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Updated: May 16, 2025
The grains of sandstone are held together by some cement. This may be calcareous, consisting of soluble carbonate of lime. In brown sandstones the cement is commonly ferruginous, hydrated iron oxide, or iron rust, forming the bond, somewhat as in the case of iron nails which have rusted together.
Barium sulphate, 100 parts; chromic oxide, 20 to 50; finished lacquer, 40 to 50; solvent, 20. This is dried for about 10 minutes at 160° C. Yellow. Barium sulphate, 100 parts; lead chromate, 40; finished lacquer, 40; solvent, 20. This is dried for about 15 minutes at 150° C. Almost all pigments other than the above-mentioned are blackened by contact with lacquer or suspend its drying quality.
It is occasionally administered in doses of from 10 to 15 grains in obstinate diarrhoea. In some obstinate cases, alum whey has been employed in the form of a clyster. 'Oxide of Antimony', in the form of a compound powder, and under the name of James's powder, is employed as a sudorific, or to cause a determination to the skin.
Under the blowpipe it immediately becomes white, and emits a strong animal odour, like that from fresh shells. It is chiefly composed of carbonate of lime; when placed in muriatic acid it froths much, leaving a residue of sulphate of lime, and of an oxide of iron, together with a black powder, which is not soluble in heated acids.
To discover by the spectroscope the smallest quantity of a gaseous or very volatile hydrocarbon, the Messrs. Negri introduce a small quantity of the gaseous mixture into a tube. This mixture should not contain oxygen, carbonic oxide, or carbonic acid; and the pressure is to be reduced to not more than twenty millimetres.
In the '40's, Bunsen, the German chemist, combined oxide of cacodyl with cyanogen, a radical of prussic acid, producing cyanide of cacodyl, or diniethyl arsine cyanide. As both of its components are of the deadliest description, it is extremely dangerous to make. It can be made only in the open air, and not without the most extreme precaution known to science. Mr.
For example, the gravimetric determination of aluminium is accomplished by solution of the sample, by precipitation in the form of hydroxide, collection of the hydroxide upon a filter, complete removal by washing of all foreign soluble matter, and the burning of the filter and ignition of the precipitate to aluminium oxide, in which condition it is weighed.
Having your silvering solution ready, which is to be somewhat diluted with water, next take two swabs, with handles about 12 inches long, dip the first into a basin containing dilute nitric acid, and rub it rapidly over about a foot of the surface of the plate; the oxide of copper will be absolutely removed, and the surface of the copper rendered pure and bright; then take the other swab, wet with the dilute nitric of mercury, and pass it over the clean surface, rubbing it well in.
The second, on the contrary, is formed almost wholly of oxide of iron with but little gangue and only traces of oxide of manganese. The following are analyses of these two varieties of ore: Friable Ore.
Two or three thousand of the first experiments followed the line of his well-known primary battery in the attempted employment of copper oxide as an element in a new type of storage cell; but its use offered no advantages, and the hunt was continued in other directions and pursued until Edison satisfied himself by a vast number of experiments that nickel and iron possessed the desirable qualifications he was in search of.
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