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ammonium nitrate apex bullet cannon carbon dioxide Cardox cartridge charges of Celmonite Charges of Permitted clay plug Coal Dusts Coal Mines combustion conical wave system core angle cored prominences decomposition detonator direct diagram diameter differences discharge disturbance effect expanding explosive material five-E charge five-n and five-E flame-stop gaseous products gases Grimshaw and Payman head-wave heavier charge Ignition of Firedamp illuminating spark individual particles inert initiated directly inversely initiated charge large prominence later positions main shock wave main wave Mason and R. V. metres per second Mines Research Board non-igniting charge open prominences permitted explosives photographs Plate position 2a pressure wave prominence in Fig prominence in position R. V. Wheeler record of position records obtained S.M.R.B. Paper Safety in Mines Schlieren photography Schlieren record semi-cone angle shot shown solid particles speed stemmed charges surface T. N. Mason tion unstemmed velocity of sound volatilisation wave front wave has travelled WAVE SENT