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25. Coal Lab Equipment at the Arkwright Laboratory

26. Interior of a Coal Lab, Probably Arkwright Laboratory.

27. Coal Lab Equipment at the Arkwright Laboratory

28. On the Phone at the Arkwright Laboratory

29. Pocahontas Coal Company Laboratory Technician at Work

30. Technician at Work in the Pocahontas Coal Laboratory

31. Coal Lab Technician at Work at the Arkwright Laboratory

Four men working in the Pocahontas Fuel Company laboratory.

32. Pocahontas Fuel Company Laboratory

33. Coal Analysis Lab Equipment

34. Coal Analysis Lab Equipment

35. Coal Analysis Lab Equipment

Man standing in a lab with lots of machinery. 'U.S. Bureau of Mines Photo Proof Print.'

36. Mine Machinery