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Updated: May 13, 2025
That of M. Jean Becquerel, which would attribute it to the vibration within the atom of both negative and positive electrons, also deserves notice. A popular account of this is given in the Athenæum of 20th April 1907. These laws are simple, but somewhat singular.
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.
Despite the enormous amount of energy given off by radium it seems not to change in itself, there is no appreciable loss in weight nor apparently any microscopic or chemical change in the original body. Professor Becquerel has stated that if a square centimeter of surface was covered by chemically pure radium it would lose but one thousandth of a milligram in weight in a million years' time.
At this end of the line I merely measure the electromotive force developed by the difference in temperature of two similar thermo- electric junctions, opposed. We call those junctions in a thermopile 'couples, and by getting the recording instruments sensitive enough, we can measure one one-thousandth of a degree. "Becquerel was the first, I believe, to use this property.
Becquerel, Ebelman, Brewster, Dumas, Milne-Edwards, Saint-Claire-Deville frequently consulted him upon the most difficult problems in chemistry, a science which was indebted to him for considerable discoveries, for in 1853 there had appeared at Leipzig an imposing folio by Otto Liedenbrock, entitled, "A Treatise upon Transcendental Chemistry," with plates; a work, however, which failed to cover its expenses.
Hence, so far as we can see at present, trees appear to be simply bad conductors, and to have no more influence upon the temperature of their surroundings than is fully accounted for by the consequent tardiness of their thermal variations. Observations bearing on the second of the three points have been made by Becquerel in France, by La Cour in Jutland and Iceland, and by Rivoli at Posen.
The physicists most qualified to effect measurements in these delicate optical questions M. Cornu, Mr Preston, M. Cotton, MM. Becquerel and Deslandres, M. Broca, Professor Michelson, and others have pointed out some remarkable peculiarities. Thus in some cases the number of the component rays dissociated by the magnetic field may be very considerable.
We have the fact that light falling on the platinum electrode of a voltameter generates a current, first observed, I think, by Sir W. R. Grove at any rate, it is mentioned in his "Correlation of Forces" extended by Becquerel and Robert Sabine to other substances, and now being extended to fluorescent and other bodies by Prof. Minchin.
She was already married to M. de Colbert, whose father fell at Corunna. No one was more attentive to me than Dr. Milne-Edwards, the celebrated natural historian. He was the first Englishman who was elected a member of the Institute. I was indebted to him for the acquaintance of MM. Ampère and Becquerel. I believe Dr.
He began his scientific career as assistant to Edmund Becquerel at the Conservatoire des Arts et Metiers at Paris. In the year 1859, after resigning his position at the above named institution, he entered upon his researches in electricity, and has continued them ever since.
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