Blagdon (1778-1819) was a hack writer whose splendid home-made phonetics may have contributed to the ruination of English pronunciation of French. "maysieu voahssee eune ohbairge kee ah ahsay bunn ahpahraunce." Books of this nature, presumably printed in many thousand copies, are ephemeral. Wikipedia still repeats old DNB, "possibly no copy... extant", but libraries report a handful of copies, all earlier than ours: 1st?, 3rd, 5th, 6th, 14th, 16th and 17th of the English edition, with a few printed at Paris by Galignani and a lone copy printed at Calais. The 'usual' (2 copies!) 17th edition is dated 1831, so perhaps Leigh & Co decided that number was high enough..