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. 1873 edition. Excerpt: ...to blow the town into ruins if exploded underneath it. To render this gas actually explosive,1 it must be mixed with at least four times its volume of atmospheric air. When mixed with less than four times, or more than sixteen times its volume of air, it will not explode. Shut out the air from it ...
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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. 1873 edition. Excerpt: ...to blow the town into ruins if exploded underneath it. To render this gas actually explosive,1 it must be mixed with at least four times its volume of atmospheric air. When mixed with less than four times, or more than sixteen times its volume of air, it will not explode. Shut out the air from it altogether and it is harmless, give it a little air and it becomes dangerous, a little more and it is more dangerous, and with still more air it becomes highly explosive, until a large addition of air deprives it of all its devastating power. Hence a gaseous pit but slightly ventilated is thereby brought into the very condition of explosiveness, and the only effectual way of dealing with it is to dilute the gas with an abundant influx of pure air. Let it be mingled with common air to twenty or thirty times its own volume, and then it may be led like an enfeebled and fettered enemy along the mazy airways of the pit, and finally be dismissed to the clouds above. To do this is the aim of Ventilation, a word which, while it suggests but a simple process to the casual reader, calls up before the view of a mining engineer a series of extended and carefully devised arrangements which, at least in the North of England, have attained to a complex and highly artificial system. The principle of the arrangement for ventilating a coal-pit is that of two distinct shafts, a downcast and an upcast. At the base of the latter a huge fire of coals is kindled, and the effective ventilation is measurable by the difference of the weight of the two columns of air in the two shafts. The lighter the column in the upcast, or the greater the rarefaction, the better is the ventilation. Yet there is a practical limit to its amount, which has been much discussed amongst pit...
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Add this copy of On Coal at Home and Abroad, 3 Articles Contrib to the to cart. $19.73, new condition, Sold by Paperbackshop rated 4.0 out of 5 stars, ships from Bensenville, IL, UNITED STATES, published 2019 by HardPress Publishing.
Add this copy of On Coal at Home and Abroad, 3 Articles Contrib. to the to cart. $31.35, new condition, Sold by Booksplease rated 3.0 out of 5 stars, ships from Southport, MERSEYSIDE, UNITED KINGDOM, published 2019 by Hardpress Publishing.
