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Books Bücher 1 - 6 von 6 in The first time this method was used, air under a pressure of 80 pounds was admitted...
" The first time this method was used, air under a pressure of 80 pounds was admitted into the cavity which had previously been extended to a distance of 100 feet from the lift hole. The power of the air, however, was too great for the easily splitting... "
Bulletin - Seite 160
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
...100 feet from the lift-hole. The power of the air, however, was too great for the easily-splitting stone and the cleavage turned abruptly to the surface....means of powder for a hundred feet would require from G to 12 days, and with water from 3 to 5 hours, while with the compressed air the larger area, was...
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Mine and Quarry, Bände 1-5

1906
...manner as before. The compressed air pipe was then attached once more and air admitted very gradually. The stone could soon be heard cracking in all directions, and in about half an hour the eleavage came to the surface in a thin edge on the hillside, some 225 feet from the lift hole. (See...
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Bulletin - United States Geological Survey, Ausgabe 426

Geological Survey (U.S.) - 1910
...admitted into the cavity which had previously been extended to a distance of 100 feet from the lift hole. The power of the air, however, was too great for the...hour the cleavage came to the surface of the hillside about 225 feet from the lift hole. To extend the cleavage by means of powder for 100 feet would require...
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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
...admitted into the cavity which had previously been extended to a distance of 100 feet from the lift hole. The power of the air, however, was too great for the...hour the cleavage came to the surface of the hillside about 225 feet from the lift hole. To extend the cleavage by means of powder for 100 feet would require...
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Journal of the Elisha Mitchell Scientific Society for the Year ...., Band 22

1906
...gradually and the s'.?::.- c .- "c1 r-'>r:i be. heard cracking in all directions and in al.^.'. .-"-If an hour the cleavage came to the surface of the hillside...cleavage by means of powder for a hundred feet would re<y>-i're from 6 to 12 days, and with water from 3 to 5 hours, while with the compressed air the larger...
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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
...the next hole, however, the compressed air was admitted very gradually, and the stone could soon he heard cracking in all directions, and in about half...the hillside as a thin edge some 225 feet from the lift hole. To extend the cleavage by means of powder for 100 feet would require from six to twelve...
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