Identifier: philtrans02710483 (find matches)
Title: The Combining Volumes of Hydrogen and Oxygen
Year: 1916 (1910s)
Authors: Burt, F. Edgar, E.
Subjects: Proceedings of the Royal Society of London Philosophical Transactions of the Royal Society
Publisher: Royal Society of London

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, C, D (fig. 3), was charged with 250 gr. of finelypowdered crystals of ^ pure potassium permanganate in a dust-free atmosphere. Thepermanganate in the fifth tube, E, was three times re-crystallised from boiling water.The final crystallisation and subsequent drying were carried out in the decompositiontube itself. We may mention here that there was no difference in the results 400 DE. F. P. BUET AND DE. E. C. EDGAE ON whether oxygen was made by heating this tube or one of the other four. The mouthsof the five tubes were plugged with carefully cleaned glass wool. From the generating tubes the oxygen passed through a series of three washingtowers filled with glass beads. The first tower, F, contained a moderately strong solution of caustic potash; thesecond, G, a saturated solution of barium hydroxide. The column of liquid in eachtower was over a metre in height. Between the barium hydroxide tower and thenext washing vessel a manometer, H, was attached, to the train. The short tower, J,
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contained a stronger solution of potash, and the U-tube, K, a very concentratedpotash solution on pumice that had previously been heated in a stream of oxygen.From the U-tube, K, the gas passed through two tubes, L, L, containing sticks ofcaustic potash, and finally through two tubes, M, M, containing phosphoric oxide. The object of the two large alkaline towers was to retain oxides of manganese andcarbon dioxide. The two tubes, J and K, containing potash of increasing concentra-tion, served to diminish distillation of water from the towers to the stick potashtubes. After the apparatus had been in use for more than two years there was nosign of deliquescence either in the solid potash or in the phosphoric oxide. THE COMBINING VOLUMES OP HYDKOGEN AND OXYGEN. 401 When the washing and drying train had been set up it was exhausted by awater pump from three T-pieces simultaneously at N, O and P. Each of thepermanganate tubes was then heated in turn, the train being exhausted betweeneach ox

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