Show TO 0 PROTECT rim 0 E L 4 ni COAL C 0 A L MINER stiff I 1 N E R S the government will establish a station to bein gio experiments in gas and coal dust explosions in mines 42 I 1 in order dider to protect miners from gas and coal buat explosions the government is is going to begin experiments probably pio bably at pittsburg pa A station is to be estall 61 aed con mating of an explosive gallery rescue room observation room lamp tc test 4 ing rooms and explosives laboratory the gallery is to be made of boiler P plate late and will be in the form of a cylinder 6 one he hundred feet long and six feet in di diameter arneter A series of safety valves on hinges will b ar ranged along the top 1 P to allow iho escape of gas bolow following 1 i ig an explosion portholes along the sides covered with half inch parte glass will allow those li fn the observation house to see aft whether an explosion hae lias taken placer place k 1 li galler galleri during the teats 0 the cylinder will bo filled filed with firedamp and air or coal dual dust and air and the explosives will be hurled into the gallery by means of a steel mortar fired by electricity flom an observation house sixty feet away the maxi maximum num quantity 1 iZ l each explosive that can ean safely be used in mines will be published under the head of permissible explosives A pressure gauge will be used for measuring tho the actual pre pressure asure in pounds per square inch developed by the detonation of various various explosives tho the an analysis ulysis of the products of combustion will also be made the heat of decomposition of all explosives in terms of calories calori cs will be ascertained by detonating large quin titus in a bomb the explosives will be fired from the mortar at night and the length of the flame fame will be determined mined by photography the time of the flame will also be determined by an electrical apparatus the rescue roon will resemble the interior of a mine and during teats will be filled with smoke the efficiency of all apparatus for sustaining life will be deter determined mired by a series of tests miners will be shown how to rescue their felloe miners the experiment i will be ba under the direction of ot joseph A halmai Hol mei chief of the technologic logic branch of fegeo logical survey |