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Updated: June 21, 2025
Professor Nernst goes further, and has shown that the concentration currents which are produced when two electrodes of the same substance are plunged into two unequally concentrated solutions may be interpreted by the hypothesis that, in these particular conditions, the diffusion does bring about a separation of the ions.
What you get out of a voltaic cell depends on the composition and strength of the electrolyte, the kind of depolarizer used, the shape of the electrodes, the kind of surface they have, their arrangement and spacing, and a hundred other little things." "I've heard that," Siegel said. Thorn smoked in silence. He had heard Sorensen's arguments before.
Perhaps it was because I had been lying to this innkeeper stoutly for an hour past, and whether he believed me or not for the life of me I could not now determine. I sat up on the bed, presently, and adjusted the wires and diaphragms of the ether-wave mechanism. When in place it was all concealed under my shirt. As I switched it on, the electrodes against my flesh tingled a little.
"Then you should know, Mr. Siegel, that battery-making is an art, not a science. You don't just stick a couple of electrodes into a solution of electrolyte and consider that your work is done. With the same two metals and the same electrolyte, you could make batteries that would run the gamut from terrible to excellent.
A tube with electrodes enables the spectrum of the gas in process of distillation to be observed. In this manner, the spectra of the various gases may be seen following one another in the inverse order of their volatility. Everything leads to the belief that they show the existence on the earth of an earlier state of things now vanished.
"That's the electric furnace, sir," said Craig to me with an assumed deference, becoming a college professor explaining things to the son of a great financier. "You see the electrodes at either end? When the current is turned on and led through them into the furnace you can get the most amazing temperatures in the crucible. The most refractory of chemical compounds can be broken up by that heat.
Rinse the electrodes cautiously with alcohol and heat them in a hot closet until the alcohol has just evaporated, but no longer, since the copper is likely to oxidize at the higher temperature. Test the solution in the beaker for copper as follows, remembering that it is to be used for subsequent determinations of iron and zinc: Remove about 5 cc. and add a slight excess of ammonia.
A soft humming note began to vibrate through the inner laboratory a note which rose in pitch, steadily, as Herzog shoved the lever from one copper post to another, round the half-circle. "I am now heating the little firebrick furnace," said the scientist. "In Norway, they use an alternating current of only 5,000 volts, between water-cooled copper electrodes, as I have already told you.
When the charges rush together they form a current which burns out the air in the gap and this gives rise to the spark, and as the heated gap between the two electrodes is a very good conductor the electric current surges forth and back with high frequency, perhaps a dozen times, before the air replaces that which has burned out.
In the arrangement adopted on a working scale, the separated particles precipitate readily. As an illustration of the action upon organic matter in solution I take a small quantity of dye, mix it with water, and placing the connected iron electrodes in the mixture, the dye in solution separates into flocculent particles.
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