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I hope this book will be useful to at least two groups of individuals: the nonspecialist reader with a general knowledge of solid-state science and seeking an introduction to the theory and practice of the Hall effect in metals, and the specialist seeking a contemporary review of the relevant literature.

This work was begun quite some time ago at the University of Oxford during the tenure of an Overseas Scholarship of the Royal Commission for the Exhibition of 1851 and was completed at Banga lore when the author was being supported by a maintenance allowance from the CSIR Pool for unemployed scientists.

The purposes of this book are to provide insight and to draw attention to problems peculiar to heat transfer at low temperatures. This does not imply that the theories of classical heat transfer fail at low temperatures, but rather that many of the approximations employed in standard solutions techniques are not valid in this regime.

* Electron optics involves the influence of electric and magnetic fields on electron beams. nonsuperconducting, electron optical parts, is worth considering if the outstanding magnetic properties of superconductors can improve the systems.

This book is meant for laboratory workers who for one reason or another have a need to cool something down to temperatures below that of liquid nitrogen - notably to 4.

With the increased interest in superconductivity applications through out the world and the necessity of obtaining a firmer understanding of the basic concepts of superconductivity, the editors of the In ternational Cryogenics Monograph series are extremely grateful for the opportunity to add Superconducting Materials to this series.

The purposes of this book are to provide insight and to draw attention to problems peculiar to heat transfer at low temperatures. This does not imply that the theories of classical heat transfer fail at low temperatures, but rather that many of the approximations employed in standard solutions techniques are not valid in this regime.

During the past 20 years there have been amazing developments in low temperature physics, engineering, and biology. Mendelssohn, who insti gated us to produce a monograph and who reassured us that cryogenic engineers are as keen to understand the current trends in biology, and particularly in cryobiology, as we are to enlist their help.