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Show PERFECT FLANS FOR SERIES OF com 111 TESTS To Record the Force and Speed of Coal Dust Ex- : plosions. PITTSBURG, June 7. Plana have been perfected for a remarkable aeries of mine teeta by experts affiliated with the United States vesting atation of the bureau of mines, located ia tha city. Tha experiment will be made In a mine recently purchased by the government at Bruce ton. Pa. Entries 620 feet in length have been tanneled and a steel observation gallery gal-lery haa baea erected In the mine. A coal tipple aad aa incline have been completed and a concrete lining of the eatriea ia under construction. Within a few days coal dust explosions explo-sions will he made under conditions where tha force of tha explosion can alwaya be controlled. The fore of these explosions and their nature will be closely watched by the experts, while mathematical instruments will reeord the time of travel of the exploaive wave. It ia proposed also to investigate ex ploeibility of coal dust in pore air and to make teate with smaller percentage of "fire damp" in tha air. - Teate for limiting and preventing explosiona will be made, such aa sprinkling by water sprayet by exhaust ateam spraye and by dehn'queseent salts (calcium chloride), also by the use of shale and rock dust la venous wars. |