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Books Bücher 1 - 10 von 12 in ... 10 to 25 per cent, of the amount quarried is salable as slate. The remaining...
" ... 10 to 25 per cent, of the amount quarried is salable as slate. The remaining 75 to 90 per cent, is of no service to the slate miner. It is sent to the dump heap and is a continual source of trouble and expense. "
Congressional Serial Set - Seite 39
1904
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Bulletin, Ausgaben 275-280

1906
...that only about 10 to 25 per cent of the amount quarried is salable as slate. The remaining 75 to 90 per cent is of no service to the slate miner. It is...material, however, as can be seen from the analyses (juoted be-low, is often admirably adapted for use in connection with limestone in a Portland cement...
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Bulletin, Ausgaben 241-244

1904
...that only about 10 to 25 per cent of the amount quarried is salable as slate. The remaining 75 to 90 per cent is of no service to the slate miner. It is...obtained very cheaply by the cement manufacturer. Cnrnponillon nf American roofing slate*. VALUE OF DEPOSITS OF CEMENT MATERIALS. The determination of...
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The Materials and Manufacture of Portland Cement. By Edwin C. Eckel: The ...

Edwin Clarence Eckel, Eugene Allen Smith - 1904 - 93 Seiten
...that only about 10 to 25 per cent. of the amount quarried is salable as slate. The remaining 75 to 90 per cent. is of no service to the slate miner. It...admirable for use, in connection with limestone, in a Portland cement mixture. As it is a waste product, it could be obtained very cheaply by the cement...
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Experiments on Schistosity and Slaty Cleavage

George Ferdinand Becker - 1904 - 34 Seiten
...that 011)3' about 10 to 25 per cent of the amount quarried is salable as slate. The remaining 75 to 90 per cent is of no service to the slate miner. It is...and" expense. This very material, however, as can lie seen from the analyses ({noted below, is often admirable for use, in connection with limestone,...
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Cements, limes, and plasters: their materials, manufacture, and properties

Edwin Clarence Eckel - 1905 - 712 Seiten
...quarried is salable as slate. The remaining 75 to 90 per cent is of no service to the slate-miner. It is sent to the dump heap, and is a continual source...obtained very cheaply by the cement manufacturer. Geographic distribution of slates. — The principal areas in the United States in which roofing slate...
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Iowa Geological Survey, Band 15

1905
...twenty-five per cent of the amount quarried is salable as slate. The remaining seventy-five to ninety per cent is of no service to the slate miner. It is...admirable for use. in connection with limestone, in a Portland cement mixture. AS it is a waste product, it could be obtained very cheaply by the cement...
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Bulletin - United States Geological Survey, Ausgabe 243

Geological Survey (U.S.) - 1905
...only ¡i bo tit I« to 25 per cent of the amount quarried is salable as slate. The remaining 75 to 90 per cent is of no service- to the slate miner. It...and" expense. This very material, however, as can he seen from the analyses quoted below, is often admirable, for use, in connection with limestone,...
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The Clay Deposits of the Virginia Coastal Plain

Heinrich Ries - 1906 - 184 Seiten
...that only about 10 to 25 per cent, of the amount quarried is salable as slate. The remaining 75 to 90 per cent, is of no service to the slate miner. It...admirable for use, in connection with limestone, in a Portland cement mixture. As it is a waste product it could be obtained very cheaply by the cement manufacturer....
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Bulletin - United States Geological Survey, Ausgabe 275

Geological Survey (U.S.) - 1906
...that only about 10 to 25 per cent of the amount quarried is salable as slate. The remaining 75 to 90 per cent is of no service to the slate miner. It is...can be seen from the analyses quoted below, is often admirably adapted for use in connection with limestone in a Portland cement mixture. As it is a waste...
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Slate Deposits and Slate Industry of the United States

Thomas Nelson Dale, Edwin Clarence Eckel, William Francis Hillebrand, Altha Titsworth Coons - 1906 - 154 Seiten
...that only about 10 to 25 per cent of the amount quarried is salable as slate. The remaining 75 to 90 per cent is of no service to the slate miner. It is...dump heap, and is a continual source of trouble and excuse. This very material, however, as can be seen from the analyses quoted below, is often admirably...
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