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Abstract
The application of high-speed photographic techniques to the study of certain aspects of the displacement and breakage of rock by high explosives is described. Short-duration, argon-filled, explosive flash units yield a single photograph at a predetermined interval after the explosion. Cine-photographs at 1000 p.p.s. with a camera of the rotating prism type give a continuous record of the blast. Supplementary illumination of rock faces is generally necessary. Serial ignition of flash bulbs is convenient and is capable of being used as the sole illuminant on sites where daylight is absent.