Curves are presented which show the amplitudes of some reflection records, plotted as a function of time, for several widely separated areas. It is shown that amplitude ratios of the order of 1000:1 occur on records in a time interval of two seconds. After correcting for divergence of the recorded waves, it is found that their amplitude decreases exponentially with time. The usable length of record as a function of the size of charge was investigated for one shot hole.

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