Abstract
(1)Some improvements on the method of measuring the change of resistance in strong magnetic fields are described.(2)The change of resistance in a transverse field at room temperature, at temperature of solid CO2 and ether and at the temperature of liquid nitrogen has been studied in the following metals: Li, Na, Cu, Ag, Au, Be, Mg, Zn, Cd, Hg, Al, Ga, In, Tl, C, Ti, Ge, Zr, Sn, Pb, Th, V, As, Sb, Bi, Ta, Cr, Mo, Te, W, Mn, Fe, M, Pd, Pt; in a gold-silver alloy and in Cu3As.(3)The change of resistance in a parallel field was measured for a few metals.(4)It was found that in all the metals the change of resistance follows the same law which can be expressed by a formula which fits the experimental results quite well. This formula gives a square law in weak fields and a linear law in stronger fields.(5)It has been shown that the physical change produced in a conductor by hardening and annealing has a strong influence on the phenomenon of change of resistance.(6)The influence of the impurities is also very marked and was studied.(7)A comparison with the results of previous experimental researches is given.(8)A theory is given for the phenomenon of change of resistance in a magnetic field which assumes that the change of resistance follows a linear law with the increasing field, and that it is masked in weak fields by disturbances existing in the metal which are equivalent to that produced by an inside magnetic field.(9)Formulae are obtained which agree with experimental facts and permit the separation of the ideal resistance and the additional resistance which is produced by internal disturbances.(10)It has been shown that the additional resistance is independent of the temperature, and that the ideal resistance has a constant value for a given temperature for each metal independent of its physical and chemical state.(11)It has been shown that the additional resistance is identical with the residual resistance which is observed close to the absolute zero.(12)It has been suggested that supra-conductivity is a general phenomenon in all metals, but that it is masked by the additional resistance which disappears at very low temperatures in certain metals.(13)The properties of the coefficient β of the linear law of the change of resistance is discussed, and it is shown that there is a certain connection between the value of β and the position of the element in the periodic system.(14)The relation of the magnitude of the change of resistance with the position of the element in the periodic system is examined.(15)The bearing of the present research on the modern theory of conductivity is discussed, and it is shown that the phenomena observed cannot be adequately explained. Some tentative suggestions are advanced in this connection.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
