Explosions in Coal Mines

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Longmans, Green & Company, 1886 - 144 páginas
 

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Página 9 - ... diameter at the base, and having a conical speck of yellow in the middle near the top;" this flame was then exposed in mixtures of fire-damp and air, the proportion of each being known.
Página 9 - A conical cap i to f inch high. "1 to 30 — A conical cap f inch high. "1 to 40— A conical cap W to i inch high. "1 to 50 — An exceedingly faint cap £ inch high, the top having the appearance of having been broken off. "1 to 60 — It was hardly possible to distinguish anything above the small oil flame ...
Página 137 - A representation of this tree is given in the first volume of the " Transactions of the Natural History Society of Northumberland, Durham, and Newcastle.
Página 72 - Had the explosion occurred after these men had descended, the loss of life would have been much greater than it was.
Página 29 - Also, the data suggest that status inconsistencies involving high occupational rank and low educational rank are more closely associated with liberal tendencies than the reverse. However, in view of the small number of cases in each cell it is necessary to use considerable caution in drawing conclusions from the present data regarding which patterns of relationships are most closely associated with political liberalism.
Página 21 - The rapid paf sage of cars against the air-current raises a cloud of dust from them ; the passage of men and horses stirs up the bottom dust ; the hewer at the working face raises about him a thin cloud of dust ; the concussion of a blast, or wave of air caused by a heavy fall of stone, fills the air with dust ; but in the absence of some such cause the dust is quiescent, and after its disturbance by any cause it soon settles down again. The fine, soot-like, upper dust is, however, extremely inflammable,...
Página 67 - ... allow of the passage of the flame. This the authors say was the most considerable explosion of fire-damp and air that they are acquainted with. They have personally investigated during the last twelve years almost all the explosions occurring in the North of England, and they cannot point to a case where there was direct evidence of so large a quantity of fire-damp and air exploding. The moral of all this is obvious. It can scarcely be gainsaid that some of the most disastrous explosions of the...
Página 109 - ... a wave of air preceding the explosion and filling the air in the roads with coal-dust, (2) flame following instantly into compressed air charged with dust. Various popular ideas about explosions, such as that they ' face the wind ' or travel against the fresh air, favor the coal-dust theory. Under the head of remedial measures, the authors of the report note that wateiing...
Página 21 - ... This is not so, except to a limited extent. The velocity of the air is rarely sufficient to carry dust any considerable distance. When dust is largely present in the air, it is due to some disturbing cause other than the ordinary movement of the air. The rapid passage of cars against the air-current raises a cloud of dust from them ; the passage of men and horses stirs up the bottom dust ; the hewer at the working face raises about him a thin cloud of dust ; the concussion of a blast, or wave...
Página 105 - ... lamps. At Seaham, Tudhoe, West Stanley, and Usworth the explosions were simultaneous with the firing of shots in stone ; in these cases the explosions occurred when the pits were occupied by stonemen and repairers and at the only time when the operations of the mines allowed the firing of shots. At Seaham, Tudhoe, and Usworth the shots were fired on a main intake air-road and at points where currents of air of between 20,000 and 30,000 cubic feet per minute were passing. At West Stanley the shot...

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