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Pure Oxygen for Inhalation

Eliot recommends for the preparation of oxycool and crumble into a dry hydrate; then mix it with charcoal, coke, or peat, and heat in a retort. The hydrate of lime (slacked lime) gives up the water that was used in slacking it, and becomes quicklime. The water is decomposed into hydrogen and carbonic acid, and these two gases can be separated by passing them through water, or the carbonic acid may gen gas, to be used in medicine, the employ- be economized by employing it in the manument of a mixture of equal parts of peroxide facture of bicarbonates. The quicklime can of barium and peroxide of lead. By pouring be again slacked and used as often as required. dilute nitric acid upon these salts, there is a 4044. Hydrogen Gas for Balloons. violent effervescence and a copious evolution For this purpose hydrogen may be obtained of pure oxygen gas. For greater security, by pouring slightly diluted muriatic acid upon the gas may be afterwards washed in water. an equal weight of zinc, in a covered vessel As very little heat is necessary, the operation having a small tap or stop-cock in the top for can be performed in any stout bottle, thus filling the balloons. The vessel should be dispensing with the usual retorts. For great made of lead, to prevent corrosion. purity, the first portion of gas that evolves should be allowed to escape, as it contains the air which was in the apparatus.

4039. To Obtain Oxygen on the Large Scale. Nitre is exposed to a dull red heat in an iron retort or gun barrel; 1 pound of nitre thus yields about 1200 cubic inches of oxygen, slightly contaminated with nitrogen. (Ure.)