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Hydrogen cylinder, spare, for Safety lamp: Gray type

1893-1899

Mahogany box, to carry Safety lamp: Gray Type and Hydrogen cylinder

1893-1899
Safety lamp: Gray type, for coal miners’ gas testing, originally designed by Thomas Gray, design modified by Dr. Frank Clowes, based on J. Ashworth's patent Hepplewhite-Gray type, for gas testing and made by Stanley, Derby, Derbyshire, England, 1893-1899

Safety lamp: Gray type

1893-1899
Safety lamp, Ashworth-Hepplewhite Gray, Gray type, use: gas detecting, maker J. Davis and Son, Derby, marking: makers name, 1888

Safety lamp

1888