""Swivel Guns"

http://www.youtube.com/watch?v=CkogmqJzXmI

"USNA Museum Ordnance Collection"

http://www.youtube.com/watch?v=Jvq3Zc_kmLI

Bellona Arsenal (Richmond VA) and Rare Cannon Flask

http://www.youtube.com/watch?v=8FwtlAbziHE