The Encyclopaedia Britannica: A Dictionary of Arts, Sciences, and General Literature, 6. köideThomas Spencer Baynes C. Scribner's Sons, 1878 |
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Page 45
... latter being much tougher than the black coal . Some lignites are , however , quite as brilliant as anthracite ; cannel and jet may be turned in the lathe , and are suscep- tible of taking a brilliant polish . The specific gravity is ...
... latter being much tougher than the black coal . Some lignites are , however , quite as brilliant as anthracite ; cannel and jet may be turned in the lathe , and are suscep- tible of taking a brilliant polish . The specific gravity is ...
Page 47
... latter is derived mainly from iron lphur 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 those ...
... latter is derived mainly from iron lphur 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 those ...
Page 49
... latter member is marked by a thin limestone band near the top , containing Spirorbis carbonarius , a 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 , a 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 54
... latter , -the strata in the Somersetshire area being sharply bent and broken on a north and south line in a manner which is not seen elsewhere in this country , but is reproduced on a much larger scale in the north of France and Belgium ...
... latter , -the strata in the Somersetshire area being sharply bent and broken on a north and south line in a manner which is not seen elsewhere in this country , but is reproduced on a much larger scale in the north of France and Belgium ...
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