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Appendix C.
Report Of Tests On Henry Eden's Lamp No. 286, Made At The Home Office Experimental Station, Eskmeals, On October 5th, 1919.
The first series of tests was made with a still atmosphere containing different proportions of inflammable gas.
The inflammable gas used was coal gas (a "straight" coal gas, i.e., unmixed with water gas, made at the Experimental Station).
The percentages given below represent the equivalents in firedamp of the coal gas used.
I. Weak Mixture. — Equivalent to 8 per cent. methane. The lamp was raised into the mixture, and quickly lowered as soon as the flame began to tail into the gauze, the object being to obtain a weak explosion within the lamp.
The lamp was now allowed to remain in the mixture during 2 minutes (the wick-flame was extinguished, but the gas continued to burn within the gauze). At the end of this time the lamp was rapidly raised and lowered within the chamber about 30 times, being banged against the top of the chamber each time (to see whether the flame could be jerked through the gauze). The flame within the lamp was finally extinguished at the end of 4½ minutes, by lowering the lamp into the air.
A copy of this report was kindly donated by
West Cumbria Mines Research.
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