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- W4237946116 abstract "LONDON. Physical Society, Feb. 6.E. B. Moss: A ballistic recorder for small electric currents. The standard thread recorder is so modified that it records ballistic throws in instead of the usual steady deflection. By this means, the current-sensitivity may be increased at least twenty-five times.F. J. Scrase: The instrumental phase-difference of seismograph records: an illustration of the properties of damped oscillatory systems. A discussion is given of the method of interpretation of the maxima shown on the records of earthquakes during the surface-wave phase. The usual procedure is to treat the waves (which actually appear as beats) as being truly simple harmonic. In genera], this procedure does not necessarily lead to the correct interpretation. In direct registration, the true earth maximum may have occurred one half-period later than the time obtained by the usual correction. With galvanometric registration, the maximum may have occurred either one, two, or three half-periods earlier than the time indicated by the usual formula due to Galitzin. For direct registration, the phase correction at present in use appears to be as good as one of the alternatives. For galvanometric registration, the correction suggested by Somville, which is one half-period less than Galitzin's, should be adopted.H. E. Beckett: The reflecting powers of rough surfaces at solar wave-lengths. A hemispherical mirror was used for integrating diffusely-reflected energy upon a thermopile receiver. The paper deals at length with the errors inherent in the method and with the adjustment of the apparatus. The theory of the method is simplified by the introduction of an auxiliary specimen which, in particular, renders the observations independent of the degree of blackness of the thermopile receiver." @default.
- W4237946116 created "2022-05-12" @default.
- W4237946116 date "1931-03-01" @default.
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- W4237946116 title "Societies and Academies" @default.
- W4237946116 doi "https://doi.org/10.1038/127504b0" @default.
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