Civil War Cannon - Carmi, IL
Posted by: 
YoSam.
N 38° 05.438 W 088° 09.534
16S E 398375 N 4216505
For some reason outside the side walk - but part of the city block memorial park.
Waymark Code: WMKHQA
Location: Illinois, United States
Date Posted: 04/18/2014
Views: 2
County of display: White County
Location of display: Main St. (IL 14) & S. Main Cross St., Veterans Memorial Park, Carmi
No plaque so guessing on type
"The 4.5-inch siege rifle looks like a larger version of the 3-inch ordnance rifle and it is often called a 4.5-ordnance rifle. However, the 4.5-inch Siege rifle was of conventional cast iron construction and did not use the welded wrought iron construction of the 3-inch ordnance rifle. The 4.5-inch siege rifle fired shells weighing about 30 pounds (depending on the specific type of shell). It weighed 3,450 pounds and was 133 inches long. The gun’s only vice was that it suffered from excessive erosion of the vent caused by the hot gasses flowing through the vent when the gun was fired. The vent could be too large to fire the gun after 400 discharges (Abbot 1867, p. 89). This problem could be remedied by insertion of a copper vent piece (bouche).
"In addition to its use as siege artillery, two batteries of 4.5- siege rifles (8 guns total) accompanied the Army of the Potomac as “heavy” field artillery between 1862 and 1864. The big guns were intended for long range firing against Confederate artillery. Although the guns showed very good mobility, they saw little action "
~ Wikipedia
For statistics etc you can get it all here