Proceedings of the Royal Society of London, Volume 49Taylor & Francis, 1891 |
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Overige edities - Alles bekijken
Proceedings of the Royal Society of London, Volume 18 Royal Society (Great Britain) Volledige weergave - 1870 |
Proceedings of the Royal Society of London, Volume 63 Royal Society (Great Britain) Volledige weergave - 1898 |
Proceedings of the Royal Society of London, Volume 13 Royal Society (Great Britain) Volledige weergave - 1864 |
Veelvoorkomende woorden en zinsdelen
acetic acid actinometer alloys appears asphyxia band bell-jar benzene bismuth bright candle unit carbon cells cent chemical action chloroform circuit CO₂ colour column contraction corresponding crystal curve Dacca described diagram discharge effect electric electrodes equal experiments expired F.R.S. Received fibres fibrils fluid force given heat heat of fusion hyaloplasm hydrogen inch inductive iron light lighter alloys lines liquid London luminosity magnetic means measure membrane metal method mirror mixture muscle nephridia nitric acid nitrite observations Observatory obtained optic axis oxygen paper percentage photographs placed plane plate position present pressure produced Professor proteid quantity re-breathing resistance Roscoe Royal salicyl-sulphonic acid sarcostyle sarcous elements screen shearing silver Society solution specimens spectra spectrum spongioplasm square stars steel stress stripe substance Sun's altitude surface Table temperature tion tissue tube uterus varicose velocity vitreous Young's modulus zinc
Populaire passages
Pagina 403 - Suppose now the alternation of the magnetic force to be produced by the rotation of a magnet M about any axis. First, to find the effect of the rotation, imagine the magnet to be represented by ideal magnetic matter. Let (after the manner of Gauss in his treatment of the secular perturbations of the solar system) the ideal magnetic matter be uniformly distributed over the circles described by its different points.
Pagina 405 - ... becomes a null magnet, the ideal magnetic matter in every circle of which it is constituted being annulled by equal quantities of positive and negative magnetic matter being laid on it. Thus, when the rotation is sufficiently rapid, the magnetic force is annulled throughout the space external to the shell. The transition from the steady force of M to the final annulment of force, when the copper shell is symmetrical round its axis of rotation, is, through a steadily diminishing force, without...
Pagina 19 - The main argument in favor of this conclusion was the presence of the bright fluting of carbon which extends from 468 to 474. This standing out bright beyond their short continuous spectrum gives rise to an apparent absorption band in the blue. . . . Direct comparisons...
Pagina 202 - ... photometric observations of the brightness of the continuous spectrum, as the pressure is varied, show that it is mainly produced by the mutual action of the molecules of a gas. Experiments on the sodium spectrum were carried up to a pressure of forty atmospheres without producing any definite effect on the width of the lines which could be ascribed to the pressure. In a similar way the lines of the spectrum of water showed no signs of expansion up to twelve atmospheres; though more intense than...
Pagina 402 - If we have a sheet of conducting matter in the neighbourhood of a magnetic system, the effect of a disturbance of that system will be to induce currents in the sheet of such kind as will tend to prevent any change in the conformation of the tubes [lines] of force cutting through the sheet. This follows from Lenz's law, which itself has .been shown by Helmholtz and Thomson to be a direct consequence of the conservation of energr.
Pagina 403 - ... afforded good illustration of this kind of action with copper, zinc, tin, and lead, screens, and with different degrees of frequency of alternation. His results with iron are also very interesting : they showed, as might be expected, comparatively little augmentation of screening effect with augmentation of frequency. This is just what is to be expected from the fact that a broad enough and long enough iron plate exercises a large magneto-static screening influence; which with a thick enough...
Pagina 402 - Maxwell's statement, that a perfectly conducting sheet acts as a barrier to magnetic force,J describes an experiment in which the interposition of a large and stout plate of copper between two coils renders inaudible a sound which, without the copper screen, is heard by a telephone in circuit with one of the coils excited by electromagnetic induction from the other coil, in which an intermittent current, with sudden, sharp variations of strength, is produced by a " microphone clock
Pagina 27 - ... the difference of position of the blue band is not due to motion in the line of sight.* If future observations should show that the bright blue groups are variable, we must look, it would seem, to causes of a physical or a chemical nature. If the two bright groups, differing in position by about \ 0040, belong to different substances, or, less probably, perhaps, to different molecular conditions of the same substance, it is conceivable that one or other substance, or molecular state, may predominate...
Pagina 405 - ... end of the drum. The accompanying sections*, drawn to a scale of three-fourths full size, explain the arrangement sufficiently. A magnetic needle outside, deflected by the fixed magnet when the drum is at rest, shows a great diminution of the deflection when the drum is set to rotate. If the...
Pagina 535 - The seminal tubules are directly connected with it, ana it opens into the base of the Miillerian duct, the rest of which apparently aborts completely. Unlike most of the tissue elements, which are very large, and closely resemble those of the Amphibia, the spermatozoa are very minute, and are remarkable in possessing two vibratile flagella attached to the carrot-shaped " head." The generative organs of the female bear a striking resemblance to those of Amphibians. The oviduct corresponds to the Miillerian...