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Updated: June 17, 2025
Ochorowicz calls "radiographs," because they can only be explained by supposing that the fluidic hand, which is placed upon the photographic plate, is in some way radio-active during the process. In no other way can the facts be explained.
At first blush this seemed to contradict the great physical law of the conservation of energy, but physicists were soon agreed that a less revolutionary explanation of the phenomenon is perfectly tenable. The giving off of heat is indeed only an additional evidence of the dissipation of energy to which the radio-active atom is subjected.
Thorium, a very rare metal, is the second of the seventy-five or eighty elements known when radio-activity was discovered, which has been found to undergo spontaneous disintegration with the emission of rays. The rate of change of thorium is considerably slower than that of uranium. None of the other substances placed in the class of elements is radio-active.
As yet this question is an open one, although several of the leading investigators have postulated tentative hypotheses which at least serve as a working basis until they are either confirmed or supplanted. On one point, however, there seems to be unanimity of opinion there seems to be little question that there are at least three different kinds of rays produced by radio-active substances.
As, for example "A pound weight of radio-active energy, if it could be extracted in as short a time as we pleased, instead of in so many million years, could do the work of a hundred and fifty tons of dynamite." This agreeable fact stuck in his brain as a bone may stick in a throat, causing a sense of congestion.
In briefly considering these three phenomena, I shall choose radium compounds as representative of the class of radio-active substances. Radium compounds spontaneously give off energy in the form of heat. Radium compounds send forth three kinds of rays, distinguished as alpha, beta, and gamma rays.
The helium compound in its breaking up must give rise to the peculiar radiations and also pass through the successive radio-active change observed in radium.... On the other hand, radium, as far as it has been examined, has fulfilled every test required of an element.
Radio-active substances are constantly giving off energy in the form of heat, sending forth rays which have definite and remarkable properties, and producing gaseous emanations which are very unstable, and change, some very rapidly, some less rapidly, into other substances, and emit rays which are generally the same as the rays emitted by the parent substance.
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