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In the present paper some experimental arrangements are shown which utilize the magnetic filter described by Cimino et al. (1968). For a single cell we have elaborated an elementary theory in the following cases: (i) absorption by an atomic beam in a uniform magnetic field (i.e. pure damping profile); (ii) atomic beam in a non-uniform magnetic field; (iii) vapours in a uniform magnetic field (i.e. gaussian distribution); (iv) vapours in a non-uniform magnetic field. [ABSTRACT FROM AUTHOR]

Using the atomic-beam technique in absorption, a new kind of very narrow-passband filter is obtained, which may also be used as a high-resolution spectrograph and as a 'Babcock window' for detecting solar magnetic fields without a spectrograph. [ABSTRACT FROM AUTHOR]