US Army 10-Inch Seacoast Mortar, Pattern 1861 in St. Augustine, Florida

US Army 10-Inch Seacoast Mortar, Pattern 1861, displayed in St. Augustine, Florida. Manufactured by Cyrus Alger & Co. in 1862, this is one of only eight of the type made - of which two survive. It strongly resembles its 13-Inch “big brother” but weighs only 7,640 pounds verses around 17,000 pounds for the 13-inch. It is considerably larger than the 10-Inch Siege Mortar, Pattern 1861 which weighed slightly less than 2,000 pounds.