BulletinU.S. Government Printing Office, 1922 - Mines and mineral resources |
Contents
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Common terms and phrases
20-mesh coal dust 20-mesh dust 40 per cent Air course air current analysis Barrier demolished Bureau of Mines calcium chloride cannon carbon cent coal dust cent gas cent pulverized cent shale dust chloride coal-dust explosions combustion concentrate cross shelves cut-through dust and 50 dust explosions dust zone experimental explosion tests figure fire damp Flame extended flame velocity gases guncotton ignition zone inby inch leaching LiƩvin limestone limestone dust loading main entry manometer Maximum pressure mesh methane mixed dust moisture obtained in test onds oxygen percentage pit shale Pittsburgh coal dust pounds per foot Propagation was obtained pulverized coal pulverized dust pulverized Pittsburgh coal Ratio record rib dust road dust roasting rock dust sampler samples solution Standard propagation test station E 1300 sulphide sulphuric acid Table Taffanel tion troughs ventilating current Volatile wave zinc chloride zinc oxide zinc sulphide