History:  Captain Thomas Rodman, responsible for increasing and improving endurance of heavy ordinance, changed the current foundry methods for casting large hollow cylinders. He revived a long abandoned hollow casting method with a critical difference. Captain Rodman substituted a patented "core-barrel" cooled inside by air or water. His idea was to freeze molten metal from its bore outward, pushing impurities toward the exterior. He understood that casting as an outward succession of thin concentric rings that in turn while cooling would solidify and then shrink. The shrinkage would compress those already cooler within, producing compression stresses to oppose firing pressures. Today, this technique is known as pre-stressing. The 10-Inch Rodman gun (Pattern 1861) weight was 15,050 pounds; had zero preponderance. Confederate Columbiad's copied Rodman's construction. 

The Model: This model is a perfect 1/32 scale replica of the original, matched in every detail. It is museum quality and is guaranteed to satisify even the most demanding collector. 

Product SKU: OSN-1-3