O'Byrne's was a very early addition to my library, over the years it has proved invaluable. The history behind the production of the work was a subject I had never really considered. Many thanks for the information Mark, what an achievement in six years.
A must have reference work O'Byrne's versatility has always appealed to me. When any spare time presents itself, I often randomly flick through the biographies. The Appendix also contains some fascinating information, which according to the preface was compiled with the help of William O'Byrne's brother:
'It would be unjust to terminate this series of grateful aknowledgements without mentioning the aid I have received from a member of my own family, my brother, Robert Henry O'Byrne, author of the 'Representative History of Great Britain and Ireland;' to whose affectionate zeal and energetic exertions I am indebted not only for the compilation of the greater part of the Appendix, but for the collection of a large portion of the details on which the work was founded.' I recently purchased a modern naval biographical publication, 'British Naval Personalities' by Mark Quinlan.
http://www.authorsonline.co.uk/book/665/British+Naval+Personalities/I find very useful.
Richard.