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38 mm. in diameter and 6.4 mm. thick is placed upon it; a strip of manila paper wide enough to extend beyond the top of the composite cylinder and to form a container at its upper end is wrapped and secured around it; 100 grams of explosive is placed

Trauzl Test

Fiourz 14. Small Trauzl Tests of Detonators. (Courtesy Western Cartridge

Company.)

in this container and fired, without tamping, by means of an electric detonator. The result is reported as the compression of the lead block, that is, as the difference between its height before and its height after the explosion. The steel disc receives the force of the explosion and transmits it to the lead cylinder. With-

Figure 15. Aluminum Plate and Lead Plate Tests of Detonators. (Courtesy

Atlas Powder Company.)

out it, the lead cylinder would be so much deformed that its height could not be measured.

In the lead plate test of detonators, the detonator is fired while standing upright on a plate of pure lead. Plates 2 to 6 mm. thick are used, most commonly 3 mm. A good detonator makes a clean-cut hole through the lead. The metal of the detonator case is blown into small fragments which make fine and characteristic markings on the lead plate radiating away from the place where

Figure 16. Effect of Detonator on Lead Plate 10 cm. Distant from Its End. The diameter of the hole is about 1% times the diameter of the detonator which was fired. The lead has splashed up around the hole in much the same fashion as placid water splashes when a pebble is dropped into it. Note the numerous small splashes on the lead plate where it was struck by fragments of the detonator casing.

Figure 16. Effect of Detonator on Lead Plate 10 cm. Distant from Its End. The diameter of the hole is about 1% times the diameter of the detonator which was fired. The lead has splashed up around the hole in much the same fashion as placid water splashes when a pebble is dropped into it. Note the numerous small splashes on the lead plate where it was struck by fragments of the detonator casing.

the detonator stood. With a good detonator, the surface of the lead plate ought to show no places where it has been torn roughly by large fragments of the case. Similar tests are often carried out with plates of aluminum.

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