I have seen pictures of that one elsewhere, though I can't recall when or where. I recommend the excellent book Firearms Curiosaby Lewis Winant, he covers many oddities such as this one.
"This is Joseph Enouy’s invention, British patent #1359, dated 1855. It appears in Winant’s ‘Firearms Curiosa’ and Blair’s ‘Firearms of the World’. At that time it seems to have been in private hands – clearly now it’s in (or on loan to) a museum collection – not sure where though. Google Books has some nice contemporary reports of its invention at this link"...