Bulletin . B. EXPERIMENT 58 AT ALTOFTS GALLERY, SHOWING STONE DUST AND SMOKE ISSUINGFROM GALLERY AS THE RESULT OF AN EXPLOSION OF THE 275-FOOT COAL-DUSTZONE. The flame penetrated only 54 feet into a stone-dust zone of 100 feet, therefore not igniting another zoneof coal dust at the outer end of the gallery. (From Colliery Guardian.). C. EXPERIMENT 99 AT ALTOFTS GALLERY, SHOWING FLAME AND SMOKE ISSUING TO ADISTANCE OF 160 FEET FROM EXPLOSION OF 375 FEET OF COAL-DUST ZONE. Flame shows white in the view. (From Colliery Guardian.) REMEDIES JOB GOAL W78T. pressures rose with the distances traveled.
Bulletin . B. EXPERIMENT 58 AT ALTOFTS GALLERY, SHOWING STONE DUST AND SMOKE ISSUINGFROM GALLERY AS THE RESULT OF AN EXPLOSION OF THE 275-FOOT COAL-DUSTZONE. The flame penetrated only 54 feet into a stone-dust zone of 100 feet, therefore not igniting another zoneof coal dust at the outer end of the gallery. (From Colliery Guardian.). C. EXPERIMENT 99 AT ALTOFTS GALLERY, SHOWING FLAME AND SMOKE ISSUING TO ADISTANCE OF 160 FEET FROM EXPLOSION OF 375 FEET OF COAL-DUST ZONE. Flame shows white in the view. (From Colliery Guardian.) REMEDIES JOB GOAL W78T. pressures rose with the distances traveled. The maximum distancetried was375feei from flu* point of ignition. A i 125 feel from the point of ignition the pressure usually developedwas about 35 pounds per square inch. In certain experiments thedevelopment of pressure was very rapid; thi notably true in experiments 55 and 62. In the latter 11m* investigators stat<change impressure of 40 to 90 pounds must have occurred in a dis-tance of 20 feet; the distance was figured from the velocity deter-minations and the time interval, namely, j,1,,, of a second, as shown On 1 he pressure curves. When stone dust was wsvd the pressures showed a drop in pro-portion to the rapidity with which the explosion was extinguished by l lie stone dust. No observations on the speed of propa
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
