| Description |
English: The Great Floyd Gun, cast at the Fort Pitt Foundry, Pittsburg, Pa., on the 18th of January, 1860—the largest piece of ordnance in the world
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| Date | |
| Source | Frank Leslie’s Illustrated Newspaper, Febrary 25, 1860 (https://archive.org/stream/franklesliesillu00lesl#page/n118/mode/1up) |
| Author | Unknown engraver |