. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. Chap. V-] ELECTROLYSIS. 51 is liberated at the positive pole, and hydrogen at the negative. The apparatus figured in Pig. 27, called a voltameter, is employed for showing this decomposi- tion. It consists of two tubes filled with water. The tubes are inverted in a vessel, also containing water, over strips of platinum. The strips are con- nected by wires to binding screws, to which the positive and negative wires of a battery are att
. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. Chap. V-] ELECTROLYSIS. 51 is liberated at the positive pole, and hydrogen at the negative. The apparatus figured in Pig. 27, called a voltameter, is employed for showing this decomposi- tion. It consists of two tubes filled with water. The tubes are inverted in a vessel, also containing water, over strips of platinum. The strips are con- nected by wires to binding screws, to which the positive and negative wires of a battery are Fig. 27.—The Voltameter, The liberated gases rise from the strips, and are collected in the tubes. The tube connected with the negative pole has twice as much gas (hydrogen) as that connected with the positive. Thus one obtains not only a qualitative but also a quantitative analysis. Pure water is not employed, because it is a bad conductor. The water must be acidulated, usually with sulphuric acid, and, of course, it may be really only the acid that is decomposed. Other solutions subjected to the passage of a current show similar results, different elements appearing at different electrodes. Salts may be decomposed by the current, the acid appearing at the positive, and the base at. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original M'Gregor-Robertson, J. (Joseph), 1858-1925. Philadelphia, H. C. Lea's son & co.
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