The Treeby Chain Gun,
Invented by a man named T. W. Treeby in 1855, the Treeby Chain gun was an attempt to create a viable multi-shot firearm in an age when most firearms were single shot muzzleloaders. Treeby’s design utilized a circular chain of chambers that revolver around a barrel. Each one of these chambers would have had to be individually loaded with powder, bullet, and percussion cap. Cocking the trigger rotated the chain, however before firing the barrel must be rotated. This was done by twisting the lever on the left hand side of the rifle. The one cocked the rifle, rotating the barrel in place. Once accomplished the user seals the barrel back in place so that the chamber has a snug fit within the barrel. Firing without doing this process of fitting and refitting the barrel with each chamber can cause a catastrophic malfunction.
Only two Treeby Chain Guns were ever produced, and they were demonstrated to the British Army. The design was rejected for a number of reasons. First the design was too complicated to mass produce in any decent quantities. Second the process of firing each round was also too complicated a process for the average soldier in the heat of combat. The rifle lacked any form of forward grip. Lastly the Treeby Chain gun had the unfortunate problem of discharging multiple chambers with one shot, a problem common among multichamber firearms of the day.