Some three years ago a group of scientists witnessed a demonstration involving the propagation of strong radio signals from a surface transmitter to a receiver located 700 feet below the surface in a salt mine at Grand Saline, Texas. Since that time two misconceptions have arisen concerning the demonstration, namely: (1) that the signals were not transmitted through the earth, but instead, reached the receiver by travelling through the mine shaft, and (2) that considerable power was required at the transmitter, which implied high earth attenuation of the signals. This paper presents evidence that denies these beliefs.

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