A text-book on chemistry : for the use of schools and colleges . n apparatus suited forthis purpose is shown in Fig. 172. Thepolar wires of the battery enter the sidesof a globular glass vessel full of water, andover their terminations tubes are invertedin which to receive the gases. The hy-drogen is double the volume of the ox-ygen. Another form of the same apparatusis seen in Fig. 173. In a bent tubefull of water, the platina wires, N P,are introduced by means of corks. Onthe current passing, oxygen is collectedin one of the branches of the tube andhydrogen in the other. Lavoisier determined
A text-book on chemistry : for the use of schools and colleges . n apparatus suited forthis purpose is shown in Fig. 172. Thepolar wires of the battery enter the sidesof a globular glass vessel full of water, andover their terminations tubes are invertedin which to receive the gases. The hy-drogen is double the volume of the ox-ygen. Another form of the same apparatusis seen in Fig. 173. In a bent tubefull of water, the platina wires, N P,are introduced by means of corks. Onthe current passing, oxygen is collectedin one of the branches of the tube andhydrogen in the other. Lavoisier determined the compositionof water by passing its vapor over piecesof iron made red hot in a tube. Thus,if from the retort, a, Fig. 174, containing boiling water,steam is passed through a red-hot iron tube, c c, filledwith turnings of iron, or iron wire, decomposition takesplace, black oxide of iron forming, and hydrogen gasescaping by the tube,y, into the gas-holder, m n. How may the analysis of water be effected ? Describe the principle ofLavoisiers analysis of DECOMPOSITION OF WATER. 187
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