Mine-ventilation Stoppings, with Especial Reference to Coal Mines in Illinois, by R. Y. Williams... PDF Download
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Author: Robert Young Williams
Publisher:
ISBN:
Category :
Languages : en
Pages : 30
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Author: Robert Young Williams
Publisher:
ISBN:
Category :
Languages : en
Pages : 30
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Book Description
Author: United States. Bureau of Mines
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Robert Young Williams
Publisher:
ISBN:
Category : Mine ventilation
Languages : en
Pages : 46
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Author: Robert Young Williams
Publisher:
ISBN:
Category : Mine ventilation
Languages : en
Pages : 0
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Author: Robert Young Williams
Publisher:
ISBN:
Category : Mine ventilation
Languages : en
Pages : 30
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Author: R. Y. Williams
Publisher: Forgotten Books
ISBN: 9780484629485
Category : Technology & Engineering
Languages : en
Pages : 42
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Excerpt from Mine-Ventilation Stoppings: With Especial Reference to Coal Mines in Illinois The foregoing discussion of renewals deals with the depreciation of stoppings through normal mining conditions. There are, however, extraordinary agencies that destroy stoppings, some of these agencies partly or wholly wrecking certain types of stoppings and yet in no Way injuring other types. Such agencies are: Fires, windy shots, blown-out shots, explosions, local roof falls, general mine squeezes, and water. In order to obtain the annual expense for emergency repairs on the different kinds of mine stoppings, information was obtained from coal operators regarding the number of stoppings and the cost of repairs each year because of these extraordinary agencies. The quotient obtained by dividing the total cost by the number of stop pings ih use at the particular mine was charged to each stopping as the a1mual cost of emergency repairs. For example, at one mine the records showed that 18 stoppings were destroyed by windy or blown out shots; the cost of each repair averaged the total cost was and, as stoppings were in use, the expense to be dis tributed over each stopping was 12 cents per annum. A compilation of the information obtained on the annual expense required for emergency repairs is given in Table 7 following. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: Robert Young Williams
Publisher:
ISBN:
Category :
Languages : en
Pages : 69
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Book Description
Author: United States. Bureau of Mines
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Robert Young Williams
Publisher:
ISBN:
Category : Coal mines and mining
Languages : en
Pages : 69
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Author: United States. Bureau of Mines
Publisher:
ISBN:
Category : Mines and mineral resources
Languages : en
Pages : 1134
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