 | Robert Ellis (F.L.S.) - 1851 - 968 σελίδες
...earth which effloresces. In this respect they are less adapted for general use than the Newcastle coal, but many of them are of excellent quality. Next in order to the coals of the midland counties generally, are those of some parts of North Wales, and many districts in South Wales, which contain... | |
 | Andrew Ure - 1853 - 1034 σελίδες
...earth which effloresces. In this respect they are less adapted for general use than the Newcastle coal, but many of them are of excellent quality. Next in order to the coals of the Midland counties generally are those of some parts of North Wales and many districts in South Wales, which contain a... | |
 | Andrew Ure - 1853 - 1034 σελίδες
...earth which effloresces. In this respect they are less adapted for general use than the Newcastle coal, but many of them are of excellent quality. Next in order to the coals of the Midland counties generally are those of some parts of North Wales and many districts in South Wales, which contain a... | |
 | Andrew Ure - 1854 - 1042 σελίδες
...effloresces. In this respect they are lees adapted for general use than the Newcastle coal, but пышу of them are of excellent quality. Next in order to the coals of the midland counties general!}', are those of some part* of North Wales and many districts in South Wales, which contain... | |
 | Samuel Harries Daddow, Benjamin Bannan - 1866 - 826 σελίδες
...argillaceous earth by the white lines on the edges of the beds, and are, therefore, less adapted to general u* than the Newcastle coals; but many of them are of...however, freely, with but little smoke or residue, and are peculiarly adapted for steam purposes and the manufacture of iron, or where a strong blast... | |
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... quantity, often less than 5 per cent., of ash. The ash is often white. Most of the coals from the inland counties readily show white lines on the edges of the beds, owing to the presence of argillaceous earth which effloresces. In this respect they... 