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It reads: Electrical Phenomena that apparently are of Interstellar Origin By KARL G. JANSKY* SUMMARY. Electromagnetic waves of an unknown origin were detected during a series of experiments on atmospherics of short wave-lengths. Directional records have been taken of these waves for a period of nearly two years. The data obtained from these records show that the azimuth of the direction of arrival changes from hour to hour and from day to day in a manner that is exactly similar to the way in which the azimuth of a star changes. This fact leads to the conclusion that the direction of arrival of these waves is fixed in space; that is to say, that the source of these waves is located in some region that is stationary with respect to the stars.