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Updated: May 2, 2025
The price of the element is lower than would be expected at first sight from the employment of so expensive a metal. The present cost of sodium is 10 frs. per kilogramme; but M. Jablochkoff thinks that on the large scale the metal might be obtained at a very low figure. The elements are grouped in sets of ten, hung upon rods in such a manner that the solution as formed may drain off.
Carbonates of strontia and of baryt, obtained by a new process, will shortly be sold in Paris at 3 francs the kilogramme. This discovery is expected to have a great influence on several important arts, such as the manufacture of glass, of soap, &c. Articles of furniture, jewellery, and every branch dependent on design, are now remarkable for a purer taste than that which they formerly exhibited.
"Then an ordinary pair of scales, being under the influence of attraction, I suppose, would not answer your purpose," submitted the lieutenant. "And the very kilogramme weight you used would have become lighter," put in the count, deferentially. "Pray, gentlemen, do not interrupt me," said the professor, authoritatively, as if ex cathedra. "I need no instruction on these points."
The same objections have been made to the definition of the kilogramme, at first considered as the mass of a cubic decimetre of water at 4° C., as to the first definition of the metre. Very remarkable researches have been carried out with regard to this determination by the International Bureau, and by MM. Macé de Lépinay and Buisson.
The law of the 11th July 1903 has definitely regularized the custom which physicists had adopted some years before; and the standard of mass, the legal prototype of the metrical system, is now the international kilogramme sanctioned by the Conference of Weights and Measures. The comparison of a mass with the standard is effected with a precision to which no other measurement can attain.
Besides, the fact that the founders abstained from indicating any specified spot in the definition of the kilogramme, when they were perfectly acquainted with the considerable variations in the intensity of gravity, leaves no doubt as to their real desire.
On the other hand, the bread allowance had been raised from 750 grammes to a kilogramme per diem, and a great deal of bread was given to the horses as food. Somewhat uncertain communications had been opened with the provinces by means of pigeon-post, the first pigeon to bring despatches into the city arriving there on November 15.
I find that he is only a third to half the size of the other sex, as far as I can judge by sight alone. To obtain exactly the respective quantities of substance, I should need delicate balances, capable of weighing down to a milligramme. My clumsy villager's scales, on which potatoes may be weighed to within a kilogramme or so, do not permit of this precision.
Professor Rosette was manifestly right in asserting that such a machine would register results quite independently of any change in the force of attraction. On the earth it would have registered a kilogramme as a kilogramme; here it recorded a different value altogether, as the result of the altered force of gravity.
Amounts of heat were thus detected in less than ten seconds, which, expended during a thousand years on the melting of a kilogramme of ice, would leave a part of the work still undone; and further improvements rendered this marvellous instrument capable of thrilling to changes of temperature falling short of one ten-millionth of a degree Centigrade.
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