spool cannon

Noun

 * 1) A child's homemade toy made by attaching an elastic band to a cotton reel to form a slingshot that could shoot a pencil or other slim object through the bore of the reel.
 * 2) * The Adventures of Tom Sawyer, by Mark Twain. Ch.2
 * He had besides the things before mentioned, twelve marbles, part of a jews-harp, a piece of blue bottle-glass to look through, a spool cannon, a key that wouldn't unlock anything,