A search has been made for circular polarization in ten compact radio sources at a wavelength of 2.2 cm. Marginal detections were obtained from two sources: 3C273 and 3C345. A new polarization feed which permitted simultaneous measurements of all four Stokes parameters is briefly described. The results are dis- cussed with reference to the radiation mechanism.
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Seaquist et al. (1974) studied this question.