To most observers, the detonation of an explosive charge consists of a flash of flame, a loud report, a cloud of dust and smoke and some flying debris; a chaotic event without sense or control. Those who study these events, however, soon recognize that these explosions are orderly and predictable; they follow all physical laws and are extraordinary mainly in the rapidity with which they develop. Since our unassisted senses are far too sluggish to follow these occurances, we must depend for our observations on instruments capable of dividing time into very small increments. Of all such instruments, the most powerful by far are the photo-optical instruments utilizing the techniques of ultra-high speed photography and radiography.
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