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. 1858 edition. Excerpt: ...and devoid of crystalline structure. The alkaline silicates, when in a state of fusion, have the power of dissolving a large quantity of silica. There are two principal varieties of glass. The first comprises crown and plate glass, and is composed principally of silica, potass, and lime; the second, ...
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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. 1858 edition. Excerpt: ...and devoid of crystalline structure. The alkaline silicates, when in a state of fusion, have the power of dissolving a large quantity of silica. There are two principal varieties of glass. The first comprises crown and plate glass, and is composed principally of silica, potass, and lime; the second, called flint glass, contains, in addition, silicate of lead; the lead promoting fusibility, and increasing the density, lustre, and refractive power. The principle of the glass manufacture is very simple. Silica, in the shape of fine sand, is heated with carbonate of potass or soda, and slaked lime, or oxide of lead. At a high temperature, fusion and combination occur, and carbonic acid is expelled. When the melted mass has become clear and free from air bubbles, it is left to cool slowly until it assumes the peculiar tenacious condition suitable for working. Crown and plate glass have a greenish colour; flint glass is colourless, and has a higher refractive index. Plate glass is cast upon a flat metal table, rolled, and, after very careful annealing, ground true and polished by machinery. (See " Plate Glass.") The large circular tables of crown glass are made by the glass blower. A long iron tube, called the blow-pipe, with a wooden mouthpiece, has its end dipped into the tenacious, soft, semi-fused glass in the glass pot. The lump of glass thus removed is then blown into a flask. An iron rod, called a pontil, is then dipped into the glass pot, and applied to the bottom of the flask so as to form a handle to it. The blow-pipe is then detached from the neck of the flask, which is again heated in the furnace, and then suddenly turned with great rapidity, so that the centrifugal force causes it to assume the shape of a flat disc. This done it is...
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Add this copy of A Dictionary of Photography to cart. $22.94, new condition, Sold by Books2anywhere rated 5.0 out of 5 stars, ships from Fairford, GLOUCESTERSHIRE, UNITED KINGDOM, published 2020 by HardPress Publishing.
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Add this copy of Dictionary of Photography to cart. $61.78, new condition, Sold by Books2anywhere rated 5.0 out of 5 stars, ships from Fairford, GLOUCESTERSHIRE, UNITED KINGDOM, published 2021 by Bod Third Party Titles.
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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.
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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.
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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 A Dictionary of Photography to cart. $28.39, new condition, Sold by Booksplease rated 4.0 out of 5 stars, ships from Southport, MERSEYSIDE, UNITED KINGDOM, published 2018 by HardPress Ltd.
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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 Dictionary of Photography to cart. $63.35, new condition, Sold by Paperbackshop International rated 2.0 out of 5 stars, ships from Fairford, GLOS, UNITED KINGDOM, published 2021 by Bod Third Party Titles.
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