Statistics for occurrence #1 of “Colonel Rodman” in chapter 8 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 5: Forts and Artillery.:
... material, and proved entirely satisfactory until the adoption of the rifled systems.
The American smooth-bore type of Ordnance was the best in the world.
In 1860, the Ordnance Department adopted Colonel Rodman 's method of interior cooling of a hollow cast tube, and in 1863 the extreme effort was made to produce a heavy gun, resulting in a successful 20-inch smooth-bore throwing a shot weighing 1080 pounds....
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