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" Six months' constant experience with this sampler has shown that 10 per cent, of 20 per cent., or 2 per cent, of the original... "
Modern American Methods of Copper Smelting - Pagina 31
door Edward Dyer Peters - 1891 - 398 pagina’s
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Transactions

American Institute of Mining, Metallurgical, and Petroleum Engineers, American Institute of Mining Engineers - 1885 - 918 pagina’s
...over all of the other systems, which require that the ore must be rolled before a sample can be taken. The two machines are driven at different speeds, to prevent any possible error which might arise from isochronal motion. In testing these machines by re-sampling various lots of...
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Transactions of the American Institute of Mining Engineers, Volume 13

American Institute of Mining Engineers - 1885 - 918 pagina’s
...over all of the other systems, which require that the ore must be rolled before a sample can be taken. The two machines are driven at different speeds, to prevent any possible error which might arise from isochronal motion. In testing these machines by re-sampling various lots of...
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A Manual of Practical Assaying

John Mitchell (F.C.S.) - 1888 - 1002 pagina’s
...though in exceptional cases, 15 per cent, of 30 per cent., or 4^ per cent, of the ore may be required. The two machines are driven at different speeds, to...limit of error has been found less than one-fourth of 1 per cent. ; while even the best handsampling may vary 2 per cent. The fact that the division is one...
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Modern Mechanism: Exhibiting the Latest Progress in Machines, Motors, and ...

Park Benjamin - 1892 - 962 pagina’s
...elevated, and again reduced by dropping through another spout equipped with a sampler of the same design. The two machines are driven at different speeds to prevent any possible error that Flo. 1. — Bnmton's automatic sampler. might result from isochronal motion. Experience has shown that...
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Modern Mechanism: Exhibiting the Latest Progress in Machines, Motors, and ...

Park Benjamin - 1892 - 970 pagina’s
...eleva*-0 and again reduced by dropping through another spout equipped with a sampler of the design. The two machines are driven at different speeds to prevent any possible error might result from isochronal motion. Experience has shown that 10 percent, of 20 per cent., or 2 per...
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Modern Copper Smelting

Edward Dyer Peters - 1898 - 742 pagina’s
...machine, from which the final sample drops into a locked bin, to be pulverized and quartered by hand. The two machines are driven at different speeds, to prevent any possible error that might rise from isochronal motion. A still more recent invention of Mr. Brun^on's is the quartering shovel,...
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