Abstract
SINCE mid-1965 the linear polarizations of the stronger extragalactic variable radio sources have been monitored at 8 GHz using the University of Michigan 85-foot paraboloid equipped with a rotating, linearly polarized feed horn. Strong thermal and non-thermal sources were measured each observing day to determine the stability of the instrumental polarization. Five sources, 3C 120, 3C 273, 30 279, 3C 345 and 3C 454.3, have exhibited significant changes in polarization, and three sources, 3C 84, NRAO 150 and 3C 446, are suspected of having variable polarizations. Preliminary observational results for several of these sources have been reported previously1–2.
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