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'A small portion of the hot ash-laden gas stream entering the turbine is continuously removed by this ash-sampling unit. Data from the operation of this unit is analyzed to determine the concentration, size, and composition of the ash in the hot gases entering the turbine.'

1. Sampling Hot Ash-Laden Gas

Coal crushed to 3/16-inch by 0 is pumped to a pulverizer that grinds it to 90-per cent hrough 200-mesh. The product is mixed with air and burned in the combustors. Hot high-speed gas from the ash separators drives the turbine, air compressor, and electric generators. Exhaust from the turbine passes through a regenerator that preheats compressed air to the combustors. If used, please credit Bureau of Mines, U.S. Department of the Interior.

2. Schematic Diagram of Coal-Fired Gas Turbine

This mock-up shows the new blade design being tested by the Bureau of Mines. The base of the blade is thicker and there is a strip of titanium carbide at the point of previous severe erosion. If used, please credit Bureau of Mines, U.S. Department of the Interior.During LDC's final 1,100-hour run, this rotor blade (arrow) was undercut by ash flowing  along the rotor past the tips of the stator blades. If used, please credit Bureau of Mines, U.S. Department of the Interior.

3. New Rotor Blade Design

This mock-up shows the new blade design being tested by the Bureau of Mines. The base of the blade is thicker and there is a strip of titanium carbide at the point of previous severe erosion. If used, please credit Bureau of Mines, U.S. Department of the Interior.During LDC's final 1,100-hour run, this rotor blade (arrow) was undercut by ash flowing  along the rotor past the tips of the stator blades. If used, please credit Bureau of Mines, U.S. Department of the Interior.

4. New Rotor Blade Design

5. Summerlee Hoisting Room, C. B. Lee, Engineer, at the Controller

6. Cutting Coal by Machine

7. Coal Cutting Machine

Miner operates a shuttle car that is loaded with coal.

8. Shuttle Car Being Loaded

Minre watches as coal pours into the shuttle car.

9. Shuttle Car Being Loaded

Mountaineer Coal Company, Division of Consolidation Coal Company.

10. Continuous Mining Machine (Middle) and Loading Machine (Bottom)

11. Shuttle Car Approaches Mine Railway Track.

1-Mining machine, electrically operated, 2. Electric locomotive and coal car train leaving mine, 3. Shaker screen for sorting coal according to size, 4. Coal powerhouse and tipple.

12. Coal Mining, Modern Methods of Production

Rear end of loaded coal car in an underground mine.

13. Shuttle Car Being Loaded by Mechanical Loader

'All ready-Hoist! This is an end view of one of our new steel mine cars on a cage at one of the White Oak Shaft mines, and the signal has just been given to hoist it to the surface--450 feet up! These electric equipped hoists can hoist a car every twenty seconds and dump it! The cars are placed on the cages automatically by creeper chains and car stops. One man operates the signals and car stops and chains.'

14. Steel Mine Car at One of the White Oak Shaft Mines

View of the mechanics of a stove coal washer.

15. Stove Coal Washer, Price Hill Colliery Company

'Coal at all White Oak shafts mines is handled on self dumping cages, which handle the coal uniformly and with a minimum of breakage. Note how evenly the coal is flowing from the mine car. Much more rapid of course than the picture indicates, but it shows how well designed the equipment must be to handle the coal in such splendid manner.'

16. Self Dumping Cages

The heating system is used for lamphouse, bathhouse, shop and warehouse.

17. Ireland Mine Shamrock Portal Automatic Coal-Fired Heating System

View of a row of boilers and equipment in an underground mine.

18. Boilers in a Coal Mine

Miner watches as coal loads into a shuttle car.

19. Shuttle Car Being Loaded

Technician views equipment in a mine lab.

20. Coal Mine Lab

Coal cutting machine digs into the coal seam.

21. Coal Cutting Machine

22. Jeffrey Loading Machine Emptying Coal into a New 11-Ton Steel Mine Car at Mine No. 32

23. Loading Coal in an Unidentified MIne

Miner watches as coal loads into a shuttle car.

24. Shuttle Car Being Loaded

Two miners use equipment to secure the roof at the Pursglove No. 15 mine.

25. Miners Roof Bolting in Pursglove No. 15 Coal Mine

Shuttle car in an underground mine, loaded with coal.

26. Loaded Shuttle Car

'Modified longwall mining with a German coal planer. Progress report 2: Completion of mining in three adjacent panels in the Pocahontas no. 4 coal bed, Helen, W. Va.' Please give credit to the Bureau of Mines, United States, Department of Interior.

27. Interior of a Coal Mine with Roof Supports Along Longwall Face

Pittsburgh Consolidation Coal Company mine.<br />

28. Miner Operating a Joy Cutting Machine

Cutting equipment on a table.

29. Stack Saw at Thomas, W. Va.

30. Drill Press,Thomas, W. Va.

31. Mining Equipment (hammer) at Thomas, W. Va.

32. Mining Machinery, Thomas, W. Va.

33. Hoisting Engine at Thomas, W. Va.

34. Mining Machinery, Thomas, W. Va.

35. Mining Machinery, Thomas, W. Va.

36. Room with Mining Machinery and Equipment, Thomas, W. Va.

Close view of a conveyor and engine.

37. Mining Machinery, Thomas, W. Va.

Close view of an electric motor at a coal mine site in Thomas, W. Va.

38. Electric Motor, Thomas, W. Va.

View of a conveyor and engine at a coal mine operation in Thomas, W. Va.

39. Mining Machinery, Thomas, W. Va.

40. Mat Conveyor Built in the Shop at Thomas, W. Va.

41. Mining Machinery, Thomas, W. Va.

42. Mining Machinery, Thomas, W. Va.

Close view of a conveyor and engine at a coal mine operation in Thomas, W. Va.

43. Mining Machinery, Thomas, W. Va.

Close view of a conveyor and engine at a coal mine machine shop in Thomas, W. Va.

44. Mining Machinery, Thomas, W. Va.

View of a conveyor in a machine shop at a coal mine in Thomas, W. Va.

45. Mining Machinery, Thomas, W. Va.

46. Mining Machinery, Thomas, W. Va.

Close view of a conveyor at a coal mine shop in Thomas, W. Va.

47. Mining Machinery, Thomas, W. Va.

48. Coal on Conveyor Belt at Jamison No. 9 Mine