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Through the other opening passes a glass tube bent at an acute angle and connected by a short rubber tube to an adjoining flask, two-thirds filled with decinormal baryta solutions. These connections are all made air tight. Sulphuric acid is allowed in small portions at a time to flow into the mixture.

The powder then hissed and fizzed, and sent out blue and green sparks, and the smoke rose till you could neither see, nor breathe, nor gasp. Mellish, however, was used to it. "Nitrate of strontia," he shouted; "baryta, bone-meal, etcetera! Thousand cubic feet smoke per cubic inch. Not a germ could live not a germ, Y' Excellency!"

The Sulphates in the cases include glauber salt, or sulphate of soda; heavy spar or sulphates of baryta, among which are some splendid crystallisations from Piedmont, Hungary, Spain, and other countries; sulphate of strontia, known also as celestine, among which are some delicate blue crystals from Sicily; sulphates of lime, as gypsum, including some fine specimens of alabaster, and the fibrous sulphate known vulgarly as tripe-stone.

Caustic baryta was applied to the printed sheet to convert the resinous ingredients of the ink into an insoluble soap, the stearine being precipitated with sulphuric acid. The letters were then transferred to the zinc by pressure, so as to be printed from. The process, though ingenious and of much interest at the time, has long ago been superseded by photographic methods.

As the coloring-matter of archil is not precipitated by baryta and magnesia, but changed to a purple, the baryta method, recommended by Pasteur, Balard, and Wurtz, and the magnesia test, are useless. Magenta may in course of time be removed by the precipitates formed in the wine. It is therefore necessary to test not merely the clear liquid, but the sediment, if any. Dr.

I found Sherlock Holmes alone, however, half asleep, with his long, thin form curled up in the recesses of his armchair. A formidable array of bottles and test-tubes, with the pungent cleanly smell of hydrochloric acid, told me that he had spent his day in the chemical work which was so dear to him. "Well, have you solved it?" I asked as I entered. "Yes. It was the bisulphate of baryta."

If, then, one has prepared a solution of baryta or lime, of which a certain volume is made turbid by the passage of a likewise known volume of CO , it will be easy to ascertain how much CO a certain air contains, from the volume of the latter that it will be necessary to pass through the basic solution in order to obtain the amount of turbidity that has been taken as a standard.

But, as this would not explode without the addition of some oxygen-bearing element, various oxygen-bearing salts were combined with it, such as nitrate of potassium, nitrate of ammonia, nitrate of baryta, etc. Also a great many of the first smokeless powders were made of low grade gun-cotton combined with nitro-glycerine in varying proportions.

Carbonic acid is evolved, and, passing into the adjoining flask, is absorbed by the baryta, precipitating it as carbonate. To prevent the precipitate forming around or choking up the entrance tube, the flask must be agitated at short intervals to break it off. The reaction so familiar to us in other determinations is expressed thus: MnO +KO,C O +2SO = MnO,SO +KO.SO +2CO ,

By using sulphate of baryta, ultramarine, oxide of chrome, etc., mixed with silicate of potash, fast colors are obtained similar to the semi-transparent colors of painted windows. By this means a variety of cheap painted glass may be made. Should these colors be fired in a furnace, enameled surfaces would be produced.