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Arrangement for nichecharge experiment in shear face
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0.5-pound charge 12 inches 20 trials 5,000 milliseconds table 5,500 milliseconds 6-inch kerf 840 milliseconds 98-percent confidence level 99-percent confidence black powder Bureau of Mines cartridge charge of explosive charge of permissible charge was ejected charge weight coal burden coal dust coal face conditional probability confidence level cutoff charge CUTOFF EXPLOSIVE CHARGES decrease in ignition delay interval ranged Density-1 detonator Directors of Safety distance of separation Dust Explosions estimated burden Experimental Coal explosive H factor is significant file-loaded fired in coal firedamp firing delay interval Fripiat gas ignition gas-air mixture HAZARDS OF CUTOFF igni ignition fre ignition of gas ignitions occurred initiated by influence Initiation of Explosive John Nagy linear distance lines loaded nonpermissible dynamite nonpermissible explosive opposing mine rib opposing mine surface permissible explosive pounds quenching second charge Shearcut face sheared face Short-Delay Blasting Single Blown-Through Shot single charge suspended charge tests Undercut Face