The London, Edinburgh and Dublin Philosophical Magazine and Journal of ScienceTaylor & Francis, 1920 - English periodicals |
Contents
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Common terms and phrases
æther anemometer angle atmosphere atomic axis B₁ B₂ bands beam brightness cadmium calculated carbon carbon bands carbon dioxide cent circuit constant corresponding curve cylinder deflexion density determined diamagnetic diameter difference displacement effect electric field electron emission emitted energy equal equation error experimental experiments expression fluorite formula frequency furnace gases given gives graphite graphite plate gravitational heating current helium Hence hydrogen intensity ionization J. J. Thomson k₁ light lines luminous vapour magnetic field magnetic susceptibility mass means measuring tube mercury method mixture molecules motion nitrogen object observed obtained oxygen paper paramagnetic particles Phil plane position pressure radiation ratio red fringe relative rotation saturation shown shows solution space spectrum surface susceptibility temperature term theory thermelectronic current tube-furnace velocity visibility volts volume wave-length wire zero
Popular passages
Page 612 - K2, which is mounted in the bore of a carefully ground stopcock L. The function of the first diaphragm is to prevent any possibility of charged rays striking the greasy surface of the plug of the stopcock when the latter is in any working position. The variable diaphragm is in effect two square apertures sliding past each other as the plug of the stopcock is turned, the fact that they are not in the same plane being irrelevant. When the stopcock is fully open as sketched in Fig.
Page 614 - Z serve to protect the rays completely from any stray electric field, even that caused by the photographic plate itself becoming charged, until within a few millimetres of their point of impact. The photographic plate W, which is a 2 cm. strip cut lengthwise from a 5 x 4 plate, is supported at its ends on two narrow transverse rails which raise it just clear of the plate X, X. Normally it lies to the right of the slot as indicated, -and to make an exposure it is moved parallel to itself over the...
Page 614 - Jj is earthed to prevent any rays reaching the camera when the plate is moved over the slot to its first position, which is judged by inspection through P with a nonactinic lamp. The magnet current having been set to the particular value desired and the diaphragm adjusted, the coil is momentarily...
Page 614 - I2 are then cut off from the pump by stopcocks and immersed in liquid air for an hour or so. The electric field, which may range from 200 to 500 volts, is then applied and a small current passed through the magnet sufficient to bring the bright hydrogen molecule spot onto the willemite screen Y, where Fio. 4. — The camera. it can be inspected through the plate-glass back of the cap P.
Page 619 - The determination of masses so far removed as these from the reference lines offers peculiar difficulties, but as the lines were expected to approximate to the terms of the geometrical progression 1, 2, 4, 8, etc., the higher terms of which are known, a special method was adopted by which a two to one 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...
Page 357 - ... convenient source of energy for operation is the ordinary no- volt lighting circuit, on which it will operate continuously with a current as small as 3 amperes and a drop of 14 volts across the terminals of the lamp. However, the most satisfactory results are secured with a current of about 7 amperes and a drop across the terminals of about 25 volts. Under this condition a practically pure cadmium spectrum of great brilliancy is obtained. The intensity secured is apparently equal to that which...
Page 613 - When the latter is built into position, the pole pieces are drawn by screwed bolts into the arms of the magnet and so form a structure of great weight and rigidity and provide an admirable foundation for the whole apparatus. Current for the magnet is provided by a special set of large accumulators. The hydrogen lines are brought...
Page 356 - Subsequently, it was discovered that upon distilling the cadmium from the alloy at a pressure of about 0.001 mm of mercury, the minute quantity of gallium carried over was sufficient to change completely the character of the cadmium and to prevent adhesion between the cadmium and the walls of the lamp.
Page 613 - The plates Z, Z serve to protect the rays completely from any stray electric field, even that caused by the photographic plate itself becoming charged, until within a few millimetres of their point of impact. The photographic plate W, which is a 2 cm. strip cut lengthwise from a 5 x 4 plate, is supported at its ends on two narrow transverse rails which raise it just clear of the plate X, X. Normally it lies to the right of the slot as indicated, and to make an exposure it is moved parallel to itself...
Page 354 - ... Another possible source experimented with is the quartzcadmium vapor arc lamp, described by Lowry and Abram.' This lamp is always unsatisfactory, owing to two defects. It is necessary to have it permanently connected to an air pump and to immerse the electrodes in water. If the cadmium in a vapor lamp is sufficiently pure, the adhesion between the cadmium and the quartz results in the destruction of the lamp upon the solidification of the cadmium. An improved form of lamp has been brought out...