The machine designed by the Central Engineering Establishment for the continuous driving of rock headings at penetration rates as high as 5 ft/hr will dissipate most of its power as heat and will create large quantities of dust. This report gives theoretical estimates of the magnitude of the heat and dust hazards. It has been based on intake air at dry and wet bulb temperatures of 70° and 60°P respectively, on 500 h.p. of the power of the machine appearing as heat, and it assumes there is no other source of heat such as surrounding hot, deep strata, no free water to raise the wet bulb temperature and no ventilation leakage in the ducts.
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