We should like to thank all who have contributed to the development of this text, especially the many
instrument manufacturers who generously provided examples and illustrations, and in particular Perkin
Elmer Ltd. (UK) and Sherwood Scientific Ltd. (UK). We would like also to thank our colleagues who
allowed us to consult them freely and, not least, the many generations of our students who found
questions and problems where we had thought there were none!
DK
PJH
x Preface