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The ferromagnetic property of iron has made possible a simple measurement of the polarization of resonance radiation from the level in Fe 57 at 14 kev and a direct observation of a strong correlation in direction between the magnetization in a ferromagnetic domain and the internal magnetic field at the nucleus. Recent observations have shown 1 " 4 that the 14-kev radiation undergoes a strong absorption of the Mossbauer type 5 at room temperature and that the absorption spectrum displays 2 a hyperfine structure corresponding to the splitting of the 14-kev level by the internal field. The present experiment consists in observing the resonant absorption with a ferromagnetic source and absorber magnetized parallel or perpendicular to each other.The apparatus is shown schematically in Fig. 1. On one side of the alnico magnet M is fastened the yoke structure designated by F. The pole pieces P bridge the circular gap formed by the yoke, and the source S is mounted in the gap between the pole pieces. An identical structure for providing a magnetic field in the absorber A is mounted on the other side of the same magnet M. The design allows the pole pieces P and P' (shown also in side view in Fig. 1) to be rotated relative to each other so that the relative orien-

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