 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 - Page 68by Geological Survey (U.S.) - 1907Full view - About this book
 | Geology - 1907 - 1026 pages
...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 - Granite - 1907 - 240 pages
...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 - Geology - 1907 - 700 pages
...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 - Granite - 1908 - 458 pages
...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 - Granite - 1908 - 250 pages
...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... | |
 | Mineral industries - 1907 - 452 pages
...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 - Building stones - 1912 - 588 pages
...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.... | |
 | United States - 1907 - 1200 pages
...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 pages
...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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