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Updated: July 1, 2025
At a speed of 2.2 meters per second the tractive stress, K, is from 10 to 11 kilogrammes. At a speed of 13.5 kilometers per hour, or 3.75 meters per second, the engine develops a power of 12 horses. The piston is 19 centimeters in diameter, and has a stroke of 15 centimeters. The shaft, in common, of the pump and engine makes 410 revolutions per minute.
In order to facilitate the disengagement of hydrogen during the reaction, care must be taken to form apertures in the zinc plates, and to incline the first lower row with respect to the bottom of the vessel. A cubical pile of 150 hectoliters contains 105 rows of No. 16 flat and corrugated zinc plates, whose total weight is 6,200 kilogrammes.
The mean consumption of coal per 24 hours for the twenty days preceding the 18th of November was 86,060 kilogrammes. After this date the regular consumption was as follows: Nov. 19.................31,800 kilogrammes. It must be remarked that in the perfectly regular running of the sugar works, nothing was changed saving the setting of this evaporating apparatus running.
The water escapes in a thin and even sheet as soon as the tractive stress exceeds 2,000 kilogrammes; and the intensity and size of the eddies from the boat sensibly diminish in measure as the speed increases. The interesting experiments made by Mr. Thus is explained the great interest that attaches to Mr.
An immense god-send to the Gaboon, it is well known to be the most productive of all food, 100 square yards of it giving annually nearly 2,000 kilogrammes of food far more nutritious than the potato. Here it is the musa sapientum, the banana de Soa Thome, which has crossed over to the Brazil, and which is there known by its sharper leaves and fruit, softer and shorter than the indigenous growth.
Stewart, one hectare would yield 1760 kilogrammes of coarse sugar; for such is the quality of the sugar furnished for commerce at Jamaica. A hectare of good soil, sown or planted with beet-root, produces in France from ten to thirty thousand kilogrammes of beet-root. The mean fertility is 20,000 kilogrammes, which furnish 2 1/2 per cent, or five hundred kilogrammes of coarse sugar.
In the same year 1790, an aërolite weighing ten kilogrammes fell in Gascony. It was observed by a large number of persons, and an official report, signed by three hundred witnesses, was sent to the Academy of Paris. The reply was that "it had been very amusing to receive a legal document dealing with such an absurdity."
It appears that the total exportation of coffee from the archipelago of the West Indies, by lawful means only, now amounts to more than thirty-eight millions of kilogrammes; nearly five times the consumption of France, which, from 1820 to 1823, was, on the yearly average, 8,198,000 kilogrammes. The consumption of Great Britain is yet* only 3 1/2 millions of kilogrammes.
In summer, from 120 kilogrammes of the wood 2.4 kilogrammes, or 2 per cent. of the solid camphor are obtained in one day, while in winter, from the same amount of the wood, 3 kilogrammes, or 2.5 per cent., of camphor are obtainable at the same time.
Chemistry has, since that period, succeeded in overcoming those difficulties; and, in the year 1812, France alone had more than two hundred beet-root sugar factories working with very unequal success and producing a million of kilogrammes of coarse sugar, that is, a fifty-eighth part of the actual consumption of sugar in France.
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