The London, Edinburgh and Dublin Philosophical Magazine and Journal of ScienceTaylor & Francis, 1885 |
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Altre edizioni - Visualizza tutto
The London, Edinburgh and Dublin Philosophical Magazine and Journal of Science Visualizzazione completa - 1904 |
The London, Edinburgh and Dublin Philosophical Magazine and Journal of Science Visualizzazione completa - 1894 |
The London, Edinburgh and Dublin Philosophical Magazine and Journal of Science Visualizzazione completa - 1901 |
Parole e frasi comuni
acid acquiring the higher æther amalgamated zinc ampere apparatus Average axis Ayrton and Perry bromide cadmium calculated chemical action chemical affinity chloride suspended circuit coil conductor contact-force copper corresponding Daniell cell deflection difference of potential effect electricity electro-copper electro-silver electrodes electrolytes electromotive force energy equation experimental experiments fact Faraday film following values formula galvanometer gramme-degrees H₂O heats of formation Hence hydrogen immersed increase induction interglacial iodide iron Julius Thomsen junction lamp lines of force liquid magma maximum means measured mercury metals method millim molecular molecules motion negative nitrate observed paper Pellat Peltier Peltier effect Phil plane plates platinum Pogg polarization positive Probable error produced Prof resistance revolving ring rotation salt silver chloride solution-strength strength 25 surface temperature theory thermoelectric thermovoltaic constant Thomson tion tube values were obtained velocity volt Volta effect voltaic constant wire zinc-sulphate solution
Brani popolari
Pagina 136 - IN physical science a first essential step in the direction of learning any subject is to find principles of numerical reckoning and practicable methods for measuring some quality connected with it. I often say that when you can measure what you are speaking about and express it in numbers you know something about it ; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a...
Pagina 28 - Sannikow found the skulls and bones of horses, buffaloes, oxen, and sheep in such abundance that these animals must formerly have lived there in large herds. At present, however, the icy wilderness produces nothing that could afford them nourishment, nor would they be able to endure the climate. Sannikow concludes that a milder climate must formerly have prevailed here, and that these animals may therefore have been contemporary with the mammoth, whose remains are found in every part of the island."...
Pagina 29 - The evidence, then," says Mr. Howorth, "of the debris of vegetation, and of the fresh-water and landshells found with the mammoth remains, amply confirms the a priori conclusion that the climate of Northern Siberia was at the epoch of the mammoth much more temperate than now. It seems that the botanical facies of the district was not unlike that of Southern Siberia; that the larch, the willow, and the Alnaster were probably the prevailing trees, that the limit of woods extended far to the north of...
Pagina 178 - ... then the solution of iodide placed there, being in contact with platina at both surfaces, exerts no chemical affinities for that metal; or if it does, they are equal on both sides. Its power, therefore, of forming a current in opposition to that dependent upon the action of the acid in the vessel...
Pagina 256 - Now remember that oxygen is an electro- negative element ; and without endeavouring to examine too precisely what signification is involved in that statement, it will be not out of accord with orthodox views if we assume that it means that at least any dissociated oxygen atoms are negatively charged, each with the characteristic charge of a free dyad atom. Granting something equivalent to this, without...
Pagina 28 - eleven versts above Krestowkoje, in lat. 72°, he found, in a layer of soil covered with clay on the upper edge of the banks of the Yenissei^ well-preserved stems like those of the birch, with their bark intact, and sometimes with their roots attached, and three to four inches in diameter. Professor Merklin recognizes them as those of the Alnaster fruticosus, which still grows as a bush on the islands of the Yenissei, in lat, 70^° IS'.
Pagina 150 - I now think it quite certain that two metals dipped in one electrolytic liquid will (when polarization is done away with) reduce two dry pieces of the same metals when connected each to each by metallic arcs to the same potential...
Pagina 130 - ... powerful current of electricity. On reversing the order of rotation, the electrical current was reversed. The direction of the electricity was the same as if the copper cylinder (219.) or a copper wire had revolved round the fixed magnet in the same direction as that which the magnet itself had followed. Thus a singular independence of the magnetism and the bar in which it resides is rendered evident.
Pagina 208 - ... with earth. At the same time it is satisfactory to find this view confirmed by a series of carefully conducted experiments, and to know that the condensers may be relied on as true and good measures of electrical capacity. There however seems to be some difficulty in getting a permanent condenser, and so far as I am aware it has not yet been accomplished.
Pagina 159 - ... experiments in which he found no difference in the Voltacontact-electromotive force between zinc and copper, whether tested in dry or damp air, oxygen, nitrogen, hydrogen, carburetted hydrogen, or carbonic acid, so long as no visible chemical action occurred ; and that De la Rive was not right when he " asserted that there was no Volta effect in the slightly rarefied air then known as vacuum.