UNITED STATES DEPARTMENT OF THE INTERIOR Fred A. Seaton, Secretary BUREAU OF MINES Marling J. Ankeny, Director For sale by the Superintendent of Documents, U. S. Government Printing Office Washington 25, D. C. - Price 65 cents ILLUSTRATIONS 47. Air-operated ventilation door; side door for foot traffic. 48. Ventilation door mechanically operated by third rail. 49. Ventilation door used on motor haulage in Arizona_. Fig. 1. Fire in Tonopah-Belmont shaft, Tonopah, Nev.. 2. Gases and smoke from Tonopah-Belmont mine fire. 3. Portal and burned buildings, Glenn mine, California_ 4. Bypass to convert air lines to water lines for fire fighting 5. Mobile fire-fighting equipment... 6. Mine fire trucks__ 7. Typical universal gas masks. 8. Composite cross section of various universal gas-mask canisters__. 9. A, Mines Safety Appliances Co. 1-hour (front type) self-contained breathing apparatus; B, McCaa 2-hour self-contained breathing apparatus_ 10. Self-rescuer with hinged-lid container_ 11. Self-rescuer in plastic bag- 12. Safety-chamber door__ 13. Counterweight closes fire door when compressed-air trip releases catch. 14. Metal fire door on concrete frame at top of raise_ 15. Steel fire and ventilation door in concrete frame_ 16. Rock bulkhead laid with mixed cement and clay- 23. Good housekeeping around a surface plant, Michigan_ 26. Fire-resistant headframe, Michigan.. 27. Details of flame safety lamp 28. Iodine pentoxide (hoolamite) carbon monoxide detector. 29. MSA colorimetric carbon monoxide detector.. 30. Saf-CO-Meter colorimetric carbon monoxide detector.. 10 11 1 31. Pyrotannic acid apparatus for sampling and determining carbon monoxide. 32. Hydrogen sulfide detector_ 33. Portable Orsat apparatus for gas analysis 34. Gas-analysis laboratory, Bureau of Mines, Pittsburgh, Pa.. 35. Ventilation map, iron-ore mine in Michigan_ 36. Byram-type vane anemometers___ 37. Bureau of Mines sling-type psychrometers and carrying cases. 38. Standard type of small aneroid barometer... 39. Water gage.. 40. Propeller-type fan installed on surface 41. Centrifugal-type fan on surface__ 42. Centrifugal-type fan installed underground_ 43. Typical underground fan installation 44. Booster fan installed in a 14-inch metal air line 45. Two-fan reversible unit__. 46. Venturi-type compressed-air injector ! ! ! ! E 50. Sollar and safety gate at top of raise__ 103 51. Sectional gate over raise at sublevel_ 103 52. Ventilating-heating plant in Minnesota_ 106 53. Coils for heating mine intake air. 106 54. Surface water-cooling tower for air conditioning- 108 55. Radiators with cold-water circulation through which hot mine air is forced 109 56. Cold-water sprays on intake airway. 110 |