We may soon be able to include or exclude the "fuse lighter" possibility, since there's an article on these in a magazine. I've emailed the publisher (Jim Gooding I think) to see if he can help, since I don't have a cy of the article.

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Canadian Journal of Arms Collecting:

Vol. 37, No. 4 (Nov. 1999)

Franklin, Carl E. The Congreve 12-Pdr. Rocket Cart, Limber and Harness, c. 1813. pp. 111-119.
Newland, Michael A. William Wellington Greener. pp. 120-127.
***Fulton, Alan P. The British Fuse Igniter Pistol. pp. 128-130.