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Summary and introduction
Distribution of coarse coal dust concentration in 1inch samples
1-inch samples 20 sieve 38.1 INCOMBUSTIBLE CONTENT 4.12 Normal units 65 percent incombustible 95 percent confidence AIRWAYS IN AMERICAN belt entries Bureau of Mines CN CN CN CN f coal and incombustible coal mines coarse coal dust Coarse Dust combustible Contents of Coarse Contents of Float cubic foot DEPOSITS IN RETURN Distribution of Float-Coal Distribution of Incombustible dust collected Dust Concentration dust in return float coal FLOAT DUST DEPOSITS Float-Coal Concentration frequency distribution Kawenski less than 65 Lignite logarithm lognormal m o o c mean incombustible content Mean of samples mean quantity normal distribution Normal units 98.5 Number of samples percent FIGURE percent incombustible content quantity of coal quantity of float return airways roof samples safety engineer samples collected samples were collected sampling locations skim float skim samples Standard deviation statistical surfaces Type of sample units Normal units