The Philosophical magazine; a journal of theoretical, experimental and applied physics . Polarization of Platinum Plates. 489 water-bath, and a thermometer, t, was suspended dippinginto the hquid of the voltameter, A battery of Grove cellswas used, the number of cells varying from 1 to 10. Thevoltameter was a glass tube of an inch in diameter, and sixinches high. The electrodes were strips of platinum about1| inch long and nearly j inch wide, connected by pieces ofplatinum wire which passed through the glass to binding- Fij?. 2. ^[2. screws fixed on a wooden collar which surrounded the neckof
The Philosophical magazine; a journal of theoretical, experimental and applied physics . Polarization of Platinum Plates. 489 water-bath, and a thermometer, t, was suspended dippinginto the hquid of the voltameter, A battery of Grove cellswas used, the number of cells varying from 1 to 10. Thevoltameter was a glass tube of an inch in diameter, and sixinches high. The electrodes were strips of platinum about1| inch long and nearly j inch wide, connected by pieces ofplatinum wire which passed through the glass to binding- Fij?. 2. ^[2. screws fixed on a wooden collar which surrounded the neckof the instrument. Tlie water-bath was contained in a coppervessel, and heated by a Bunsen burner. The electrolytic liquid consisted of a 10-per-cent. solutionof pure sulphuric acid (sp. gr. r842) in distilled water. Thevoltameter was emptied and refilled at the commencement ofeach days experiments, so that the solution never varied muchin strength. The thermometer employed was one whoseerror had been previously found to be negligibly small ; andit being necessary that the temperature of the liquid in thevoltameter should be accurately known, it was suspendedwith its bulb dipping into the liquid. Some experimentswere made to see whether error was likely to be introducedby this ; and it was found that when the stem of the thermo-meter was actually between the electrodes, it had a small butappreciable effect on the resistance of the column of liquid,but when the bottom of the bulb was above the top of theplates there was no measur
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