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My introduction to the fascinating phenomena associated with detonation waves came through appointments as an external fellow at the Department of Physics, University College of Wales, and at the Department of Mechanical Engineering, University of Leeds. Very special thanks for his accurate guidance through the large body of information on gaseous detonations are due to Professor D. H. Edwards of University College of Wales. Indeed, the onerous task of concisely enumerating the key features of unidimensional theories of detonations was undertaken by him, and Chapter 2 is based on his initial draft. When the text strays to the use of we, it is a deserved acknow- ledgement of his contribution. Again, I should like to thank Professor D. Bradley of Leeds University for his enthusiastic encouragement of my efforts at developing a model of the composition limits of detonability through a relationship between run-up distance and composition of the mixture. The text has been prepared in the context of these fellowships, and I am grateful to the Central Electricity Generating Board for its permission to accept these appointments.
Guibert of Nogent's account of the First Crusade is an important but difficult chronicle which will be welcomed in this first English translation. It is a valuable addition to Boydell & Brewer's repertoire of crusading material, and is an interesting text because it represents an attempt to produce a critical history from the eyewitness sources - the Deeds of the Franks and Fulker of Chartres' History of the Expedition to Jerusalem/I>: in the process it reveals considerable detail on Western attitudes to the First Crusade, and, through Guibert's own bias, on medieval mentalites in general. In this translation, Professor Levine has rendered the difficult and idiosyncratic Latin prose and verse into idiomatic English prose, while preserving as far as possible the constructions favoured by Guibert. In addition, he provides a brief introduction containing biographicaland bibliographical information, as well as a summary of the translation. Professor ROBERT LEVINEteaches in the Department of English, BostonUniversity.
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