The Encyclopedia Americana: The International Reference Work, Volume 7Americana Corporation, 1960 - Encyclopedias and dictionaries |
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Page 152
... coal is obtained from underground mines . The two principal systems employed in mining underground coal are the room - and - pillar method and the longwall method . In the first method pillars of coal are left to support the roof and ...
... coal is obtained from underground mines . The two principal systems employed in mining underground coal are the room - and - pillar method and the longwall method . In the first method pillars of coal are left to support the roof and ...
Page 158
... coal , about 50 other projects , includ- ing work on new space heaters , improved gas producers from coal , new heat pumps run by coal , and modernized methods for burning all bi- tuminous coal without smoke , are under way . Atomic ...
... coal , about 50 other projects , includ- ing work on new space heaters , improved gas producers from coal , new heat pumps run by coal , and modernized methods for burning all bi- tuminous coal without smoke , are under way . Atomic ...
Page 231
... Coal charging t ? NA 3 ک 2. Coal bin- Coal magazine Retort Coal valve Gas take off Charging hopper Feed indicator Main damper Coke extractor Ladder for sight holes Coke hopper Water seal valve Coke chute States are all of the bituminous ...
... Coal charging t ? NA 3 ک 2. Coal bin- Coal magazine Retort Coal valve Gas take off Charging hopper Feed indicator Main damper Coke extractor Ladder for sight holes Coke hopper Water seal valve Coke chute States are all of the bituminous ...
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