Abstract
The primary object of the investigations described in the paper was the determination of the energy required to produce a gaseous ion when X rays pass through a gas, and to deduce from the result the amount of energy radiated out into the gas by uranium, thorium, and the other radio-active substances. In order to determine this “ionic energy” it has been necessary to accurately measure the heating effect of X rays and the absorption Röntgen radiation in passing through a gas.

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