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Updated: June 22, 2025
The copper may be very easily and rapidly separated from the double ammonium oxalate salt, provided a sufficient excess of ammonium oxalate is present. Weak currents cannot be employed for the determination of this element when it is present in large quantities, for under such circumstances the metal does not adhere with sufficient firmness to the electrode.
In the latter case, unless some judgment is used, one of the electrodes might glow more intensely than the other. But on the whole I find it preferable when using such high frequencies to employ only one electrode and one connecting wire.
The reduction may be accelerated by the addition of some ammonium sulphate. The antimony separates out as a fine, light gray precipitate on the electrode, and which adheres very firmly, provided the precipitation has not been carried on too rapidly, i. e., if the current employed for the reduction was not too strong.
In this manner, I obtain a powerful and odorless battery, having all the valuable qualities of the Leclanche, and one that permits of a renewal of the potash solution as well as of the negative electrode. But by replacing the thin zinc rod by a zinc cylinder of large surface, 21/2 times as much copper is precipitated in the same time.
The apparatus in question consists of a concave sponge electrode, the concavity of which corresponds to the convexity of the external aspect of the cranium. Above the electrode is a chamber of metal or India-rubber, designed to contain ice.
One day we went down to the round-house of the Cincinnati & Indianapolis Railroad and connected up the long wash-tank in the room with the coil, one electrode being connected to earth. Above this wash-room was a flat roof. We bored a hole through the roof, and could see the men as they came in. The first man as he entered dipped his hands in the water.
When this is done the plates will be positively charged alternately with every reversal of the current in which case there will be no break in the continuity of the oscillations set up and therefore in the waves that are sent out. The Operation of Rectifier Vacuum Tubes. The vacuum tube rectifier is simply a two electrode vacuum tube. The Operation of Reactors and Condensers.
A quantity of "electrode matter" will be shot off from the silver pole, and practically none from the aluminum pole; but you see that in each case the phosphorescence, CC', is identical. Had the radiant electrode matter been the active agent, the more intense phosphorescence would proceed from the more volatile pole.
It consists of a glass tube with a bulb blown at one end and a small bundle of carbon wool, C, fixed in the center, and exhausted to a pressure of 0.000076 millimeter, or 0.1 M. The negative electrode, A, is formed by coating part of the outside of the bulb with silver, and it is in such a position that the focus of rays falls upon the carbon wool.
To whatever extent the aluminium tube performs the function of a screen, its usefulness is therefore limited to very high degrees of exhaustion when it is insulated from the electrode that is, when the gas as a whole is non-conducting, and the molecules, or atoms, act as independent carriers of electric charges.
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