o. Durham, England, on 16 February 1909. It was caused by too much methane gas in the air which caused a single lamp to explode (this was never proven at the ... 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). 16
spekt.jpg?direct&160|}}
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 Bimetalko