A description of the method employed in determining the relative sensitivity of a reflection seismograph to harmonic displacement of 10 (super -3) inches is given. Results of comparing the sensitivity obtained at this level to the sensitivity used in reflection recording show a ground motion of 10 (super -8) inches for the deeper reflections. Comparisons are made between the sensitivities of the reflection seismograph and a mechanical seismograph taken at a level of 10 (super -5) inches.

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