The relative efficiencies of various sizes of explosive charges for the generation of seismic energy were investigated and a procedure devised whereby a number of charges of the most efficient size would be detonated progressively in such a manner that the energy from all the individual charges would arrive simultaneously at the recording position. The results of investigations of this system of progressive detonations, using both horizontal and vertical spacings of the individual charges, are presented and its possible application in reflection and refraction seismic surveys is discussed.

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