Science Abstracts: Physics. Section A, Volumen16E. & F.N. Spon, 1913 |
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a-particles absorption Abstract Akad alloys alternating current anode apparatus atmosphere atomic weight atoms bands calculated canal rays carbon cementite charge chemical chloride coefficient Comptes Rendus constant copper crystal curve density determined diam discharge Doppler-effect effect electric electrolyte electrometer electrons emission energy equation experimental experiments formula galvanometer gases Gesell given glass Hall-effect heat helium hydrogen increase intensity investigation ionisation ions iron J. J. Thomson Journ layer light lines liquid magnetic field measured mercury metal method molecular molecules negative nitrogen observed obtained oscillation oxygen paper particles Phil photographic Phys Physik plane plate polarisation potential pressure Proc produced quartz radiation radio-active Radium refraction refractive index resistance rotation Sept shown solar solution spectra spectrum steel substances surface temperature theory tion tube vapour variation velocity viscosity volts wave-length wire Wiss X-rays y-rays Zeitschr
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Página 114 - ... happen, however, that we have some independent knowledge of the form of </>. For example, we may know that the medium is composed of strata each uniform in itself, so that within each <f> vanishes. Further, we may know that there are only two kinds of strata, occurring alternately. The value of f<f>dx at each transition is then numerically the same but affected with signs alternately opposite. This is the case of chlorate of potash crystals in which occur repeated twinnings*. Information of this...
Página 555 - F and E are the complete elliptic integrals of the first and second kind, respectively, to modulus k.
Página 418 - ... radiations in air. (2) The absorption of homogeneous radiation in a gas is proportional to the pressure of that gas. (3) For the homogeneous rays emitted by metals of atomic weight ranging from that of iron to that of molybdenum, the coefficient of absorption -in the gases investigated is approximately inversely proportional to the fifth power of the atomic weight of the radiator which emits that characteristic radiation, ie \ oc w~8.
Página 205 - X is the number of seconds between the time -when the bath attains any given temperature and the time when the thermometer indicates this temperature. In other words, it is the number of seconds the thermometer "lags
Página 149 - ... sensitiveness of the manometer. The sensitiveness in our instrument with this arrangement was about three times that of the Reichsanstalt. (3) The expansion of the bulb material was determined with great care and is probably accurate within 0.5 per cent. (4) The unheated space between the bulb and manometer has been reduced until the total correction in this hitherto uncertain region amounts to less than 4° at 1100°.
Página 591 - Moseley and Darwin,* and we have verified it in the case of aluminium. Since the reflection angle of each set of rays is so sharply defined, the waves must occur in trains of great length. A succession of irregularly spaced pulses could not give the observed effect. In the application of electromagnetic theory to monochromatic light on the one hand, and to homogeneous X-rays on the other, there is no difference to be considered beyond that of wave-length. These results do not really affect the use...
Página 517 - ... which makes no appeal to organs of sense, and no ready response to laboratory experiment. Against these tendencies the author contends. He urges a belief in ultimate continuity as essential to science ; he regards scientific concentration as an inadequate basis for philosophic generalisation ; he believes that obscure phenomena may be expressed simply if properly faced ; and he points out that the non-appearance of anything perfectly uniform and omnipresent is only what should be expected, and...
Página 349 - ... a-particle is expelled by a radio-element the group in the periodic system, to which the resultant product belongs, is either two units greater, or two units less, than that to which the parent body belongs. "2. Whenever a...
Página 11 - POSTULATE R. The velocity of light in free space, measured on an unaccelerated system of reference S by means of units belonging to S, is independent of the velocity of S and of the unaccelerated velocity of the light-source.
Página 491 - April 25 and 26, 1913. tends to cause a "drift" as was found by Moll,1 and more recently by the writer. The "cold" junctions should be covered with receivers having the same size and emissivity as the "hot" junctions and they should be free in the air so that there will be no drift with the variation in temperature which is caused by the incident radiation. In the Hilger thermopile which embodies the Johansen principles, the "cold...