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SCUIPTCIU ILLUSTRA TlIJ\S.…

CHIT CHAT.

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■ — ,, TO THEI DITOR OF THE…

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■ — TO THE I DITOR OF THE GAZETTE & GUARDIAN. record of another of those painful and hearl-rendim; accidents, which but too frequently occur in mining districts. Without occupying your valuable space with preliminary observations, I proceed at once: first, to consider the conditions of the danger of explosion in a mine; and secondly, notice the best llIet huds of yellt i lation, pr aClised by the most experienced miners. First, the explosioll in amine, arising from gas being ignited by lightening, very rarely occurs, aud should rather be considered by tbe miner, as a possible CA»E than a probable one Secondly, if any part of a wrought mine be laid «a«te; and, perhaps, ne- cessarily left unventilated, the GAS will venerate, accumulate, and there remain in a stagnant-stake, until some concussion of the air takes place in the mine, and forces out upon the naked caudles the hvdrogeii gas. This has been a source of many accidents, alld therefore should be as much as pos- sible guarded against. There will almost una- voidably occur some circumstances that will render it needful for the most judicious manager thus to leave a part of the mine that has been wrought. unventilated, that he may carry his air more efficiently into the working part; but such circum- stances should be provided for, and if possible avoided. The concussions of the air arise from stones falling from the roor of the rnifl, alld some- times from something vei V large failing down the shaft. In my next I shall say more on this part ot the subject. Thirdly, when any part of a working- mine becomes so foul, that it would be hazardous to go into it with a candle, then DANGER is near and that in proportion to the extent of the inaccessible part. This may occasionally occur in the BEST conducted mint*, and would seem to have been the case at Blaina. When, however, this does happen, the agent should have the entrance well railed oir, or otherwise guarded, against llie ENTRANCE ot strangers aud thoughtless men and boys. Fourthly, "hen lhe comes off from some unperceived avenue, upon the miners'naked caudles, and in a state undiluted and unmixed, or in this state should come on those stationary lights so oftclI fonnd in mille, or "hould it come upon the furnace in this state, then immediate danger is the resuit. This sort ot danger cannot ill many cases be observed the eaulious agellt or miner ought always to keep a good look out, by I frequently examining his candle ;IND his air. Fifthly, if the wind be found from the S.W., or the weather be hazy, or very hot, theii, generally, the mine ig ill d dangerous "tate or condition. More of Ihe lIydroget;ga. will be seen upon the candles, and the furnace will be less capab'e of doing lis office, as a necessary acnt in ventilation; because of Ihe rarefaction of the atmospheric air. Thrll otlK-r, aud, if possible, extra eXHtiGII" should be made to ensure safety, and carry otf the noxious gas. Sixthly, attention should be paid to the perfect state of the lamps, a also to their cleanliness and freedom from oil. Every person, havilt charge of the lamps or mine, should see and examine them every day, before they are used, and, besides, should see (hem often duriBg the day. LeI Iwl boys huve charge of the limps, nor lei them be stationed where any fall of coal or stone is likely to take plac«; neither should they be put so a* to come in contact with any tub, corf, or tram. Seventhly, if any mine hecome n foul as to render it ulIsafe to have candles, then none should persist in using them, but lamps should be got immediately. Nor should any lw disposed to pendst iu tryin how far they can go wilha light ere the gas takes the candle, unless it be in a place where no serious result shall happen. N'or should lamps be USED in too dangerous places, unless absolute need demand iI, and then they should be often changed or, if it be absolutely necessary 10 work in such places, perhaps steel mills might be employed with moresafety. Eighthly, every agent of a mine should be a man of judgment, sober, and cautions. It has beell kllown that some men tiave been put in charge of men's lives, &CY when they have been very unfit; but for some sinister motive, they have been put there, aur!the men H IVE often felt a reluctance lo speak out against them; but every man should labour to put an end to such proceedings speedily. These, Sir, form the chief sources of danger to a mine igniting there are others, hut then they generally arise out of carelessness, or out of some unforeseen circumstance which cannot be avoided. Every miner should remember it is good to be carefully atrentive to every c!;¡lIgerou8 condition 01 the mine, uot forgetting that his owulifeis precious, and nlany other precious lives depeud 011 his Cdre. I "hall resume this subject and labour to notice the best method of ventilation. I am, Sir, Yours respectfully, THOMPSON. TAFF Vale Iron Works, July 4th, 1837.

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