Acknowledgements

I am very grateful, in the first place, to Dr Russell Cannon, until recently Director of the Anglo-Australian Observatory, for his support of this project throughout its history. I am also grateful to the Director of the Mount Stromlo and Siding Spring Observatories, Prof. Jeremy Mould, and the Time Allocation Committee for their continuing support, and for the privilege of extensive use of their telescope without financial cost to us. My helpers at the telescope have been numerous. Those who have given more of their time than others are John Shobbrook and Tom Cragg, both of Coonabarabran, and nineteen-year-old Samantha Beaman of Pimpama, Queensland. It is also a pleasure to thank the referees for their many helpful comments.

© Copyright Astronomical Society of Australia 1997