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009752

Mine survey in progress. When this was done, rails were lifted and as much metal as possible was removed so as to minimise any influence on the compass. From 'Underground Life; or, Mines and Miners' by Louis Simonin (London, 1869). Wood engraving.

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009752.jpg
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Irish Photo Archive
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3054x2042 / 1.5MB
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Mine survey in progress.   When this was done, rails were lifted and as much metal as possible was removed so as to minimise any influence on the compass. From  'Underground Life; or, Mines and Miners' by Louis Simonin (London, 1869). Wood engraving.