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1. Book reviews ? Second International Conference on Hydrocyclones. Cranfield (Bedford, MK43 OAT, England), BHRA Fluid Engineering Centre, 1984. £33. Reviewer: R.P. King This volume contains the 28 papers presented at the Second International Conference on Hydrocyclones, which was held in Bath (England) in September 1984. The format and presentation of the papers are similar to those of the first volume in the series, and this volume con¬tinues the series as an authoritative account of much of the research work associated with hydrocyclones that is being undertaken throughout the world. The volume was produced from camera-ready copy supplied by the authors, but the quality of reproduction is very high and both text and figures are legible throughout the volume. Although most of the work reported deals with the hydrocyclone as a classification device, important sections are devoted to liquid-liquid separations and heavy¬medium separations.