 The practice of foremen in the thirty principal granite quarries of Maine, as explained by them to the writer, was found to be as follows: Vertical blast holes almost as deep as the thickness of the sheet are "Bowman, Isaiah, Well-drilling methods: Water...  Bulletin of the United States Geological Survey - Seite 68von Geological Survey (U.S.) - 1907Vollansicht - Über dieses Buch
 | 1907 - 1026 Seiten
...by Daw.'- and a general description of quarry methods will be found in a report by Walter B. Smith." The practice of foremen in the thirty principal granite...Maine, as explained by them to the writer, was found to lx> as follows: Vertical blast holes almost as deep as the thickness of the sheet are • Knwmiin,... | |
 | Thomas Nelson Dale - 1907 - 240 Seiten
...by Daw,6 and a general description of quarry methods will be found in a report by Walter B. Smith." The practice of foremen in the thirty principal granite...methods : Water Sup. and Irr. Paper (in preparation). 1 Daw. AW and KW, The blasting of roeks in mines, quarries, and tunnels, etc., pt. 1, London, 1898.... | |
 | Benjamin Kendall Emerson, Joseph Hartshorn Perry - 1907 - 700 Seiten
...by Daw.'1 and a general description of quarry methods will be found in a report by Walter B. Smith/ The practice of foremen in the thirty principal granite...Maine, as explained by them to the writer, was found to l>e as follows: Vertical blast holes almost as deep as the thickness of the sheet are " riiiwman, iRainh,... | |
 | Thomas Nelson Dale - 1908 - 458 Seiten
...by Daw," and a general description of quarry methods will be found in a report by Walter B. Smith.6 The, practice of foremen in the thirty principal granite...quarries of Maine, as explained by them to the writer, is described in Bulletin 313, pages 69-71. In visiting the (marries described in this bulletin a few... | |
 | Thomas Nelson Dale - 1908 - 250 Seiten
...by Daw," and a general description of quarry methods will be found in a report by Walter B. Smith. 6 The practice of foremen in the thirty principal granite...quarries of Maine, as explained by them to the writer, is described in Bulletin 313, pages 69-71. In visiting the .quarries described in this bulletin a few... | |
 | 1907 - 452 Seiten
...quarryman desires to split the mass are all factors in each problem. The practice of foremen in the 30 principal granite quarries of Maine, as explained...holes almost as deep as the thickness of the sheet are drilled by pneumatic or steam drills along a proposed line of fracture under three sets of conditions.... | |
 | William Arthur Parks - 1912 - 588 Seiten
...faced bit 3£ by £ inch. According to Dale, the practice in the thirty principal quarries in Maine is as follows: — "Vertical blast holes almost as deep as the thickness of the sheet are drilled by pneumatic or steam drills along a proposed line of fracture, under three sets of conditions.... | |
 | 1907 - 1200 Seiten
...by Daw.* and a general description of quarry methods will be found in a report by Walter B. Smith:0 The practice of foremen in the thirty principal granite...holes almost as deep as the thickness of the sheet are * Howman, Isaiitli. Wcll-drillinj; methods: Water Sup. and Irr. Paper (In preparation). * Daw. AW and... | |
 | 1908 - 816 Seiten
...quarryman desires to split the mass are all factors in each problem. The practice of formen in the 30 principal granite quarries of Maine, as explained...holes almost as deep as the thickness of the sheet are drilled by pnueumatic or steam drills along a proposed line of fracture under three sets of conditions.... | |
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