Show BLACK DAMP IN MINES the bureau of mines department of the interior in pursuing investigations looking to greater safety in mining has analyzed samples of the air in many different ai ff erent coal mines in the united states and has studied tho the analyses the results of one phase ot this study are presented in bulletin black damp in mines by G A burrell I 1 W robertson and G G oberfell ob erf ell this study shows how atmospheric air after entering a coal mine loses oxygen and gains carbon dioxide with resulting formation of so called black damp the report also discusses the effects of the constituents of black damp on men on the burning of oil and acetylene lamps and on the of methane the authors state that the term black damp was and still is widely used to designate accumulations of carbon dioxide tout but a more exact definition of black damp as haldane the english physiologist has pointed out is an accumulation of carbon dioxide and nitrogen in proportions larger than those found in atmospheric air the authors prefer Hal danes definition the bulletin treats on the comparison of atmospheric air with mine air effects on man of variations in composition and amount of air effects of temperature and moisture on oil man the action of oxygen in coal the influence of moisture on rate of absorption of oxygen by coal the effect of lowering oxygen and raising carbon dioxide content on of methane air mixtures and the consumption of oxygen and production of carbon dioxide by men and by lights copies of this bulletin may be obtained free of charge by addressing the director of the bureau of mines washington D C |