Bulletin . J inch. air wrere the same; the discharge air with spray arrived at the endof the pipe at a temperature of 73° compared to 84° without rock temperature of the place at the discharge end of the pipewas 87° F. Figure 26, on the other hand, shows that practically saturated airwith high velocity and high temperature actually lost temperaturein flowing through canvas pipe. Air at 82° dry-bulb temperature, 44 UNDERGROUND VENTILATION AT BUTTE. 98 per cent relative humidity, was forced from the top of a manwajthrough 2,200 linear feet of 16-inch canvas tubing in a crosscut ata vel
Bulletin . J inch. air wrere the same; the discharge air with spray arrived at the endof the pipe at a temperature of 73° compared to 84° without rock temperature of the place at the discharge end of the pipewas 87° F. Figure 26, on the other hand, shows that practically saturated airwith high velocity and high temperature actually lost temperaturein flowing through canvas pipe. Air at 82° dry-bulb temperature, 44 UNDERGROUND VENTILATION AT BUTTE. 98 per cent relative humidity, was forced from the top of a manwajthrough 2,200 linear feet of 16-inch canvas tubing in a crosscut ata velocity of 4,200 linear feet per minute at the point of dischargethe air leaving the pipe at 79|° F. and 100 per cent relative humidity!The flowing air deposited so much water in the pipe that drainagehad to be provided. The probable reason for the decrease in airtemperature, instead of the usual increase of 1° F. or over per 100 feetof pipe, is that the rock temperature in the crosscut was 72J° F. and. Length of canvas pipe, feet. FI^b^^ LTi8?d h,u?idit/ ,of air by flow through 16-iuch «™ of canvas n7,tJf70- *elalive h™l(llt* I *> dry bulb ; Q) wet bulb ; d, discharge endfromS?2l«J } / Wet 3,nd, dlT bulb> 10° per cent rclativo humidity ;e waterper cenrhumMity • VkH 2?St-* °f T*% ** 78° F Wet and £ W**52^00 foot lvel lt81- V wet bulb t- £ drTbulh^ £ ** °f 2% ^ air fl°moriginal rock temnonrmJ701 ° J-? J bb 98 per cent relative humidity; 5,500 cu ft • decrease to ion ft J • ??n at discha^e end of pipe, volume o1.,o TV: aecr°ase to 100 ft. of pipe, wet-bulb temperature, 009° F ? drv F.; increase of relative humidity, per cent to 100 ft. of pipe. water drippers, temperature 72 to 75°, fell on the pipe continuouslyat many points. J There can be no doubt as to the generation of heat in a rapid aircurrent through frictional resistance, yet the exact increase for shafts,drifts, or crosscuts can not be separated from the increase throughr
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
