Washington Education Journal: The Voice of Education in Washington, Volume 29Washington Education Association, 1950 |
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... COAL MINE " PRESCRIPTION " COUNTER Many of today's coal buyers " write their own prescriptions . " In buying coal they specify not only the grade and size , but car- bon , volatile ash , and sulphur content , and heat value as well ...
... COAL MINE " PRESCRIPTION " COUNTER Many of today's coal buyers " write their own prescriptions . " In buying coal they specify not only the grade and size , but car- bon , volatile ash , and sulphur content , and heat value as well ...
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... coal mine ? In this coal mining operation nobody goes underground to mine coal ; instead , the 75 - foot earth - cover is simply scooped aside by giant shovels and the coal uncovered to the sky ! Called surface mining , this method ...
... coal mine ? In this coal mining operation nobody goes underground to mine coal ; instead , the 75 - foot earth - cover is simply scooped aside by giant shovels and the coal uncovered to the sky ! Called surface mining , this method ...
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... coal preparation plants " float off " the more buoyant coal , thus separat- ing it from rock or other foreign matter . The man above is supervising the agitator mech- anism of a coal " laundry . " " Gently " is the word in loading coal ...
... coal preparation plants " float off " the more buoyant coal , thus separat- ing it from rock or other foreign matter . The man above is supervising the agitator mech- anism of a coal " laundry . " " Gently " is the word in loading coal ...
Outras edições - Ver tudo
Washington Education Journal: The Voice of Education in Washington, Volume 26 Visualização de excertos - 1947 |
Washington Education Journal: The Voice of Education in ..., Volumes 18-19 Visualização de excertos - 1939 |
Washington Education Journal: The Voice of Education in ..., Volumes 20-21 Visualização de excertos - 1941 |
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