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7. Equipment in a Coal Laboratory

Hewittic Rectifier changes AC to DC current.

8. Hewittic Rectifier at Jamison Coal Mine No. 9 Laboratory

Hewittic Rectifier changes AC to DC current.

9. Hewittic Rectifier at Jamison Coal Mine No. 9 Laboratory

10. Coal Lab Equipment at the Arkwright Laboratory

11. Coal Lab Equipment at the Arkwright Laboratory

12. Oven in a Coal Analysis Lab, Probably Arkwright Laboratory