Originally this book was conceived as a joint work, in co-authorship with Mr. L. C. Bull. Unfortunately, owing to other commitments, he was compelled largely to forego his interest. However, Chapters 9 and 14 (on the fundamentals of vapour-compression and vapour- absorption refrigeration) are entirely his work. The author wishes to make this special acknowledgement to Mr. Bull for writing these chapters and also to thank him for his continued interest, advice and encouragement. Sadly, Mr. Bull is now deceased.

The helpful comment of Mr. E. Woodcock is also appreciated.

The author is also indebted to Mr. D. J. Newson for his contribution and comment.

The author is additionally grateful to the following for giving their kind permission to reproduce copyright material which appears in the text.

The Chartered Institution of Building Services Engineers for Figures 5.4 and 7.16, and for Tables 5.3, 5.4, 7.2, 7.7, 7.13, 7.14, 7.18, 16.1 and 16.2 from the CIBSE Guide.

H. M. Stationery Office for equation (4.1) from War Memorandum No. 17, Environmental Warmth and its Measurement, by T. Bedford.

Haden Young Ltd. for Tables 7.9 and 7.10.

The American Society of Heating, Refrigeration and Air Conditioning Engineers for Tables 7.5, 9.1, 9.2 and for Figure 12.12.

John Wiley & Sons Inc., New York, for Figure 13.8 from Automatic Process Control by D. R Eckman.

McGraw-Hill Book Company for Table 7.12.

American Air Filter Ltd. (Snyder General) for Table 9.6.

Woods of Colchester Ltd. for Figure 15.23.

W. B. Gosney and O. Fabris for Tables 9.3 and 9.4.

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