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"With Leverrier's bad English and my bad French we talked but little, but he showed me the transit instrument, the mural circle, the computing-room, and the private office. He put on his cloak and cap, and said, 'Voila le directeur! "One room, he told me, had been Arago's, and Arago had his bed on one side.
She owed nothing to foreign influences, which justified the remarkable proposition of Arago's, "No action exterior to the moon has contributed to the production of her relief." However that may be in its actual condition, this world was the image of death without it being possible to say that life had ever animated it.
In an ordinary thermometer Mercury freezes hard when exposed to a temperature of 40° below zero. But Barbican had provided himself with a Minimum, self-recording thermometer, of a peculiar nature, invented by Wolferdin, a friend of Arago's, which could correctly register exceedingly low degrees of temperature.
My limits however, prevent me from here reproducing, as I might, sundry other recent narratives more or less analogous to that of the girl Cottin. To one only shall I briefly advert: a case related in the Paris newspaper, the "Siècle," of March 4, 1846, published when all Paris was talking of Arago's statement in regard to the electric girl.
But in 1831 he began a series of experiments that established forever the fact of electro-magnetic induction. In his famous paper, read before the Royal Society in 1831, Faraday describes the method by which he first demonstrated electro-magnetic induction, and then explained the phenomenon of Arago's revolving disk.
Instruction! this is also M. Arago's word to the workingmen; it is the principle of all progress. Instruction! . . . . It should be known once for all what may be expected from it in the solution of the problem before us; it should be known, I say, not whether it is desirable that all should receive it, this no one doubts, but whether it is possible.
Le Verrier attained so much fame by this discovery, that when, in 1854, Arago's place had to be filled at the head of the great Paris Observatory, it was universally felt that the discoverer of Neptune was the suitable man to assume the office which corresponds in France to that of the Astronomer Royal in England.
As long ago as 1716, Halley had conjectured that the Northern Lights were due to magnetic "effluvia," but there was no evidence on the subject forthcoming until Hiorter observed at Upsala in 1741 their agitating influence upon the magnetic needle. That the effect was no casual one was made superabundantly clear by Arago's researches in 1819 and subsequent years.
Some four years after Arago's discovery, Sturgeon made the first "electro-magnet" by winding a soft iron core with wire through which a current of electricity was passed. This study of electro-magnets was taken up by Professor Joseph Henry, of Albany, New York, who succeeded in making magnets of enormous lifting power by winding the iron core with several coils of wire.
Brinckley's face when he hears of a thing he much approves, immediately appeared in Monsieur Arago's face, and he said Karamania was, of all the books of travels he had seen, that which he admired the most: that he had admired it for its clearness, its truth, its perfect freedom from ostentation.
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