y three Naylor lamps still approved for Officials use underground after the 1911 Mines & Quarries act wipe out of thousands of lamps deemed unfit for use (Photos Andy Jones)
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A Spiralarm „TYPE M“ was used for detecting explosive gas in the mine. The „TYPE S“ used in sewers.
In der Lampe befand sich ein Bimetalk
were recovered, it was discovered that a lamp was used in the pit that should not be used in gassy pits and that could ignite gas in the surrounding area).