Proceedings of the American Academy of Arts and Sciences Volume 28, no. 20

 
9781236052865: Proceedings of the American Academy of Arts and Sciences Volume 28, no. 20
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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. 1893 Excerpt: ... then poured into distilled water, and a solution of normal nitrate was thus obtained after the basic salt had been filtered off. This solution was treated a number of times with zincic hydrate,--which had been precipitated by ammonia and washed until free from the salts of this base,--and allowed to stand. The filtered solution was evaporated to dryness and heated in a porcelain crucible to about 240 C. over a ring burner. Part of this was analyzed at once (Experiment 8), part heated by a Bunsen burner (Experiments 9 and 10), and part ignited at a very high temiy furnace with the blast lamp and bellows md 12). Experiment 13 was made with a soft n the basic nitrate. isive were made from oxide obtained as fol e of commerce was dissolved in nitric zincic carbonate was added to this solution hole was allowed to stand with occasional ind finally filtered and evaporated rapidly by boiling. This gave a sample of the oxide which was very nearly white after intense heating in a double porcelain crucible. In Experiments 22 and 23, pure oxygen was introduced into the flame of the blast lamp used for igniting the zincic oxide, the bottom of the outer crucible being melted where the flame struck it. The material analyzed in Experiment 22 was taken from the layer nearest to the zincic silicate formed in the bottom of the crucible by fusion of the glaze, and that used in Experiment 23 was taken from the top. The zincic oxide of Experiment 24 was heated to bright yellow heat in the same way. All the edges of the porcelain were rounded, and the cover and the crucible itself were fused to the heavy iron supports on which they rested. After twelve minutes the iron itself began to burn and the ignition was stopped. The oxide was found to be " sintered together," and...

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