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Updated: May 2, 2025
It is not advantageous to withdraw the whole amount of energy put in; although its charging capacity is as much as 370 ampere hours, we do not use more than 80 per cent., or 300 ampere hours; hence, if we discharge these accumulators at the rate of 40 amperes, we obtain an almost constant current for 71/2 hours: one cell gives an E.M.F. of two volts.
In the experiments recently tried with Mr. Scrivanow's pile, a large sized battery was made use of, whose dimensions were 300 x 145 x 125 millimeters, and whose weight was from 5 to 6 kilogrammes. The results were: intensity, 1 ampere; electro-motive power, 25 volts, corresponding to an energy of 25 volt-amperes, or about 2.5 kilogrammeters per second.
Thus did Ampère express himself. The illustrious physicist rightly considered the results obtained by him through following this wise method as worthy of comparison with the laws of attraction; but he knew that when this first halting-place was reached there was still further to go, and that the evolution of ideas must necessarily continue.
Some thirty-four distinctions and diplomas of home or foreign societies bore witness to his scientific reputation. Since 1836 he had been a Fellow of the Royal Society, and in 1873 he was appointed a Foreign Associate of the French Academy of Sciences. The same year he was awarded the Ampere Medal by the French Society for the Encouragement of National Industry.
Because one happens to be a fairy, one is none the less a woman, I said to myself; and since Madame Recamier, according to what I heard J. J. Ampere say, used to blush with pleasure when the little chimney- sweeps opened their eyes as wide as they could to look at her, surely the supernatural lady seated upon the "Cosmography of Munster" might feel flattered to hear an erudite man discourse learnedly about her, as about a medal, a seal, a fibula, or a token.
In the evening it was a little world that met there. The names of Ampere, Tocqueville, Montalembert, Merimee, Thierry, and Sainte-Beuve suggest the literary quality of this circle, in which were seen from time to time such foreign celebrities as Sir Humphry and Lady Darcy, Maria Edgeworth, Humboldt, the Duke of Hamilton, the gifted Duchess of Devonshire, and Miss Berry.
Great praise of the poetical and literary excellence of these times, although M. de Barante was not conscious of it. April 22, 1847. Election of M. Ampere. This is an improvement upon the last. A slow improvement. But Academies, like old people, go slowly.
An electro-magnet excited by a tiny battery of 10 volts, and, say, one ampere of current, may be able to hold a tremendous weight in suspension, although the energy consumed amounts to only 10 watts, or less than 1/75 of a horse power, but the suspended weight produces no mechanical work.
After Des Brosses, we are ready for Henri Beyle, and Ampere, and Hillard, and About, and Gallenga, and Julia Kavanagh; "Corinne" only makes us hungry for George Sand. That no one can tell us anything new is as undeniable as the compensating fact that no one can tell us anything too old.
The unit of electromotive force is the volt, and this is the electric pressure which will force a current of 1 ampere through a resistance of 1 ohm; it is expressed by the symbol E. A fresh dry cell will deliver a current of about 1.5 volts. Resistance and the Ohm.
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