARMS AMMUNITION, GREANDES AND DEMOLITION CHARGES |
| GERMAN CARTRIDGES, S.A.A., 7.92-mm |
| 17. B. EXPLOSIVE INCENDIARY (Fig. 8) |
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The chronium-tipped bullet contains a charging of white phosphorus in the ogival head and a striker with detonator below the ogive. The phosphorus charging in the head is sealed by a lead plug which is recessed from the base to receive the holder containing the striker and detonator. The holder consists of a steel tube coated with gliding metal. The tube is closed at one end and has an internal step to support the detonator. The forward end of the holder is closed over the detonator by a lead plug. The detonator consists of an aluminium shell with a hole in the base. The hole is closed by aluminium disc and the shell filled with a mixture of lead styphnate, barium nitrate, antimony sul-phide, calcium silicide and tetrazene. The front end of the detonator is closed by a tight-ly fitting lid of aluminium. The steel striker is positioned behind the detonator and is kept in a safe position by a tightly fitting steel split collar which protrudes forward beyond the striker point. The base of the bullet is closed by a lead plug under the base of which the envelope is turned. |
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On impact the striker pierces the detonator which breaks up the envelope and projects the phosphorus. The phosphorus ignites spontaneously in the air. |
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The black bullet with plain tip is meachnically the same but differs in the incendiary charging. The charging in this type is a transparent product with the consistency and appearance of paraffin. This is ignited by friction and not solely by contact with air. |
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| 18. l.S.L'Spur TRACER, PRACTICE (Fig. 9) |
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The envelope contains an aluminium core and a tracer tube. The tube is of steel, coated with gliding metal on both sides and contains a tracing composition which produces a yellow trace up to approximately 900 yards. The tracer composition is protected by a disc of pink plastic, the whole being kept in place by an aluminium washer over which the base of the envelope is turned. |
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| 19. PERFORATION OF ARMOUR BY A.P. TYPES |
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It has been established by trials that the A.P. types will defeat homogeneous hard armour plate of the following thickness at normal impact at 100 yards:– |
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A.P. |
12.43 mm |
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H.V.A.P. |
14.15 mm |
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H.V.A.P. with tungsten-carbide core |
19.0 mm |
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A.P./T. |
8.8 mm |
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H.V.A.P./T. |
10.5 mm |
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A.P./I. |
7.52 mm |
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H.V.A.P./I. |
8.8 mm |
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The S.A.P. bullet may be except to defeat a similar plate 7 to 10 mm at 100 yards, nor-mal impact. |
| 20. ARMOUR PIERCING CORES |
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The composition and hardness of the hardened steel armour-piercing cores are varied. The diamond pyramid hardness figure is approximately 900 and typical compositions are as follows:– |
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Carbon |
1.37 |
per cent |
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Silicon |
0.1 |
to |
0.3 per cent |
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Manganese |
0.2 |
to |
0.4 per cent |
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Chromium |
0.2 |
to |
0.5 per cent |
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Tungsten |
1.0 |
to |
1.2 per cent |
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Vanadium |
0 |
to |
0.2 per cent |
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The tungsten-carbide core has an average hardness figure of 1850. The composition of the material has been found by analysis to be as follows:– |
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Carbon |
5.4 per cent |
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Silicon |
under |
0.07 per cent |
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Chromium |
0.1 per cent |
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Tungsten |
90.4 per cent |
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Nickel |
1.8 per cent |
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Iron |
1.0 per cent |
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Titanium |
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Trace |
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