. Elements of chemistry ... fdecomposed bodies follow an invariable law in respect to theelectrical sides on which they arrange themselves. Thus, indecomposing water, or other compounds containing its ele-ments, the hydrogen escapes at the negative pole, and theoxygen at the positive. In the decomposition of the salts(see Salts) and other compounds, this law is in every in-stance observed, the same kind of element being alwaysdisengaged at the same pole of the battery. When a compound consists of two gaseous elements, theymay be readily separated, and each gas obtained separate,by placing the
. Elements of chemistry ... fdecomposed bodies follow an invariable law in respect to theelectrical sides on which they arrange themselves. Thus, indecomposing water, or other compounds containing its ele-ments, the hydrogen escapes at the negative pole, and theoxygen at the positive. In the decomposition of the salts(see Salts) and other compounds, this law is in every in-stance observed, the same kind of element being alwaysdisengaged at the same pole of the battery. When a compound consists of two gaseous elements, theymay be readily separated, and each gas obtained separate,by placing the compound in a bent tube, and then exposingit to the galvanic action. This simple arrangement is represented by Fig. 29. Will electricity produce the same chemical effects as galvanism ? Was thedecomposition of water effected by electricity before the discovery of gal-vanism ? Of what use has galvanism been to chemistry ? In the decom-position of water by galvanism, at which pole of the battery does hydro-gen always escape ?. 72 CHEMICAL EFFECTS OF GALVANISM. It consists of a glass tube, bent asin the figure, a small orifice being Fig. 29. ground at the angle so as to let in thewater; or instead of this, two tubesmay be used with their lower endsplaced in contact. The tubes beingfilled with water, and their lower endsplaced in a dish of the same fluid, thetwo platina wires proceeding from thetwo sides of the battery are passedthrough corks in the upper ends of thetubes, and pushed down, so as to come within about theeighth of an inch of each other. Care must be taken that theadjustment be such as to allow the gases as they ascend tocome within the orifices of the tubes. 155. The battery being now set in action, small bubblesof gas will be seen to arise from the ends of the wires, butin different quantities. The tube from the negative wirewill soon be filled with hydrogen gas, while the other inthe same time will be only half filled with oxj-gen. Thiscircumstance arises from the
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