 Besides the coal exported to different parts of England, a large quantity is consumed in the two counties, which cannot easily be calculated. About thirty years ago a practice was adopted at the pits, where the coal was of a fragile nature, of erecting...  Transactions of the Geological Society - Página 56por Geological Society of London - 1817Vista completa - Acerca de este libro
 | William Phillips - 1818 - 302 páginas
...parts of England, a large quantity is consumed in the two counties, which cannot easily be calculated. About thirty years ago a practice was adopted at the...These soon take fire from the heat of the decomposing pyrites, and continue to bum for several years.* Not less than 100.000 chaldrons are thus annually... | |
 | William Daniel Conybeare, William Phillips - 1822 - 568 páginas
...parts of England, a large quantity is consumed in the two counties, which cannot easily be calculated. About thirty years ago a practice was adopted at the...These soon take fire from the heat of the decomposing pyrites, and continue to burn for several years.* Not less than 100,000 chaldrons are thus annually... | |
 | William Daniel Conybeare, William Phillips - 1822 - 592 páginas
...of England, • large quantity is consumed in the two counties, which cannot easily be calculated. About thirty years ago a practice was adopted at the...system is now become universal, and immense heaps of coil are thus raised at the mouths of the pits. These soon take fire from the heat of the decomposing... | |
 | British geology - 1850 - 332 páginas
...was adopted, when the coal was of a fragile nature, of erecting screens for separating the smaller from the sounder coal. This system is now become universal ; and immense heaps of refuse small coal are raised at the mouths of the pits. These soon take fire from the heat of the decomposing... | |
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