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. 1871 edition. Excerpt: ...facilitate the escape of hydrogen. Smee's Battery.--Fig. 31. It was upon the foregoing principle that Mr. Smee constructed his Fig-31 admirable and simple battery. He substituted silver for copper, and roughened the surface of the silver by depositing upon it, through the agency of electricity, platinum in a ...
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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. 1871 edition. Excerpt: ...facilitate the escape of hydrogen. Smee's Battery.--Fig. 31. It was upon the foregoing principle that Mr. Smee constructed his Fig-31 admirable and simple battery. He substituted silver for copper, and roughened the surface of the silver by depositing upon it, through the agency of electricity, platinum in a very finely divided state. It is therefore called platinized silver. From the innumerable points thus presented the hydrogen escapes with a rapid and powerful effervescence, thereby setting the oxygen more at liberty to combine with the zinc. It is usual with the Smee's battery to place a zinc plate on each side of the silver one, for since electricity is developed on the opposed surfaces, there is no reason why both surfaces of a plate, especially if it be an expensive one, should not be put in requisition. Instead of silver the coke scales found in gas retorts may be used with advantage. They are rubbed down into plates and platinized. It has been found that coating the surface of the zinc with quicksilver prevents the acid from attacking and dissolving it when the circuit is not completed, an action formerly very detrimental to the production of electricity. The Smee's battery, therefore, is the most perfect and powerful arrangement, based on the principle of liberating gaseous hydrogen. Chemical reactions in Smee's battery: --(i) H20 + Zn = ZnO + H2 free. (2) S03 + ZnO = ZnSO The first result is the decomposition of the water, giving free hydrogen gas and zincic oxide. The second is the zincic sulphate, which will crystallize out in a short time. Hare's Calorimeter.--Dr. Hare, of Philadelphia discovered that the most intense effect was produced at the moment when a pair of zinc and copper plates were immersed in the acid, and he therefore...
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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.