Upvote:5
Here are some French artillery of Napoleonic armies technical drawings and photos. The site is in Russian but the drawings are copied from some French originals. Inscriptions on drawings are in French. The Russians have a huge collection of them (captured in 1812-15) on display in Kremlin.
http://wars175x.narod.ru/fr_art01.html
http://wars175x.narod.ru/fr_art02.html
Here is a book on British artillery of Napoleonic times:
http://vive.moy.su/shop/478/desc/british-napoleonic-field-artillery
And an article with some technical drawings and further references:
http://www.napoleon-series.org/military/Warof1812/2009/Issue12/c_Artillery.html
Here is a Russian book on 1812 artillery (Russian and French). It has few technical drawings (some of them copies of the French ones, others made by the author, many photos, and a lot of various technical data: