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. 1857 Excerpt: ...and size of the particles of which it is composed. The following results are derived from a series of averages, and will perhaps be valuable as affording a general idea upon this subject: --Cwm Erfin, per 21 cwt. = 76 lbs. of water = 3-2 per cent. Average per 21 cwt. = 72 lbs. of water = 3-0 per cent. 142 ASSAYING. ...
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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. 1857 Excerpt: ...and size of the particles of which it is composed. The following results are derived from a series of averages, and will perhaps be valuable as affording a general idea upon this subject: --Cwm Erfin, per 21 cwt. = 76 lbs. of water = 3-2 per cent. Average per 21 cwt. = 72 lbs. of water = 3-0 per cent. 142 ASSAYING. ASSAY OF IRON ORES. For the assay of iron ores a common wind furnace is required. This, in order that it may have a good draught, should have a chimney at least 30 feet in height. Furnaces for this purpose are often built of such a size that four assays may be made at the same time; by which arrangement not only a better heat is obtained, but the loss of fuel attendant on the alternate heating and cooling of a large mass of masonry is to a great extent avoided. A convenient size for such a furnace is 14 inches square, in the hearth, A, and 2 feet in depth to the surface of the fire-bars. The chimney, B, may be of almost any convenient size, provided it is sufficiently large; but when its area is less than one-third that of the fire-place, the draught cannot generally be depended on. The quantity of air passing through the apparatus is regulated by a damper, c, fixed in the chimney, and placed at a convenient height from the ground. Coke is commonly the fuel employed in such furnaces, and a proper distance for the bars to be placed from each other is in that case f ths of an inch; if, however, a mixture of coke and charcoal be used, the grate should be made a little closer. The above furnace must be accompanied by an assortment of tongs to be employed for various purposes. For the removal of the assays at the close of the operation, very strong tongs are required. These being long in the handles, and provided with stout bent jaws, may be used as so..
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Add this copy of Records of Mining and Metallurgy to cart. $57.00, new condition, Sold by Ria Christie Books rated 5.0 out of 5 stars, ships from Uxbridge, MIDDLESEX, UNITED KINGDOM, published 2023 by Anatiposi Verlag.
Add this copy of Records of Mining and Metallurgy to cart. $58.01, new condition, Sold by Ria Christie Books rated 5.0 out of 5 stars, ships from Uxbridge, MIDDLESEX, UNITED KINGDOM, published 2023 by Anatiposi Verlag.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
Add this copy of Records of Mining and Metallurgy to cart. $65.28, new condition, Sold by Ingram Customer Returns Center rated 5.0 out of 5 stars, ships from NV, USA, published 2023 by Anatiposi Verlag.
Add this copy of Records of Mining and Metallurgy to cart. $79.84, new condition, Sold by Ria Christie Books rated 5.0 out of 5 stars, ships from Uxbridge, MIDDLESEX, UNITED KINGDOM, published 2023 by Anatiposi Verlag.
Add this copy of Records of Mining and Metallurgy to cart. $81.26, new condition, Sold by Ria Christie Books rated 5.0 out of 5 stars, ships from Uxbridge, MIDDLESEX, UNITED KINGDOM, published 2023 by Anatiposi Verlag.
Add this copy of Records of Mining and Metallurgy to cart. $81.38, new condition, Sold by Ingram Customer Returns Center rated 5.0 out of 5 stars, ships from NV, USA, published 2023 by Anatiposi Verlag.
Add this copy of Records of Mining and Metallurgy to cart. $85.14, new condition, Sold by Books2anywhere rated 5.0 out of 5 stars, ships from Fairford, GLOUCESTERSHIRE, UNITED KINGDOM, published 2023 by Anatiposi Verlag.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
Add this copy of Records of Mining and Metallurgy to cart. $89.03, new condition, Sold by Paperbackshop International rated 2.0 out of 5 stars, ships from Fairford, GLOS, UNITED KINGDOM, published 2023 by Anatiposi Verlag.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
