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Page 367
M ANY thoughtless persons still speak of coal when they mean everything which is loaded upon a pit car in a coal mine . That might have served the purpose once , but it is old - fashioned now . We know that that which we call coal is ...
M ANY thoughtless persons still speak of coal when they mean everything which is loaded upon a pit car in a coal mine . That might have served the purpose once , but it is old - fashioned now . We know that that which we call coal is ...
Page 368
This method cleans the coal , but has its drawbacks . It will extract slate , bone and fire clay to the amount often of twelve or fourteen per cent , but puts in water or moisture to the extent of seven or eight per cent .
This method cleans the coal , but has its drawbacks . It will extract slate , bone and fire clay to the amount often of twelve or fourteen per cent , but puts in water or moisture to the extent of seven or eight per cent .
Page 595
The coal picked up by this dredge is deposited in steel buckets which are car- ried on other flat - bottomed scows . When the harvest of coal has filled all the barges of the fleet , they are towed to points on the shore where regular ...
The coal picked up by this dredge is deposited in steel buckets which are car- ried on other flat - bottomed scows . When the harvest of coal has filled all the barges of the fleet , they are towed to points on the shore where regular ...
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