The London, Edinburgh and Dublin Philosophical Magazine and Journal of ScienceTaylor & Francis, 1890 - English periodicals |
Contents
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Common terms and phrases
apparatus atomic weights axis boiling-point bolometer bulb calculated carbonic carbonic acid cent centim centimetres charge chemical circle of latitude coil cold bands conductivity conductor constant corresponding curve deflexion density determined diameter direction distance doublets effect electric electrification electrodes electrolytic electromotive force elements equation experiments galvanometer gases given glass greater hydrochloric acid hydrogen increase insulated iron J. J. Thomson liquid litres lunar magnetizing force maximum mean measured mercury metal method millim millimetre mirror molecular molecules motion nearly nickel observed obtained paper passing Phil plane plate platinum position pressure produced Prof quantity radiation radius Regnault resistance rings rotation solution specific heats spectrum spheres stannic chloride steel substance surface Table temperature theory tion transient current tube twist vapour velocity vibration viscosity wave wave-length wire zero zinc
Popular passages
Page 31 - Though the surface of the full moon exposed to us, must necessarily be very much heated, — possibly to a degree much exceeding that of boiling water...
Page 452 - Committees for the several Sections before the beginning of the Meeting. It has therefore become necessary, in order to give an opportunity to the Committees of doing justice to the several communications, that each Author should prepare an Abstract of his Memoir, of a length suitable for insertion in the published Transactions of the Association, and...
Page 156 - N2 rebound but coalesce, and the entire stream of water, both ascending and descending, appears to become coherent. Now it seems to me certain that the innumerable minute particles of water generated in the steam-jet, each consisting perhaps of only a few molecules, must necessarily come into frequent collision with one another; for we cannot suppose that they all travel with equal velocities and in exactly the same direction ; and there is no reason why they should not behave just in the same manner...
Page 175 - Beforehand the diurnal variation of the barometer would have been expected to be much more conspicuous than the semi-diurnal. The relative magnitude of the latter, as observed at most parts of the earth's surface, is still a mystery, all the attempted explanations being illusory. It is difficult to see how the operative forces can be mainly semi-diurnal in character; and if the effect is so, the readiest explanation would be in a near coincidence between the natural period and 12 hours. According...
Page 174 - Sound," § 333. If r be the radius of the earth, the equation determining the frequency of the vibration corresponding to the harmonic of order h is...
Page 51 - Cf the numerous conclusions to be drawn from this research, we here only direct the reader's attention to what we consider the most important one, namely : — That the mean temperature of the sunlit lunar soil is much lower than has been supposed, and is most probably not greatly above zero Centigrade.
Page 83 - Quaternions; and it is particularly noteworthy that it was invented by one of the most brilliant Analysts the world has yet seen, a man who had for years revelled in floods of symbols rivalling the most formidable combinations of Lagrange, Abel, or Jacobi. For him the most complex trains of formulae, of the most artificial kind, had no secrets: — he was one of the very few who could afford to dispense with simplifications: yet, when he had tried quaternions, he threw over all other methods in their...
Page 134 - Still it was soft, and by tempering would doubtless have doubled this value. If forged nickel and tungsten can be made to maintain a specific magnetism of 10, it will form a useful addition to the resources of physical laboratories. From the high polish of which it is susceptible and its freedom from damaging atmospheric influences, it will be most happily suited for the manufacture of mirror magnets where magnetic damping is to be employed.
Page 155 - ... somewhat greater proportion than the other colours. Electrification of the jet causes the violet to disappear completely, while the luminosity of the blue and the more refrangible part of the green is materially decreased. The orange and red are, I believe, quite unaffected. From these facts it may be concluded that electrification causes an increase in the size of the water particles contained in the steam-jet. In the unelectrified condition the majority of these particles are small in relation...
Page 167 - So a few remarks on the subject may not be out of place. The corona is generally described as " a whitish silvery patch surrounded by a brownish fringe,