An attack has been made upon the problem of the form of the seismic disturbance which proceeds outward from the explosion of a charge of dynamite and the laws of propagation of this disturbance. A mathematical theory was developed about ten years ago and a small amount of experimental work carried out at that time encouraged further efforts. Recently an extensive series of experimental researches have been carried out in a sensibly homogeneous shale section, and as a result of these studies a rather clear understanding of the form and nature of the primary seismic disturbance, and its laws of propagation, has been obtained for shale. The results are in good agreement with the theory.

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