Information Circular1950 - Mines and mineral resources |
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Page 4
... employed .. 3. Record of coal - mine inspections and surveys , December 1 , 1941 , to June 30 , 1949 ... 4. Fatal and nonfatal injuries in coal mines in the United States ... 5. Accident statistics covering coal mines in the United ...
... employed .. 3. Record of coal - mine inspections and surveys , December 1 , 1941 , to June 30 , 1949 ... 4. Fatal and nonfatal injuries in coal mines in the United States ... 5. Accident statistics covering coal mines in the United ...
Page 8
... employed . To date , neither of these methods has proved satisfactory . To obtain large samples of air - borne dust for particle - size determin- ation and X - ray , spectrographic , and petrographic examination , the use of filter ...
... employed . To date , neither of these methods has proved satisfactory . To obtain large samples of air - borne dust for particle - size determin- ation and X - ray , spectrographic , and petrographic examination , the use of filter ...
Page 14
... employed in the Washington office . The Electrical - Mechanical Section of the Health and Safety Division is headquartered at Pittsburgh , Pa . E. J. Gleim , electrical engineer , super- vises the work of the section , and he and 13 ...
... employed in the Washington office . The Electrical - Mechanical Section of the Health and Safety Division is headquartered at Pittsburgh , Pa . E. J. Gleim , electrical engineer , super- vises the work of the section , and he and 13 ...
Page 19
... employed in or associated with the mineral industries . To June 30 , 1949 , Safety Branch motion pictures have been shown 2,854 times to a total of 251,687 persons . Fourteen copies of the revised motion picture " Coal Mine Explosion ...
... employed in or associated with the mineral industries . To June 30 , 1949 , Safety Branch motion pictures have been shown 2,854 times to a total of 251,687 persons . Fourteen copies of the revised motion picture " Coal Mine Explosion ...
Page 32
... employed in the field are directly under the jurisdiction of the supervising engineers of the long- established districts of the Health and Safety Division ; they are head- quartered at strategic places in coal - producing areas in the ...
... employed in the field are directly under the jurisdiction of the supervising engineers of the long- established districts of the Health and Safety Division ; they are head- quartered at strategic places in coal - producing areas in the ...
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13 north 37 south anthracite anthracite mines bituminous coal bituminous-coal and lignite blasting blends Bureau of Mines carbon dioxide carbon monoxide cars catalyst cent mines cent circuit coal bed Coal Mine Inspection coal mines coal-mine inspectors coke concentrate conditions and practices cost County cut and fill D.C. Approval drilling dust allaying electric engineers equipment explosions feet Figure fill stoping fire area fiscal year 1949 fuel gas mask gasification Gunnison County haulage high-volatile Highland Surprise holes hydrogen inches installed investigation Joy Manufacturing June 30 lignite lignite mines loading machine main east entry mechanical method mill mineral mines cent mines Mines Information Circular motor operations oxygen Per-No percent Pine Creek Pittsburgh plant Pocahontas portal properties reports respirators rock dust roof support samples seals shaft SHOSHONE COUNTY shrinkage stoping steel surface surface magazine switch synthesis gas tests timber tons Total tunnel Type underground ventilation volts zinc