The results of a seismic well survey made with calibrated recording equipment are presented. This survey differed from the conventional type in that a geophone which could be locked to the wall of the bore hole was used, thereby providing reliable amplitude data and permitting reflections to be recorded at depth. Consequently it was possible to observe the true shape and amplitude of the seismic pulses, both initial and reflected, over the major portion of their travel paths. Quantitative data were obtained on such factors as decrease of pulse amplitude with depth, location of reflecting horizons, and magnitude of reflection coefficients.

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