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Updated: June 13, 2025
"Truth on this side of the Pyrenees, error on the other side," M. Levy asserts; and Becquerel adds that it is not a science. So then they ordered for their dinner oysters, a duck, pork and cabbage, cream, a Pont l'Evêque cheese, and a bottle of Burgundy. It was an enfranchisement, almost a revenge; and they laughed at Cornaro! It was only an imbecile that could be tyrannised over as he had been!
Bernard could not help saying to himself, but, to be sure, he had just been looking at the young girl next him, so that his eyes were brimful of beauty, and may have spilled some of it on the first comer: for you know M. Becquerel has been showing us lately how everything is phosphorescent; that it soaks itself with light in an instant's exposure, so that it is wet with liquid sunbeams, or, if you will, tremulous with luminous vibrations, when first plunged into the negative bath of darkness, and betrays itself by the light which escapes from its surface.
Becquerel began to experiment with a view to testing this supposition. He placed uranium on a photographic plate which had first been wrapped in black paper in order to screen it from the light. After this plate had remained in the bright sunlight for several hours it was removed from the paper covering and developed.
As to zinc, it may be remembered that the case found at Flotsam Point was lined with this metal, which could not be better utilized than for this purpose. Cyrus Harding, after mature consideration, decided to manufacture a very simple battery, resembling as nearly as possible that invented by Becquerel in 1820, and in which zinc only is employed.
Bernard could not help saying to himself, but, to be sure, he had just been looking at the young girl next him, so that his eyes were brimful of beauty, and may have spilled some of it on the first comer: for you know M. Becquerel has been showing us lately how everything is phosphorescent; that it soaks itself with light in an instant's exposure, so that it is wet with liquid sunbeams, or, if you will, tremulous with luminous vibrations, when first plunged into the negative bath of darkness, and betrays itself by the light which escapes from its surface.
The researches on radioactive substances have their starting-point in the discovery of the rays of uranium made by M. Becquerel in 1896. As early as 1867 Niepce de St Victor proved that salts of uranium impressed photographic plates in the dark; but at that time the phenomenon could only pass for a singularity attributable to phosphorescence, and the valuable remarks of Niepce fell into oblivion.
Becquerel had no idea of such radiations, had never thought of their possibility. In the early days of the Roentgen rays there were many facts which suggested that phosphorescence had something to do with the production of these rays It then occurred to several French physicists that X-rays might be produced if phosphorescent substances were exposed to sunlight.
The metal uranium has been classed with the elements since it was isolated in 1840. In 1896, Becquerel found that compounds of uranium, and also the metal itself, are radio-active.
This is the case with gases themselves, as demonstrated, for example, by a very elegant experiment of M. Becquerel on the dispersion of the vapour of sodium. Moreover, it may happen that yet more complications may be met with, as no substance is transparent for the whole extent of the spectrum.
Studying the action of the salts of a rare and very heavy mineral called uranium Becquerel observed that their substances give off an invisible radiation which, like the Roentgen rays, traverse metals and other bodies opaque to light, as well as glass and other transparent substances. Like most of the great discoveries it was the result of accident.
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