The Voltaic Cell: Its Construction and Its CapacityJ. Wiley, 1893 - 562 pages |
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Common terms and phrases
Accumulator acidulated water action Aluminium ammonium chloride ampere-hours amperes Antimony battery Becquerel Bismuth Cadmium calories carbon cent charge chemical reaction chromic circuit Cobalt conc connected containing copper sulphate couple cylinder Daniell cell decomposition depolarizer deposited difference dilute sulphuric acid discharge disengaged disks dissolved elec electricity electrode electrolyte electromotive force element exciting liquid glass grams grid heat hydrochloric acid hydrogen immersed Indium internal resistance Iridium iron lead peroxide Magnesium manganese mercury metal mixture negative electrode Nickel nitrate nitric acid obtained ohms oxide oxygen Palladium placed platinum Platinum or gold polarization porous cup positive electrode potash produced Rh Rh Rhodium salt Silicium silver soda sodium chloride solution of copper solution of sodium solution of zinc sulph sulphate of copper sulphate of zinc sulphuric acid surface Tellurium temperature Thallium tion Tommasi tube vessel voltaic voltmeter volts wire zinc sulphate ZincHg
Popular passages
Page 10 - In place of the term pole, I propose using that of electrode,* and I mean thereby that substance, or rather surface, whether of air, water, metal, or any other body, which bounds the extent of the decomposing matter in the direction of the electric current.
Page 250 - ... boilingpoint ; the salt, which is a nearly insoluble white powder, should be well washed in distilled water, and care should be taken to obtain it free from the mercuric sulphate (persulphate), the presence of which may be known by the mixture turning yellowish on the addition of water. The careful washing of the salt is a matter of essential importance, as the presence of any free acid, or of persulphate, produces a considerable change in the electromotive force of the cell.
Page 11 - The anode is therefore that surface at which the electric current, according to our present expression, enters: it is the negative extremity of the decomposing body; is where oxygen, chlorine, acids, etc., are evolved ; and is against or opposite the positive electrode. The cathode is that surface at which the current leaves the decomposing body, and is its positive extremity ; the combustible bodies, metals, alkalies, and bases, are evolved there, and it is in contact with the negative electrode.
Page 10 - ... and they of course, when in contact with that body, are the limits of its extent in the direction of the current. The term has been generally applied to the metal surfaces in contact with the decomposing substance; but whether philosophers generally would also apply it to the surfaces of air and water, against which I have effected electrochemical decomposition, is subject to doubt.
Page 307 - ... soldered junctions, and with them to obtain the results. I now come to the special point which is the occasion of this communication. A few days ago I was investigating the effect of static charges communicated to the plates on the sensitive and insensitive states, and in the course of these experiments I found that if a Voss machine, not in any way connected with the cell or the electrometer, was worked in the room while the cell was in the insensitive state, the moment a spark passed between...
Page 6 - ... placed between two different from each other of the first class, or, contrariwise, one of the first class is placed between two of the second class different from each other, an electric stream is occasioned by the predominating force either to the right or to the left ; a circulation of this fluid, which ceases only when the circle is broken, and which is renewed when the circle is again rendered complete.
Page 7 - The chemical theory assumes, that at the place of action, the particles which are in contact act chemically upon each other and are able, under the circumstances, to throw more or less of the acting force into a dynamic form...
Page 9 - By current, I mean anything progressive, whether it be a fluid of electricity, or two fluids moving in opposite directions, or merely vibrations, or, speaking still more generally, progressive forces.
Page 10 - ... and for the sake of greater precision of expression than I can otherwise obtain, I have deliberately considered the subject with two friends, and with their assistance and concurrence in framing them, I purpose henceforward using certain other terms, which I will now define. The poles, as they are usually called, are only the doors or ways by which the electric current passes into and out of the decomposing body...
Page 251 - ... wax. Contact with the mercury may be made by means of a platinum wire passing down a glass tube, cemented to the inside of the cell, and dipping below the surface of the mercury, or more conveniently by a small external glass...