 The owner or agent of every coal mine shall provide and establish for every such mine an adequate amount of ventilation, of not less than fifty-five cubic feet per second of pure air, or thirty-three hundred feet per minute, for every fifty men at work...  Annual Report of the Commissioner of Labor - 474 페이지저자: United States. Bureau of Labor - 1886전체보기 - 도서 정보
 | California, Theodore Henry Hittell - 1876 - 986 페이지
...every coal mine shall provide and establish for everj- such mine an adequate amount of ventilation, of ) ǀ 6o.r i2j ǴM Ѹ9 N6 ( P x7o $ ( ܺ5 d MVK! l@0= thirty-three hundred feet per minute, for even- fifty men at work in such mine, and as much more as... | |
 | Andrew Roy - 1876 - 436 페이지
...feet per minute." The mining laws of Pennsylvania require that an adequate amount of ventilation, of not less than fifty-five cubic feet per second of pure air, or three thousand three hundred feet per minute for every fifty men at work, and as much more as circumstances... | |
 | Henry Martyn Chance - 1883 - 716 페이지
...for throwing the ventilating current into the face of a breast or heading. The law requires (Sec. 7) "not less than fifty-five cubic feet per second of pure air, or thirty-three hundred feet per minute for every fifty men at work in such mine, and as much more as... | |
 | United States. Census Office. 10th Census, 1880 - 1885 - 742 페이지
...every coal-mine shall provide and establish for every such mine an adequate amount of ventilation, of not less than fifty-five cubic feet per second of pure air, or thirty-three hundred feet per minute, for every fifty men at work in such mine, and аз much more... | |
 | California - 1886 - 992 페이지
...every coal mine shall provide and establish for every such mine an adequate amount of ventilation, of not less than fiftyfive cubic feet per second of pure air, or thirty-three hundred feet per minute, for every fifty men at work in such mine, and as much more as... | |
 | Tennessee. Bureau of Agriculture, Statistics, and Mines - 1887 - 956 페이지
...shall provide and establish for every coal mine and colliery an adequate amount of ventilation, and not less than fifty-five cubic feet per second of pure air, or 3,300 cubic feet per minute, for every fifty men at work in such mine, and as much more as circumstances... | |
 | 1890 - 1078 페이지
...every coal mine shall provide and establish for every such mine an adequate amount of ventilation, of not less than fifty-five cubic feet per second of pure air, or thirty-three hundred feet per minute, for every fifty men at work in such mine, and as much more as... | |
 | 1892 - 774 페이지
...coal mine shall provide and establish for every such coal mine an adequate amount of ventilation of not less than fifty-five cubic feet per second of pure air, or thirty-three hundred feet per minute for every fifty men working in such coal mine, and as much more... | |
 | United States. Bureau of Labor - 1896 - 1396 페이지
...every coal mine shall provide and establish for every such iniuo an adequate amount of ventilation, of not less than fifty-five cubic feet per second of pure air, or thirty-three hundred feet per minute, for every fifty men at work in such mine, and as much more as... | |
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