I gather those are the Tredegar versions of the Rodman guns that weren't cast using the Rodman wet chill process.
That's right, George; some wrongly refer to these guns as Confederate Rodmans, but the Rodman water cooling process was not employed in making them, they were cast solid then bored, just like in the old method of manufacturing cast iron cannons. The only features they had in commom with Rodman's guns, were the similar profile, and the large "button" cascabel, but even in their outward appearances there were differences: The Southern guns didn't have the same graceful line from muzzle face to breech that the Rodmans had, and they weren't lathe turned to finish the surface, but left in a rough state. The trunnions were also longer, because the South was mounting them on wooden barbette carriages, not the thin cheeked iron carriages that the Union was using.
The Anderson referred to in the article is Joseph R. Anderson who ran the Tredegar foundry, and he was also a CSA General. I don't know if it's true that it was his idea to turn these Columbiads into smaller bored rifles, in the hope that the thicker walled rifles would be less prone to blowing into pieces upon firing, but whoever's idea it was; it evidently didn't work.
