The successful use of radar for locating objects has led the authors to consider the possibility of using it to determine discontinuities within the earth. Knowledge of the propagation characteristics of waves in the earth is required before such a development might be undertaken. The present article reviews the literature in this field and reports experiments in which the velocity, attenuation, and wave length of electromagnetic waves in certain earthy materials were measured. The conclusion describes the possibilities of such a development based on the experimental results.

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