The Philosophical magazine; a journal of theoretical, experimental and applied physics . t time from Mr. (.. II. Lees, , Derby of the Owens College. His cooperation has since been discon-tinued, owing to absence at Strasburg. I Density of the Electrolyte al the Electrodes. ni is necessary in order to see the streaks, wbicli, like the sur-rounding electrolyte, are colourless, and are only visible onaccount of the difference between their index of refractionand that of the main bulk of the electrolyte. A vessel withparall(4 sides of good plate-glass was employed, and a
The Philosophical magazine; a journal of theoretical, experimental and applied physics . t time from Mr. (.. II. Lees, , Derby of the Owens College. His cooperation has since been discon-tinued, owing to absence at Strasburg. I Density of the Electrolyte al the Electrodes. ni is necessary in order to see the streaks, wbicli, like the sur-rounding electrolyte, are colourless, and are only visible onaccount of the difference between their index of refractionand that of the main bulk of the electrolyte. A vessel withparall(4 sides of good plate-glass was employed, and a mirrorused to reflect light obliquely into the cell. The arrangementwhich has been found to be most convenient is shown in thefigure, and consists of a cell made of two pieces of plate-glassabout 15 centim. square. A piece of india-rubber, 25 and 3 centim. square section, is bent in a semicircularform and clamped between the two glass plates by means offour iron screw-clamps. In this way a water-tight cell, about1*5 centim. broad, is obtained which may readily be taken to. pieces for the purpose of cleaning. The electrodes haveusually consisted of two pieces of palladium^ about 05 and with a surface of 5 square centim., fastened toplatinum wires and supported by means of a convenientelectrode-holder. Streaks obtained in dilute pure Sulpliuric Acid. The electrodes were first heated to redness in order to driveout any occluded gas, and then cleaned by means of glass-paper. They were then placed, by means of the electrode-holder H, in the electrolytic cell containing dilute puresulphuric acid. The current w^as sent from one electrode (A)to the other (B), which is thus the kathode, for a certain timeand then reversed. On reversal no gas appears at first fromB, which is now the anode, but streaks resembling a denseliquid are with careful observation seen flowing downwardsfrom this electrode. After a time, depending on the size ofthe electrodes, the strength
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