Transactions - North of England Institute of Mining and Mechanical Engineers Volume 2

Transactions - North of England Institute of Mining and Mechanical Engineers Volume 2

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1854 edition. Excerpt: ...the demand having increased a hundredfold, and being likely to continue while cheap iron ore can be got. Household coal is described generally as bright and cubical; it preserves its form in regular blocks after the small is taken from it. As an instance of this, it may be stated that one block was hewn at Blackboy Colliery, for the purpose of being sent to the Middlesbro' drops on the day of opening them, in 1831, and from thence to the Coal Exchange in London, weighing no less than 3J tons. This was the largest block ever received by shipment from the Northern Coal Field. This coal burns to a black cinder, which in turn is consumed, so that only a small portion of ashes remain. Its freedom from sulphuret of iron render it admirably adapted for the purpose to which it is applied. The best coals for household purposes, after being drawn to the pit mouth, are passed into waggons, in most cases, over a five-eight of an inch screen, and the "duff" is that which falls through another screen, the latter leaving, of course, nothing but very small; only a very small portion of this coal is turned to refuse at the present time, for the dirt is sifted out of the duff; in some cases it is washed out by a machine invented for the purpose. The best portions of the duff are used for manufacturing purposes, in places where there is a demand for it. This was not the case formerly, for nuts and duff were thrown aside and accumulated near the pit mouth, where storage ground was required to be provided. Hundreds of thousands of tons of these coals were annually destroyed as waste by burning. This was, in fact, at that time the most economical mode the proprietors had of disposing of them, for they could not be sold at a price to cover rent and...
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Product details

  • Paperback | 110 pages
  • 189 x 246 x 6mm | 213g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236567404
  • 9781236567406