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Published online by Cambridge University Press: 23 November 2009
This paper is the sixth chapter of a series on the history of air navigation systems which have appeared from time to time in the pages of the Journal since 1988. Part II of this chapter will appear in the next issue of the Journal.
The author acknowledges the assistance of Bath College of Higher Education and, in particular, Dr Terence Rodgers, The Royal Aeronautical Society, The Royal Air Force Museum, and Philip Saxon of the Royal Air Force Historical Society.