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. 1889 Excerpt: ...have been nearly realized. If the exhaustion had been carried at each time to 0-2 inch, the residue by theory would have been only j-th part. But the experimental results will not continue to keep pace with such small magnitudes. Queen-s College, Belfast, January 7, 1851. XXV.--ON THE DISCOVERY OF MINUTE QUANTITIES OF ...
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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. 1889 Excerpt: ...have been nearly realized. If the exhaustion had been carried at each time to 0-2 inch, the residue by theory would have been only j-th part. But the experimental results will not continue to keep pace with such small magnitudes. Queen-s College, Belfast, January 7, 1851. XXV.--ON THE DISCOVERY OF MINUTE QUANTITIES OF SODA BY THE ACTION OF POLARIZED LIGHT. From the Report of the Britiah Association, 1852, p. 33. The double chloride of potassium and platinum crystallizing in regular octahedrons, exercises, when placed in the dark field of the polariscope, no depolarizing action; and the same remark applies to the bichloride of platinum in consequence of its imperfect crystallization. On the other hand, the chloride of sodium and platinum in thin crystalline plates is remarkable for its depolarizing power, and a trace of this salt, which is invisible to the naked eye, may be at once detected by the brilliant display of prismatic colours which it exhibits under the action of polarized light. The author applies this property to the detection of soda in the following way. The other bases having been removed by the ordinary methods, and the alkalies converted into chlorides, a drop of the solution is placed on a glass slide, and a very small quantity of a dilute solution of the bichloride of platinum added, avoiding as far as possible an excess of that reagent. The drop is then evaporated by a gentle heat till it begins to crystallize, and afterwards placed in the field of a microscope furnished with a good polarizing apparatus. On turning the analyser till the field becomes perfectly dark, and excluding carefully the entrance of light laterally, the crystals remain quite invisible if either potash alone or no alkali whatever be present; while the presence of the...
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Add this copy of The Scientific Papers of the Late Thomas Andrews .. to cart. $63.96, new condition, Sold by Booksplease rated 4.0 out of 5 stars, ships from Southport, MERSEYSIDE, UNITED KINGDOM, published 2015 by Arkose Press.
