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Updated: April 30, 2025
IX, Part I , Regne de Louis XVI, 1774-1789, by H. Carre, P. Sagnac, and E. Lavisse, especially livres III, IV; Emile Levasseur, Histoire des classes ouvrieres et de l'industrie en France avant 1789, Vol. II , livre VII; Maxime Kovalevsky, La France economique et sociale a la veille de la Revolution, 2 vols.
M. Sagnac has commenced some experiments, as yet unpublished, in order to study the laws of the fall of a fragment of radium. They are necessarily very delicate, and the energetic and ingenious physicist has not yet succeeded in finishing them.
It is not impossible, even, to admit that the energy which the atom of radium withdraws from the surrounding medium may serve to keep up, not only the heat emitted and its complex radiation, but also the dissociation, supposed to be endothermic, of this atom. Such seems to be the idea of M. Debierne and also of M. Sagnac.
I , Livre I, La Revolution, valuable for the history of the working classes; Philippe Sagnac, La legislation civile de la revolution francaise,1789-1804 , very important survey of permanent social and civil gains; E. F. Henderson, Symbol and Satire in the French Revolution , interesting side- lights.
These differ from the cathode radiations by being neither electrified nor deviated by a magnet. In their turn these X rays may give birth to the secondary rays of M. Sagnac; and often we find ourselves in presence of effects from these last-named radiations and not from the true cathode rays.
M. Sagnac, particularly, has shown that there can be obtained a gradually decreasing scale of more or less absorbable rays, so that the greater part of their photographic action is stopped by a simple sheet of black paper. These rays figure among the secondary rays discovered, as is known, by this ingenious physicist.
To these radiations there sometimes are added in the course of experiments secondary radiations analogous to those of M. Sagnac, and produced when the alpha, beta, or gamma rays meet various substances. This complication has often led to some errors of observation.
The rays which come from the tube, in conditions now well known, are not deviated by a magnet, and, as M. Curie and M. Sagnac have conclusively shown, they carry no electric charge.
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