The London, Edinburgh and Dublin Philosophical Magazine and Journal of ScienceTaylor & Francis, 1898 |
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Altres edicions - Mostra-ho tot
The London, Edinburgh and Dublin Philosophical Magazine and Journal of Science Visualització completa - 1904 |
The London, Edinburgh and Dublin Philosophical Magazine and Journal of Science Visualització completa - 1894 |
The London, Edinburgh and Dublin Philosophical Magazine and Journal of Science Visualització completa - 1901 |
Frases i termes més freqüents
accuracy acid adjusted æther alternating currents amperes angle apparatus bars bulb calculated carrier cathode cell centim centre charge circuit circular cloud coefficients coil condenser constant cooling copper corresponding curve cylinder deflection deflexion determined disk distance effect electric electrification electrode electrodynamometer electrolyte electrometer electromotive force equal equation error experiments film force formula gases girder given gives glass Heat Transmission Hence hydrogen inductor integral intensity isomorphisms isopentane J. J. Thomson light lines liquid Lord Kelvin magnetic measured mercury metal method millimetre minute motion mutual inductances nearly negative observed obtained oxygen paper Phil phosphorescence plane plate positive potential pressure radius Rate of Heat ratio rays reflector resistance scale self-induction solution spherometer surface temperature tensions thermometer tube variation velocity vertical volume waves wire zero zinc µs²
Passatges populars
Pàgina 33 - We may legitimately infer that each additional diminution of a millionth would produce a still greater retardation of cooling, so that in such high vacua as exist in planetary space the loss of heat — which in that case would only take place by radiation — would be exceedingly slow.
Pàgina 370 - If this body temperature is the same at the end as at the beginning of the experiment then it is obvious that the heat produced must have been equal to the heat lost.
Pàgina 281 - A very interesting account will be found in the paper above cited, which was read to the French Academy of Sciences on the same evening, curiously enough, as ours was read before the Royal Society of Edinburgh.] These first experiments were made with no screen placed between the uranium and the charged body. We afterwards found that there was also a discharging effect, though much slower, when the uranium was wrapped in tinfoil. The effect was still observable when an aluminium screen was placed...
Pàgina 281 - Moissan we have had a disc of this metal, about 5 cm. diameter and | cm. thickness, placed at our disposal. We made a few preliminary observations on its diselectrifying property. We observed first the rate of discharge when a body was charged to different potentials. We found that the quantity lost per half-minute was very far from increasing in simple proportion to the voltage, from 5 volts up to 2100 volts ; the electrified body being at a distance of about 2 cm.
Pàgina 177 - ... until, when this is equal to the velocity of light, both the magnetic force and the electric intensity vanish at all parts of the field except the equatorial plane, and in this plane they are infinite. The pulses started by the stopping of the charged particle are, as might be expected, different when the ratio of the velocity of the particle to that of light is small, and when it is nearly unity. But even when the velocity is small, the pulse started by stopping the particle carries to an external...
Pàgina 205 - Complete sets (in Numbers) may be obtained at the following prices : — The First Series, in 20 volumes, from 1838 to 1847. Price £10. The Second Series, in 20 volumes, from 1848 to 1857. „ £10. The Third Series, in 20 volumes, from 1858 to 1867. „ £12. The Fourth Series, in 20 volumes, from 1868 to 1877. „ £12. The Fifth Series, in 20 volumes, from 1878 to 1887.
Pàgina 66 - ... instrument made by suspending a piece of soft iron at an angle of 45°, as invented by Lord Rayleigh, is also probably more sensitive. For this reason I have introduced here many new methods, depending upon adjusting two currents to a phase-difference of 90° which I believe to be a new principle. This I do by passing one current through the fixed and the other through the suspended coil of an electrodynamometer. By this means a heavy current can be passed through the fixed coils and a minute...
Pàgina 99 - Lord Kelvin, in a paper dated April 12, I860,* entitled "Measurement of Electromotive Force required to produce a Spark," states that '• there is a much less rapid variation with distance of the electrostatic force preceding a spark at the greater than at the smaller distance. It seems most probable that at still greater distances the electrostatic force will be found to be sensibly constant, as it was certainly expected to be at all distances.
Pàgina 282 - ... [Sensibility of electrometer 140 scale-divisions per volt.] After that the electrometerreading remained steady at this point, which we may call the uranium rays-zero for the two metals separated by air which was traversed by uranium rays. If instead of having the uranium opposite to the aluminium, with only air between them, the uranium was wrapped in a piece taken from the same aluminium sheet, and then placed opposite to the insulated polished aluminium disk, no deviation was produced.
Pàgina 423 - ... becomes positive to another platinum disc which had not been so treated, but had simply been left undisturbed in the apparatus. The positive quality thus produced by the hydrogen diminishes gradually, and becomes insensible after two or three days.] PS — On December 24, 1880, one of two platinum plates in the Volta-condenser was taken out ; placed in dried oxygen gas for forty-five minutes; taken out, carried by hand, and replaced in the Volta-condenser at 12.30 on that day. It was then found...