H. D. HARRADON, Department of Terrestrial Magnetism, Carnegie Institution of Washington, has given a short account of this subject (Sky and Telescope, 1, 8 ; June, 1942), commencing with the discovery ...
IN 1951, Ryle and Elsmore 1 reported on a series of observations of radio sources using an interferometer at a frequency of 81.5 Mc./s. A comparison of the flux densities of about one hundred sources ...
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