Information Circular1950 - Mines and mineral resources |
From inside the book
Results 1-5 of 100
Page 3
... testing a dust respirator for approval , The ability of the filter to remove dust efficiently is determined by ... test to assure that this resistance does not exceed a pressure head equivalent to 2 inches of water when air is drawn ...
... testing a dust respirator for approval , The ability of the filter to remove dust efficiently is determined by ... test to assure that this resistance does not exceed a pressure head equivalent to 2 inches of water when air is drawn ...
Page
... testing of respiratory protective devices ... Approvals and extensions of approvals granted ... Tests to determine quality of approved devices .. Questionnaire regarding the approval of paint- spray respirators ... 1 / Chief , Health ...
... testing of respiratory protective devices ... Approvals and extensions of approvals granted ... Tests to determine quality of approved devices .. Questionnaire regarding the approval of paint- spray respirators ... 1 / Chief , Health ...
Page 1
... testing of respiratory protective devices ... Approvals and extensions of approvals granted ... Tests to determine quality of approved devices .. Questionnaire regarding the approval of paint- spray respirators ... 1 / Chief , Health ...
... testing of respiratory protective devices ... Approvals and extensions of approvals granted ... Tests to determine quality of approved devices .. Questionnaire regarding the approval of paint- spray respirators ... 1 / Chief , Health ...
Page 9
... tests were made of a commercial electric - methane indicator . The results of this investigation should prove of interest to coal - mine inspectors and others concerned with the reliability of such instruments as are used in examination ...
... tests were made of a commercial electric - methane indicator . The results of this investigation should prove of interest to coal - mine inspectors and others concerned with the reliability of such instruments as are used in examination ...
Page 11
... testing and approval . Tests to Determine Quality of Approved Devices Check tests an approved gàs - mask canisters showed one approved type that did not meet the performance requirements of the Bureau of Mines schedule under which it ...
... testing and approval . Tests to Determine Quality of Approved Devices Check tests an approved gàs - mask canisters showed one approved type that did not meet the performance requirements of the Bureau of Mines schedule under which it ...
Common terms and phrases
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