In a Google book entitled The Kentucky Encyclopedia compiled by John E. Kleber, there is an entry by John Kelly Ross, Jr. that describes the gun as a 150,000 pound, 6.4 inch Anderson Rifle. It was mounted on an iron carriage 180 feet above the Mississippi River and fired a 128 pound cone shaped shot (nicknmaed "lamp posts") up to three miles. It was used at the Battle of Belmont on 7 November 1861. On 11 November 1861 while being test fired it exploded and killed eleven men. It was named Lady Polk in honor of Confederate major general and Episcopal minister Leonidas Polk's wife.

Keith