Simulation ground burst simulator

Projectile Simulators. Airburst and ground, burst simulators are used in connection with artillery training. They are actually pyrotechnic items as they contain pyrotechnic compns (Ref 40b, p 4). Various types of simulators are described in Ref 51c, pp 5-13 to 5-18... 

Whistles, Pyrotechnic. US projectile ground-burst and booby-trap flash simulators precede their flash and expin with a whistling sound. The fact that certain compns whistle when compressed into a tube and ignited has been used in the fireworks industry for many years. The active substance most often used in pyrot whistles is gallic acid (3,4,5-trihydroxybenzoic acid). The K salts of benzoic acid of 2,4-dinitrophenol and of picric acid (2,4,6-trinitrophenol) and the Na salt of salicylic acid (o-hydroxybenzoic acid) are also effective. They are combined with K chlorate,... 

This mixture, Photofiash Powder, Type I, Class A, was used at the start of W. W. II for M46 Photoflash Bombshutis now relegated to small items such as the MI 15 Projectile Ground-Burst Simulator r which the flash and sound follow a pyrotechnic whistle. 

By means of numerical simulation, in double face square, the hard-thick strata above the coal seam may be affected by the mining area and have mining earthquake induced by the hard-thick strata. It won t produce disastrous effects to the ground, but may lead to a sharp concentration of coal seam stress, which may induce burst. 

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