Reminds me of the coffee mill gun of the Civil War. It used a similar steel "cartridge". Wonder if the inventor got the idea from Treeby's patent?The great majority of early firearms were single shot. There were many attempts from the earliest times to produce a gun that could be loaded and then fired many times before it needed to be reloaded. This design was patented in July 1855 by TW Treeby. A number of steel tubes were formed into an endless chain. Each was loaded with powder and ball and a percussion cap placed on the nipple at the rear. When the lever is turned the chain of chambers is released and can be turned by hand.