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Books Bücher 1 - 8 von 8 in A sheet of several acres in extent may be raised in this manner, affording a bed...
" A sheet of several acres in extent may be raised in this manner, affording a bed plane approximately horizontal, to which the quarrymen can work, thus securing stone of any required thickness. "
Bulletin - Seite 159
von North Carolina. Division of Mineral Resources - 1906
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Proceedings of the Good Roads Institute, Held at the University ..., Bände 1-15

Good Roads Institute, Chapel Hill, N.C. - 1897
...directions from the lift hole until the crevice extends a distance of 75 feet or more from the hole. acres in extent may be raised in this manner, affording...compressed air was used a pressure of 80 pounds was admittcjl into the cavity which had previously been extended to a distance of 100 feet from the lift-hole....
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Mine and Quarry, Bände 1-5

1906
...out upon the hillside in a thin edge, as indicated by the cross sectional sketch referred to above. A sheet of several acres in extent may be raised in...a bed plane approximately horizontal, to which the quarry Thin edge of sheet split from quarry men can work, thus securing stone of any required thickness....
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Minutes of Proceedings of the Institution of Civil Engineers, Band 166

Institution of Civil Engineers (Great Britain) - 1906
...gradually admitted, and the cleavage is rapidly extended till it comes out on the hillside in a thin edge. A sheet of several acres in extent may be raised in this manner, affording a bed -plane that is approximately horizontal, from which the quarrymen can break out blocks of any required thickness....
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Bulletin - United States Geological Survey, Ausgabe 426

Geological Survey (U.S.) - 1910
...is gradually admitted and the crack is rapidly extended until it comes out on the hillside. A sheet several acres in extent may be raised in this manner,...horizontal, to which the quarrymen can work, thus obtaining stone of any required thickness. The first time this method was used, air under a pressure...
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The Explosibility of Coal Dust

George Samuel Rice, Joseph Christie Whitney Frazer, Axel Larsen, Frank Haas, Carl Scholz - 1910 - 186 Seiten
...is gradually admitted and the crack is rapidly extended until it comes out on the hillside. A sheet several acres in extent may be raised in this manner,...horizontal, to which the quarrymen can work, thus obtaining stone of any required thickness. The first time this method was used, air under a pressure...
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Civil Engineers' Pocket Book: A Reference-book for Engineers, Contractors ...

Albert Irvin Frye - 1913 - 1611 Seiten
...gradually admitted and the cleavage rapidly extended until it comes out upon the hillside in a thin edge. A sheet of several acres in extent may be raised in this manner, atfording a bed plane approximately horizontal, to which the quarrymen can work, thus securing stone...
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Proceedings of the Good Roads Institute, Held at the University ..., Bände 33-37

Good Roads Institute, Chapel Hill, N.C. - 1913
...gradually admitted and the cleavage rapidly extended until it comes out upon the hillside in a thin edge. A sheet of several acres in extent may be raised in this manner, affording a bed PLATE XI. i rry- isSi\ving methods of quarrying by means of * ui£v __•_i! air. •|a at Mount Airy...
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Minutes of Proceedings of the Institution of Civil Engineers, Band 166

Institution of Civil Engineers (Great Britain) - 1906
...gradually admitted, and the cleavage is rapidly extended till it comes out on the hillside in a thin edge. A sheet of several acres in extent may be raised in this manner, affording a bed-plane that is approximately horizontal, from which the quarrymen can break out blocks of any required...
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