Ian Pope wrote:
> Electric Lighting was first used underground in the early 1880s at
> Trafalgar Colliery in the Forest of Dean.
>
>
Clement Le Neve Foster reports that, among the first successful application
of electric light to underground excavations was its use in the Angers
slate quarries. Two arc lights fitted into chambers of 2400 square yards
were installed.
Peter Challis
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