Philosophical Magazine: A Journal of Theoretical, Experimental and Applied Physics

Taylor & Francis., 1863

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Pàgina 406 - The immediate cause of the phenomena of heat then is motion, and the laws of its communication are precisely the same, as the laws of the communication of motion.
Pàgina 452 - II.) that the thermal effect is approximately proportional to the difference of pressure on the two sides of the plug. The...
Pàgina 180 - Thinly scattered as these latter are, we might naturally think meanly of them as barriers to the waves of heat. We might imagine that the wide spaces...
Pàgina 239 - Prof. Stokes mentioned to me at Cambridge some time ago, probably about ten years, that Prof. Miller had made an experiment testing to a very high degree of accuracy the agreement of the double dark line D of the solar spectrum with the double bright line constituting the spectrum of the spirit-lamp burning with salt.
Pàgina 9 - Do not the vast masses of basalt, the general appearances of mountain-ranges, the violent distortions and fractures of strata, the great prevalence of metamorphic action (which must have taken place at depths of not many miles, if so much), all agree in demonstrating that the rate of increase of temperature downwards must have been much more rapid, and in rendering it probable that volcanic energy, earthquake shocks, and every kind of so-called plutonic action, have been, on the whole, more abundantly...
Pàgina 14 - ... in some places, or, at all events, it may be held up by the viscidity of the liquid; until it has acquired some considerable thickness sufficient to allow gravity to manifest its claim, and sink the heavier solid below the lighter liquid. This process must go on until the sunk portions of crust build up from the bottom a sufficiently close ribbed solid skeleton or frame, to allow fresh incrustations to remain bridging across the now small areas of lava pools or lakes.
Pàgina 182 - ... diffused in the air. The cylinder which contained the air through which the calorific rays passed was polished within, and the rays which struck the interior surface were reflected from it to the thermo-electric pile which measured the radiation. The following objection was raised : — You permit moist air to enter your cylinder ; a portion of this moisture is condensed as a liquid film upon the interior surface of your tube ; its reflective power is thereby diminished ; less heat therefore...
Pàgina 407 - La force mecanique qui apparait pendant 1'abaissement de temperature d'un gaz comme de tout autre corps qui se dilate, est la mesure et la representation de cette diminution de chaleur.
Pàgina 239 - ... of refrangibility of the double line D. Hence the presence of sodium in a source of light, must tend to originate light of that quality. On the other hand vapour of sodium in an atmosphere round a source must have a great tendency to retain in...
Pàgina 230 - For instance, the orange ray may be the effect of the strontia, since Mr. Herschel found in the flame of muriate of strontia a ray of that colour. If this opinion should be correct, and applicable to the other definite rays, a glance at the prismatic spectrum of a flame may show it to contain substances which it would otherwise require a laborious chemical analysis to detect.

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