nd boiling water is poured into the The causes of the spontaneous ignition of coal bave been filter. much inquired into, and several theories propounded there- on. Durand, among others, has maintained that the pres- In order to cleanse it thoroughly it is ence of pyrites in the coal isa principal… … that’ of the coal rose very quickly, until, after and developed with the addition of a liquid TEXTILE FILTER, COFFEE POT, AND URN. a few hours, ignition took place. Two other containing 5 per cent of acetic acid. ‘To samples of coal and pyrites were then put : facilitate the inking, it is well to…
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