This video is pretty fascinating to me. The Girandoni Air Rifle was used as early as the 1700's in battle and carried by Lewis and Clark across the great plains. I had no idea that they were capable of producing such a gun in the 1700's.
http://www.youtube.com/watch?v=oPZ6DLHVa2c
How it worked
http://www.youtube.com/watch?v=5fRu5tYH-4Q
http://www.youtube.com/watch?v=oPZ6DLHVa2c
How it worked
http://www.youtube.com/watch?v=5fRu5tYH-4Q

Comment