The Encyclopaedia Britannica: A Dictionary of Arts, Sciences, and General Literature, 25. köideThomas Spencer Baynes Werner Company, 1895 |
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Page 45
... latter having the disad- vantageous property of decrepitating when first heated : Coal is an amorphous substance of variable composition , operties and therefore cannot be as strictly defined as a crystallized or definite mineral can ...
... latter having the disad- vantageous property of decrepitating when first heated : Coal is an amorphous substance of variable composition , operties and therefore cannot be as strictly defined as a crystallized or definite mineral can ...
Page 47
... latter is derived mainly from iron Sulphur in pyrites , which yields sulphate by combustion . An indi- cation of the character of the ash of a coal is afforded by its colour , white ash coals being generally freer from sulphur than ...
... latter is derived mainly from iron Sulphur in pyrites , which yields sulphate by combustion . An indi- cation of the character of the ash of a coal is afforded by its colour , white ash coals being generally freer from sulphur than ...
Page 49
... latter member is marked by a thin limestone band near the top , containing Spirorbis carbonarius , & small marine univalve . The uppermost portion of the coal measures consists of red sandstone so closely resembling that of the Permian ...
... latter member is marked by a thin limestone band near the top , containing Spirorbis carbonarius , & small marine univalve . The uppermost portion of the coal measures consists of red sandstone so closely resembling that of the Permian ...
Page 50
... latter contain 26 seams above 12 inches thick , making a total of about 100 feet of coal , an amount that increases westward to 82 seams and 182 feet . The Lower Pennant series averages from 1100 to 1500 feet between the Taff Vale and ...
... latter contain 26 seams above 12 inches thick , making a total of about 100 feet of coal , an amount that increases westward to 82 seams and 182 feet . The Lower Pennant series averages from 1100 to 1500 feet between the Taff Vale and ...
Page 55
... latter the Carboniferous limestone shale at 1025 feet . The most likely positions for the coal measure trough are con- sidered by Prestwich to be in Essex and Hertfordshire , while Mr Godwin Austen places them in the valley of the ...
... latter the Carboniferous limestone shale at 1025 feet . The most likely positions for the coal measure trough are con- sidered by Prestwich to be in Essex and Hertfordshire , while Mr Godwin Austen places them in the valley of the ...
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