The Encyclopedia Americana, Volume 7Grolier, 1985 - Encyclopedias and dictionaries |
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Page 133
COAL BUREAU OF MINES AND JOY MANUFACTURING COMPANY CONTENTS Page Section Page Section 1. How Coal Was 3. World Coal Formed 133 Resources 136 Accumulation of 4. Coal Mining and Plant Debris 133 Production Appearance of Kinds of Mines 137 ...
COAL BUREAU OF MINES AND JOY MANUFACTURING COMPANY CONTENTS Page Section Page Section 1. How Coal Was 3. World Coal Formed 133 Resources 136 Accumulation of 4. Coal Mining and Plant Debris 133 Production Appearance of Kinds of Mines 137 ...
Page 137
Only a very small portion of the world's coal stock is anthracite ( hard coal ) , which ranks at the top in the order of coals . The bituminous ( soft ) coals constitute less than half of the world stock . China , the Donets region of ...
Only a very small portion of the world's coal stock is anthracite ( hard coal ) , which ranks at the top in the order of coals . The bituminous ( soft ) coals constitute less than half of the world stock . China , the Donets region of ...
Page 144
UNDERGROUND GASIFICATION OF COAL The United States , Britain , and the Soviet Union have made tests to gasify coal under- ground to obtain a low - Btu gas . In this ap- proach , input- and output - bore holes are drilled down to a coal ...
UNDERGROUND GASIFICATION OF COAL The United States , Britain , and the Soviet Union have made tests to gasify coal under- ground to obtain a low - Btu gas . In this ap- proach , input- and output - bore holes are drilled down to a coal ...
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