Seminar, Temas53-64R. Thapar, 1964 |
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Página 11
... coal per day of calorific value 3,500 , he produced 400 times the energy that he actually consumed . Even if this coal was transformed into steam in an engine of one per cent efficiency , it produced energy equivalent to over 20 times ...
... coal per day of calorific value 3,500 , he produced 400 times the energy that he actually consumed . Even if this coal was transformed into steam in an engine of one per cent efficiency , it produced energy equivalent to over 20 times ...
Página 21
... coal taken out is replaced by sand to permit the full thickness to be recovered without letting the roof cave in . Mining has so far been done principally by the board and pillar method leaving the roof supported by pillars of coal ...
... coal taken out is replaced by sand to permit the full thickness to be recovered without letting the roof cave in . Mining has so far been done principally by the board and pillar method leaving the roof supported by pillars of coal ...
Página 45
... Coal Agarwala , B. P. Coal production and transport ( India ) . ' Chartered Accountant ' 11 ( 4 ) : October 62 : p . 126-128 . Agarwala , B. P. Supply and movement of coal . ' Indian Finance , Indian Coal Industry Number ' : 1961 : p ...
... Coal Agarwala , B. P. Coal production and transport ( India ) . ' Chartered Accountant ' 11 ( 4 ) : October 62 : p . 126-128 . Agarwala , B. P. Supply and movement of coal . ' Indian Finance , Indian Coal Industry Number ' : 1961 : p ...
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