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Mine Gases and Ventilation; A Reference Handbook Combining Theory and Practice of Coal Mining, Designed to Meet the Needs of All Students of Mining, Including Mining Engineers, Mine Managers, Superintendents, Foremen, Assistant Foremen, Firebosses, Shotfi (Paperback) Loot Price: R397
Discovery Miles 3 970
Mine Gases and Ventilation; A Reference Handbook Combining Theory and Practice of Coal Mining, Designed to Meet the Needs of...
Mine Gases and Ventilation; A Reference Handbook Combining Theory and Practice of Coal Mining, Designed to Meet the Needs of...

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Mine Gases and Ventilation; A Reference Handbook Combining Theory and Practice of Coal Mining, Designed to Meet the Needs of All Students of Mining, Including Mining Engineers, Mine Managers, Superintendents, Foremen, Assistant Foremen, Firebosses, Shotfi (Paperback)

James Thom Beard

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Loot Price R397 Discovery Miles 3 970

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 Excerpt: ...Slope Mines and Dip Workings--The same condition in respect to the natural heat of the mine producing or modifying the circulation of the air, holds in all slope mines and dip workings, the same as in shafts and drifts. Whenever the mine temperature is much below or above that of the outside atmosphere, the difference in temperature makes the return air heavier or lighter than the intake air; and the difference in weight of these two air columns destroys the equilibrium of the mine air and creates a current in the airways throughout the mine. A considerable difference of temperature is often observed between the dip and rise air currents in particular sections of a mine. It is this difference in the temperatures of the intake and return currents that often makes dip workings harder to ventilate in summer than in winter. For the same reason, rise workings are frequently found to be more easily ventilated in the summer season. Air Columns--The term "air column," like water column, always refers to a vertical column. The air column, in ventilation, is an imaginary vertical column of air, of unit section (commonly, 1 sq.ft.) and of such height that its weight, in pounds, is equal to the pressure it measures (ib. per sq.ft.). The density of the air (wt. per cu.ft.) is either stated or understood, so that when the height of air column is given the pressure it indicates is readily calculated., In mining practice, it is common to express ventilating l pressure in feet of air column or, as we say, "head of air." Calling the weight of 1 cu.ft. of air w (lb.) and the head of air column h (ff), the rressuie p (ib. per sq.ft.) is calculated by the formula p = w h Or the air column corresponding to any given pressure is found by transposing this formu...

General

Imprint: Rarebooksclub.com
Country of origin: United States
Release date: May 2012
First published: May 2012
Authors: James Thom Beard
Dimensions: 246 x 189 x 4mm (L x W x T)
Format: Paperback - Trade
Pages: 76
ISBN-13: 978-1-235-86955-6
Barcode: 9781235869556
Categories: Books
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LSN: 1-235-86955-5

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