Acknowledgements

We thank Ann Burgess for providing us with unpublished ATCA images of several sources and for supplying us with her improved meridian-distance gain curve. We also thank Duncan Campbell-Wilson, Lawrence Cram, Jean-Pierre Macquart, Gordon Robertson, Mark Walker and Taisheng Ye for useful discussions and advice, and an anonymous referee for a careful reading of the manuscript. This research has made use of the NASA/IPAC Extragalactic Database (NED), operated by JPL under contract with NASA. The MOST is supported by grants from the Australian Research Council, the University of Sydney Research Grants Committee, and the Science Foundation for Physics within the University of Sydney. BMG acknowledges the support of an Australian Postgraduate Award and of NASA through Hubble Fellowship grant HF-01107.01-98A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA under contract NAS 5-26555.

© Copyright Astronomical Society of Australia 1997