"Field Artillery of the Principal European States", The United service magazine, Vols. 59 & 60 (1849). London: H. Colburn, 1849:

http://books.google.com/books?id=ltwRAAAAYAAJ&pg=PA170

http://books.google.com/books?id=M4YaWcXb1IEC&pg=PA1

http://books.google.com/books?id=M4YaWcXb1IEC&pg=PA196

http://books.google.com/books?id=M4YaWcXb1IEC&pg=PA429

Although the discussion is post Nappy, there is much of interest and possible use.