Philosophical MagazineTaylor & Francis., 1920 - Physics |
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Common terms and phrases
æther angle atmosphere atomic axis of sight B₁ B₂ bands bolometer brightness cadmium calculated carbon carbon bands cent chemical constant circuit coal-gas coal-gas and air coefficient corresponding cos² curves cylinder deflexion density determined diamagnetic diameter electric field electron emission energy equation error experimental experiments expression fluorite foreground space formula furnace gaseous mixture gases give given graphite graphite plate heating current hydrogen induction J. J. Thomson k₁ latent heat light lines liquid magnetic field magnetic susceptibility maximum mean measuring tube method molecular molecules nitrogen nucleus observed obtained orbits oxygen paper particles Phil Phys plane position Prof quartz ratio red fringe reflexion refraction SCALE READING shown sin² spectrum surface susceptibility temperature term theory thermelectronic current tube-furnace vapour pressure veiling glare velocity visibility wave-length zero
Popular passages
Page 342 - In the central hill-country the terraced hills show the relation of the scenery to the underlying rock, but their general sculpture is regarded as belonging to a former period of great precipitation. In arid country, where the underlying rock is laid bare, the aeroplane camera often shows the general geological structure of the district. The lacustrine deposits of the Jordan Valley and their weathering was shown, and also the form of the drainage-channels running down into the main valley. The depression...
Page 535 - ... relation could be tested with some exactness. Two sets of accumulators were selected, each giving very nearly the same potential of about 250 volts. The potentials were then made exactly equal by means of a subsidiary cell and a current-divider, the equality being tested to well within 1 in 1000 by means of a null instrument.
Page 536 - Such coincidences cannot be detected on the same spectrum photographically; but if we first add and then subtract a small potential from one of the large potentials, two lines will be obtained which closely bracket the third. To take an actual instance...
Page 528 - The upper surface is a thick brass plate, which can be raised to the desired potential, 200-500 volts, by means of a set of small storage-cells. In order to have the plates as near together as possible, they are sloped at 1 in 20 — ie half the angle of slope of the mean ray of the part of the spectrum which is to be selected by the diaphragms. Of these there are two : one...
Page 553 - The modern theory of the molecule is destructive of the obviousness of the prejudgment in favour of the traditional concepts of ultimate material at an instant. Consider a molecule of iron. It is composed of a central core of positive electricity surrounded by annular clusters of electrons, composed of negative electricity and rotating round the core. No single characteristic property of iron as such can be manifested at an instant. Instantaneously there is simply a distribution of electricity and...
Page 539 - In conclusion the author wishes to express his indebtedness to the Government Grant Committee of the Royal Society for defraying the cost of .some of the apparatus employed.
Page 585 - The object of this paper is to endeavour to supply a method of representing in terms of physical conceptions the processes occurring in physical phenomena. It is an attempt to help those who like to supplement a purely analytical treatment of physical problems by one which enables them to visualise physical processes as the working of a model, who like in short to reason by means of images as well as by symbols.
Page 527 - Gaede mercury pump through a similar tube on the opposite side. The reason for this arrangement is that the space behind the cathode is the only part of the discharge bulb in which the gas is not raised to an extremely high potential. If the inlet or outlet is anywhere in front of the cathode, failing special guards, the discharge is certain to strike to the pump or the gas reservoir. Such special guards have been made in the past by means of dummy cathodes in the bore of the tubes, but, notwithstanding...
Page 76 - S being the area. Illumination is measured by a special type of photometer, usually referred to as a lumeter or illummometer, this being calibrated to read directly in some suitable illumination units. The coefficient of reflection or total reflecting power of a surface is defined as the ratio of the total reflected luminous flux to the total incident luminous flux. In most practical work this value is not of great importance, the value desired being that of the reflecting power of the surface measured...
Page 418 - WATTS' DICTIONARY OF CHEMISTRY. Revised and entirely Rewritten by H. FORSTER MORLEY, MA, D.Sc., Fellow of, and lately Assistant Professor of Chemistry in, University College, London ; and MM PATTISON MUIR, MA, FRSE, Fellow, and Praelector in Chemistry, of Gonville and Caius College, Cambridge.