The London, Edinburgh and Dublin Philosophical Magazine and Journal of ScienceTaylor & Francis, 1917 - Physics |
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Common terms and phrases
absorption adiabatic adiabatic invariant æther after-image apparatus approximately axis B₁ brightness calculated centre coefficients colour component condenser constant coordinates corresponding critical speed curve deflexion density determined dilution distance double-layer electric electromotive forces electrons emission equal equation equipartition of energy experimental experiments expression ferromagnetic field flame flicker photometer formula frequency gases given glass heat hydrogen hypergeometrical series hysteresis increase intensity intrinsic potentials kinetic lattice lines liquid magnetic means measured membrane mercury metals method mixed vapours mixture molecular molecules molybdenite motion observed obtained optical optical contact osmotic pressure oxygen paper parallel partial pressure particles Phil photometer plane plate positive primary pure solvent R₁ radiation ratio rays refractivity resistance rotation shown solution solvent spectrum string strip surface surface-tension Table temperature theory tube values vapour pressure velocity vibration volts wave-length xenotime zero
Popular passages
Page 234 - ... apparently no Al emission at the above temperatures. Judging by the very low boiling-point the salt could only be in a state of vapour, and the emission above could be accounted for, in part at least, by the distilled water (see § 6). It is evident that the K emission is present, but whether the high values by the balance method are caused by the presence of some heavy ion or are due to the motion of the strip is a matter of doubt. It is unfortunate that the initial emission beginning with 150°...
Page 228 - In the tables that follow, w/H is the ratio of the mass of the ion to that of an H-ion in electrolysis on the supposition that it carries an equal charge. The charge of an H-ion was taken to be 9649 electromagnetic units. B and S refer to the " balance " and " slit " methods of measurement respectively. 1. Silver Chloride. (a) The first specimen used was probably fairly pure, but it was considerably darkened by exposure. A very small amount wa* moistened with distilled water and placed on the strip,...
Page 380 - Of course a strict mathematical proof of their existence is a desideratum ; but I think that the reader, who follows the results of the calculations here put forward, is likely to be convinced that permanent waves of moderate height do exist^.
Page 468 - ... the atomic absorption coefficient expresses the proportion of the energy of an X-ray pencil which is absorbed in crossing a surface on which lies one atom to every square centimetre.
Page 247 - ... In the range of temperature between that of the room and a brilliant red heat this mineral exists in two distinct states. (2) The resistance in the low voltage or low temperature state is very nearly an inverse exponential function of the absolute temperature. (3) At ordinary room temperatures the resistance is a function of the applied potential difference and appears to approach the value infinity as the potential approaches the value zero. (4) The conduction of electricity is evidently carried...
Page 165 - ... is from an infinitely narrow slit (or, what comes to the same, a slit of finite width at an infinite distance), and that the apertures are rectangular. The problem may then be supposed to be in two dimensions*, although in strictness this requires that the elementary sources distributed uniformly along the length of the slit should be all in one phase. The calculation makes the usual assumption, which cannot be strictly true, that the effect of a screen is merely to stop those parts of the wave...
Page 190 - This phenomenon seems therefore to lend definite support to the existence of an electromagnetic aether. It is, perhaps, the only low-frequency phenomenon which cannot easily be described in terms of " action at a distance
Page 275 - Vicing observed. Glass surfaces can be polished without difficulty so nearly flat — or so nearly of the same curvature — that, when carefully cleaned and freed from dust, they show less than one interference-fringe per inch when placed together and examined by light, reflected from the interfaces. Such surfaces can be pressed into optical contact by the application of pressure of several pounds per square inch, and the pieces of glass act as one for optical purposes : for example, if the hypotenuse...
Page 166 - ... represented by the sum of the squares of the integrals, is an even function. The field of view is thus symmetrical with respect to the axis. The integrals in (6) may be at once expressed in terms of the so-called sine-integral and cosine-integral defined by e.
Page 493 - «2=l + <r/P. ................................. (8) thus remaining finite. Helmholtz in his investigation also introduces a dissipative force, as is necessary to avoid infinities when n=p, but one differing from Maxwell's, in that it is dependent upon the absolute velocity of the atoms instead of upon the relative velocity of aether and matter. A more important difference is the introduction of an additional force of restitution (a3x), proportional to the absolute displacement of the atoms.