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From the corrected volumes of the two standard solutions, and their relations to normal solutions, calculate the percentage of chromium in the ore. It attacks iron and nickel as well; but crucibles made from these metals may be used if care is exercised to keep the temperature as low as possible.
It had once belonged to Antonio Exili, who had caused it to be made, ostensibly for the safe-keeping of his cabalistic formulas and alchemic preparations, when searching for the philosopher's stone and the elixir of life, really for the concealment of the subtle drugs out of which his alembics distilled the aqua tofana and his crucibles prepared the poudre de succession.
With this they stirred the boiling metal in their crucibles, taking care to accompany the operation with many ceremonies, to divert attention from the real purpose of the manoeuvre. They also drilled holes in lumps of lead, into which they poured molten gold, and carefully closed the aperture with the original metal. Sometimes they washed a piece of gold with quicksilver.
But the ones I should most appreciate knowing are the ones who have known the most of these knocks who have faced the great crises of life and have been tried in the crucibles of affliction. For I am learning that these lives are the gold tried in the fire. The Sorrows of the Piano See the piano on this stage? Good evening, Mr. Piano. I am glad to see you.
Along the walls were cabinets, plain or glass-fronted, through which were visible microscopes, special photographic apparatus, and a large quantity of crystals. Rouletabille, who was ferreting in the chimney, put his fingers into one of the crucibles. Suddenly he drew himself up, and held up a piece of half-consumed paper in his hand. He stepped up to where we were talking by one of the windows.
The hum of industry was ever to be heard; the picks of the miners were constantly at work; the great stamps that had been erected loudly pounded up the ore; and the nights that had been dark and lonely out there in the plains were now illumined, and watched with wonder by the roving Apaches, when the great silver furnaces glowed and roared as the precious metal was heated in the crucibles before being poured into the ingot-making moulds.
I think he was unmarried, without domestic ties, and lived almost night and day among his crucibles and retorts, devoted to his science and pupils toward whom he showed a regard almost fatherly. In his lecture-room, in more formal dress he was less picturesque, but still a man to arouse deep interest.
If, however, the solutions of such ores are treated with sulphureted hydrogen or sulphurous acid, instead of zinc or stannous chloride to reduce the iron, and the excess reducing agent removed by boiling, an accurate determination of the iron can be made. PROCEDURE. Grind the mineral to a fine powder. Weigh out two portions of about 0.5 gram each into small porcelain crucibles.
Maybe in all these philosophers' crucibles there are one or two ounces of gold; but all the rest is residue, dull mud, from which nothing can be born. It seems to me that the Greeks our masters wrote much more to show their intelligence than that they used their intelligence in order to learn.
But we must carry out his wishes to the letter, else he will always believe that the experiments might have succeeded if he had stayed here." "Of course," said Zorzi. "We should make tests of all three crucibles to-day, if it is only to make more room for the things that are to be put in." "Where is the copper ladle?" asked Marietta. "I do not see it in its place." "I have none I had forgotten.
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