Abstract
LONDON Royal Society, February 21. F. W. ASTON: The isotopic constitution and atomic weights of hafnium, thorium, rhodium, titanium, zirconium, calcium, gallium, silver, carbon, nickel, cadmium, iron and indium. Mass-spectrograph analyses both by anode rays and the ordinary discharge have been made of thirteen elements. Rays from some twenty new isotopes were discovered in all. The atomic weights estimated by the photometrical measurements of abundance are generally in good accord with the accepted ones. In the case of cadmium, success was attained in an unexpected manner and interesting observations were made on the behaviour of metallic methyls in the discharge. Work on the iso topic constitution of elements is now fairly complete. All but four, palladium, iridium, platinum and gold, have given positive results of some sort. Some 247 stable isotopes are known and one of the most astonishing facts revealed is the occurrence of a stable elementary atom for practically every natural number up to 210. J. M. STAGG: The diurnal variation of magnetic disturbances in high latitudes. For some years it has been known that irregular, short-period perturbations (‘disturbances’) in the earth's magnetic field at a few isolated localities have a daily variation in their time of incidence, but it was not known whether the variation is governed by local or universal time or how it is affected by magnetic latitude. Using the records from ten magnetic observatories in both hemispheres, it has been established that short-period irregular disturbance is controlled by local time up to the magnetic axis pole. Below magnetic latitude 70°, the variation in disturbance has a dominant single maximum in the late evening throughout the year; above 80° its phase is reversed and the transition from summer to winter conditions involves radical change both of type and scale. In the intermediate zone the incidence of disturbance varies also with season and with the state of general disturbance, both forenoon and evening maxima being conspicuous.
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Societies and Academies. Nature 135, 354–355 (1935). https://doi.org/10.1038/135354a0
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DOI: https://doi.org/10.1038/135354a0