| 41. | In the first half of the 19th century there were many disasters, many caused by firedamp and inadequate ventilation.
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| 42. | He reasoned that a lamp in a chimney could create a sufficient updraft that firedamp would not penetrate down the chimney.
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| 43. | Previous experimenters had used coal gas ( chiefly carbon monoxide ) incorrectly, believing it to be the same as firedamp.
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| 44. | If firedamp is drawn into the flame it will burn more brightly and if the proportions are correct may even detonate.
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| 45. | Such an incident occurred at Nicholson Pit in 1856 on a lamp being used by an overman to test for firedamp.
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| 46. | Later models had graduated shields by which the deputy could determine the concentration of firedamp from the heightening of the flame.
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| 47. | On 1 October 1895 five men including the colliery manager and undermanager died at Shakerley Colliery after an explosion of firedamp.
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| 48. | An explosion caused by firedamp, after poor ventilation allowed a build-up of flammable gas, killed 31 miners.
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| 49. | An explosion of firedamp, ignited by a safety lamp, in 1858 cost the lives of 25 men and boys.
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| 50. | In 1860, Rouquayrol became concerned with mine safety problems related to firedamp ( flammable natural gases in coal mines ).
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