Abstract
This paper is concerned with the observations of the polarization of small diameter radio sources made in 1963 with the Parkes 210 ft telescope over the wavelength range 11-74 cm. The sources of error in making such measurements with a single dish are discussed. At the short-wave end, the main limitation is system noise, and there is some complication from a slight variation of antenna gain with polarization angle; at long wavelengths, the limitation is the fine-scale structure of the galactic polarization in the direction of the source. The latter varies greatly across the sky.

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