. Radioactivity of the thermal waters of Yellowstone National Park . OP YELLOWSTONE NATIONAL PARK. 11 minutes, was then introduced into the electroscope, which had previ-ously been partly exhausted, to be standardized. After three hours,the time in which the activity attains a maximum, the rate of leakwas determined. The standardizing record of one of the electroscopes, which isdesignated in our journal as No. 1, is given below in Table 1. Thequantity of uraninite used in each experiment was numbered 3 and 4 were conducted in YellowstonePark in the field laborato
. Radioactivity of the thermal waters of Yellowstone National Park . OP YELLOWSTONE NATIONAL PARK. 11 minutes, was then introduced into the electroscope, which had previ-ously been partly exhausted, to be standardized. After three hours,the time in which the activity attains a maximum, the rate of leakwas determined. The standardizing record of one of the electroscopes, which isdesignated in our journal as No. 1, is given below in Table 1. Thequantity of uraninite used in each experiment was numbered 3 and 4 were conducted in YellowstonePark in the field laboratorv, and the others were made in the chemicallaboratory of the University of Missouri. The samples of uraniniteused for standardizing in the park were carefully weighed out andsealed in small glass tubes before we started for the field work. Thefirst column in the table gives the number of the experiment; thesecond, the date on which it was conducted; the third, the number ofscale divisions the leaf fell per minute at the time of maximumactivity—three to three an
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