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Página 250
Oil can be extracted not only from the better class of coals , but also from low - grade coals , slack , and shales ... By the scientific treatment of all coal before being used for fuel purposes we could produce from it enough oil and ...
Oil can be extracted not only from the better class of coals , but also from low - grade coals , slack , and shales ... By the scientific treatment of all coal before being used for fuel purposes we could produce from it enough oil and ...
Página 254
bituminous coal would give such good results as German lignite . Nevertheless , it should not be overlooked that Germany has taken a leading place in the application of science to industry , and the process mentioned above should not be ...
bituminous coal would give such good results as German lignite . Nevertheless , it should not be overlooked that Germany has taken a leading place in the application of science to industry , and the process mentioned above should not be ...
Página 256
Prospectuses for new companies for the extraction of oil from coal , or for the manufacture of smokeless fuel , appear frequently in the press , and it may now be said with confidence that the experimental period is passed and the ...
Prospectuses for new companies for the extraction of oil from coal , or for the manufacture of smokeless fuel , appear frequently in the press , and it may now be said with confidence that the experimental period is passed and the ...
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