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Therefore the moulds had to be once more prepared, and the fires rekindled, and the metal remelted, and all the work tediously and toilsomely repeated. The Son of Heaven heard, and was angry, but spake nothing. A second time the bell was cast, and the result was even worse.
"Here the gold is remelted after it has come out of the purifying oven," said Fatia Negra to the girl who pressed close up to him. "Heretofore it required a whole apparatus of boilers and loads and loads of wood to bring it to smelting heat, but since I got that cylinder-stove, ten hundredweights of metal can be melted in ten minutes." "But where does the fire come from?" enquired the girl.
I was there every day, and the men won the lead, others smelted it and cast it into pigs, then the pigs were remelted and the silver extracted and ingots cast, which were stored up, after being stamped and numbered, down in the strong cellar beneath the counting-house floor.
The amount used at home is divided between coinage and manufacture. The quantity coined varies greatly from year to year, eight million ounces being about the average. For manufacturing, jewelry, tableware, chemicals, etc., about twenty million ounces, of which one-fifth is remelted silver, are used.
In most cases, iron melted in a cupola is not so strong as when remelted in an air furnace, and when run into green sand it is not reckoned so strong as when run into dry sand, or loam.
It has been found, by experiment, that iron of which the crushing weight per square inch is about 42 tons, will, if remelted twelve times, bear a crushing weight of 70 tons, and if remelted eighteen times it will bear a crushing weight of 83 tons; but taking its power to resist impact in its first state at 706, this power will be raised at the twelfth remelting to 1153, and will be sunk at the eighteenth remelting to 149.
Bee hives, like much else, were to a degree primitive the wax came from comb crushed in the straining of honey. It was boiled in water to take away the remnant sweetness, then allowed to cool on top the water, taken off, and remelted over clean water, so manipulated as to free it from foreign substances, then molded into cakes.
By using brick, stone, or cement, of which we have practically an unending supply, to take the place of wood, our store of which is rapidly disappearing, we could avoid much of the drain on our mineral resources which are used for paint. As production and price advance a greater quantity of lead is remelted. About 25,000 tons are returned to use each year. Zinc is a whitish metal.
It is melted and remelted, all scraps are used, even the sweepings from the mint and from manufacturing goldsmiths' shops are saved and the gold used. The waste of the world's gold and silver would be much greater but for the use of paper money, bank checks, and notes. Their very general use keeps the gold as a reserve, held in banks and storage vaults much of the time.
The ingots we thus cast had to be filed and the rough projections taken off, the dust and scraps being remelted down with the other portion. It was a tremendous task, though. The plates we managed pretty easily, but the discs had to be cut up first by means of a great hammer and a cold chisel, and the progress we made upon some days was very small.
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