Chapter II: Practical Operations and Details

18. Tools and Appliances, Description of, 136

GALLERIES AND SHAFTS.

19. Dimensions of Galleries and Shafts, 138

20, 21. Shaft and Gallery Linings, 139

22. Shaft and Gallery Frames, 140

23. Dimensions of Pieces of Frames, etc., 141

24. Relative Advantages of Cases and Frames, 141

25-28. Sinking Shaft by Frames and Sheeting, 141

29. Precautions Needed, 144

30. Partly-lined Shafts, 145

31. Driving a Gallery with Frames and Sheeting, 145

32. Use of False Frame, 146

33. Use of Shield, 147

34. Inclined Galleries, 147

35. Position of Frames, 148

36. Partly-lined Galleries, 148

37-39. Change of Direction of Galleries with Frames
and Sheeting, 148

38. Change of Slope, of Galleries, 149

40, 41. Returns, 150

42, 43. Maps and Drawings, 151

44, 45. Sinking a Shaft with Cases, 152

46-48. Driving a Gallery with Cases, 153

49. Change of Direction of Galley Lined with Cases, 154

50, 51. Change of Slope, 7 Galleries Lined with Cases, 155

52. Shafts à la Boule, 156

53-55. Blinded Galleries, 156

56. Rate of Advance of Galleries, 157

VENTILATION OF MINES.

57. Sources of Deleterious Gases, 158

58. Ventilation by Forcing in Air, 159

59. " by Exhausting Air,159

60. " by Assisting Natural Ventilation, 160

61. " by Use of Masks, etc.,160

MINE-CHAMBERS.

62. Form, Size, and Location of Chambers, 160

LOADING AND FIRING MINES.

63. Preparing the Charge, 161

64. Distribution of Fuses in Charge, 161

65. Character and Construction of Fuses, 163

66-68. Electric Fuses, 163

69. Placing the Fuses in the Charge, 164

70. The Fuzes in Frozen Dynamite, 165

71. Placing the Charge, 165

72. Tamping Mines, 166

73. Firing Mines, 166

CAMOUFLETS BY BORING.

74. In Favorable Soil, 167

75. In Stony Soil, 168