Iron Artillery Worm

 

This is an example of an iton artillery worm.  A tool like this would typically be fixed the end of a wooden pole, then stuck into the barrel of an artillery piece to help free and clear any remnants from previous shots.  For source and more details, click here.

 

Image from: http://www.nps.gov/history/museum/exhibits/revwar/image_gal/vafoimg/frameshell.html