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Blasting -- Technique<br />Coal mines and mining -- Testing. -- Illinois -- Centralia<br />Coal mines and mining -- Testing. -- Illinois -- Zeigler<br />Coal mines and mining
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The Use Of Carbon Dioxide For Dislodging Coal In Mines, Durward Rice Schooler
The Use Of Carbon Dioxide For Dislodging Coal In Mines, Durward Rice Schooler
Professional Degree Theses
"The coal mining industry prior to 1940, was undoubtedly facing a period when operating economies and efficient utilization of labor, machines and modern practices were more necessary than ever before. With its markets definitely threatened by other sources of heat and power produced with a minimum of labor, "Coal" had to exert every effort to secure the lowest possible production cost and also to produce a more satisfactory product with greater safety to men and mines...Many attempts have been, with various methods, to invent a method of breaking down coal that would fulfill the requirements stated above. In 1924 or …