The Encyclopedia Americana: The International Reference Work, Volume 7Americana Corporation, 1955 - Encyclopedias and dictionaries |
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Page 72
... operation breaking up the clay as pressure increases between roll and housing . The double roll crusher performs the same two operations , tearing and crushing . It is con- structed of two rolls equipped with teeth . The teeth serve to ...
... operation breaking up the clay as pressure increases between roll and housing . The double roll crusher performs the same two operations , tearing and crushing . It is con- structed of two rolls equipped with teeth . The teeth serve to ...
Page 153
... operation of a strip pit is de- termined by the ratio of the thickness of the coal seam to the thickness of the overburden , modified by the corresponding costs of the two operations . While wide variations in the con- trolling factors ...
... operation of a strip pit is de- termined by the ratio of the thickness of the coal seam to the thickness of the overburden , modified by the corresponding costs of the two operations . While wide variations in the con- trolling factors ...
Page 612
... operation . Perfect - Discharge Bucket Elevator . - This uses two strands of chain and has its buckets attached thereto at intervals . It has a pair of idler sprockets on the return side just below the head wheels to deflect the chains ...
... operation . Perfect - Discharge Bucket Elevator . - This uses two strands of chain and has its buckets attached thereto at intervals . It has a pair of idler sprockets on the return side just below the head wheels to deflect the chains ...
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