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.HrGH TREVARTHEFS DOUBLE.

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sufficient to fly off the lamp almost unknown to the! owner of it, in search for more supply of combustion, and gaining its force by travel- ling through the workings. Is it not more reasonable to believe that one of these actions could have caused the explosion, and no one to be blamed for it, unless it is for using such a worthless lamp? Another explosion again,may I give my opinion of it ?The practical collier, whenever he sees his lamp explode, jumps at it, to save his light, and once in a chance' he succeeds, for the least jerk to his lamp cuts the current that enters in through the in- dividual passages of the gauze, as they are so small. This fact proves that it is impossible for a person tol carry his lamp in an explosive mixture, long enough to cause an explosion out of it. Besides, a man is not able to stand in an explosive mixture for sufficient time to cause an explosion. If so, what caused the Bryncoch explosion? Is there any reason to believe that the fireman caused the explosion in the way it was told before the jury? Is it not more reasonable to believe that the two lamps were left by father and son, when they found tliemsplves without light, they rushed away without their lamps, as they were of no use to them. notwithstand- ing that they were still burning gas, out of si:vht, -nsil,- the bonnet. This is proved by the fact that their bodies were found, more than a 109 yards from their lamps, after the explosion, and it also shows that they had been •suffocated by the gas previous to the explosion. Another instance is the Park Slip explosion, that could be proved in the same manner. After pointing cut the weak points of the N,nnet,e,'l lamp, or th3 so-called Cambrian, :t is only right that I should be able to bring a better lamp.After nearly twenty years' investi- gation and research, I have now a lamp that has proved itself to be perfectly safe and practi- cal This lamp was experimented on by the most skilful managers and engineers in the Ithondda coal district, and their report proves* that gas could not be burnt in it by any means at the Cymmer Colliery (1889). The result was as follows — Velocity of Air. Remits. — 30 feet p°r second Went out in 4 seconds l> M »i 6 20 „ „ 8 „ 1^ it »» »» »» 10 „ „ „ 3 „ Explosive mixture—Air, 90.5 per cent.; 9.5 per cent. of gas. This proportion was found to be the most explosive. The lamp also complies with the suggestion of the Royal Commissioners, i.e., that the ex- plosion is red out of the lamp, into such a posL tion where the supply has to enter on top of the fire, bringing nf'ter it the products of the wick flame, which was in the body of the lamp, when the gas was ignited, making it im- possible for an action to! come through the lamp to supply it, and its practicability has been proved to satisfaction by more than 500 individuals, to whom I have sold the lamp in cifferent parts of the country, when all the managers refused a single order, and at the same time complimenting me by, saying that it is the best and safest lamp they ever handled, this being the result of representing my fellow-workmen, and causing the experi- mcnts to be repeated, for not being justly car- ried out the first time. I also possess another improvement to the lamp, i.e., a mode of lighting it. The lamp can be re-lighted,wher- Z, ever the man is. if he can lay his hands on it, even after an explosion, if there be sufficient air left. If I could only get an order for 5,000 of them, I should be able to bring it be- for the public. The chief characteristics of a safe and prac- tical miner's lamp are: — 1. There are no small metal passages, as constructed by Sir Humphrey Davey, to ex- tinguish the fire. 2. There should be a glass to produce good light. 3. The explosion should be carried out of the lamp as suggested by the Royal Commission- ers Lt It should hewell-ventilated with the supply of fresh air coming under the wick flame, so as to be able to burn the "seal" or any other low flash oil, and give good light. 5. It should be possible to relight it wherever the lamp should happen to be extinguished, if he can lay his hands on it. 6 It should be examined, and rivetted in a few seconds. My lamp complies with all these requirements. The only one that stops the counter action in the lamp when it comes in contact with gas For mode of ventilation refer to the drawing. The air enters in at No. 1, passes over a deflecting rim at No. 2 down through gauze at No. 3, enters into lamp between glass and tube at No. 4, returns through tube at No. 5, then into chamber No. 6, and out through top. as arrows indicate. When gas comes in with the air current it ignites at the wick flame and relurns for more support of combustion between the glass and tube into chamber No. 3, in which position it must ex- tinguish. as the supply has to come down on top of the fire. The lock is a lead rivet placed in a perpendicular position in a slot in a brass ring which attaches the bonnet to the lamp coming through into one of the air slots in the top glasa ring. Is it right that the collieries should be soc- rificetl for the sake of taking revenge on an individual. Study the question for your own interests. I am prepared to answer any ques- tion that may be asked. T. THOMAS. 36. Ynyshir Road. Ynyshir.

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