Chapter 651: Golden Supply Box (Part Two)

"We won't consider the self-tightening and silk-winding techniques for now." These two technologies, to put it simply, allow the outer layer of the artillery to shrink inward, and the inner layer of the artillery to expand outward. Relying on the structural changes of the metal itself to compact the barrel, a cannon with a longer range, greater power, and more durability can be created. But, it's completely unnecessary. Because the Night Leader didn't even have black powder, he had to wait for himself to get the raw materials before he could grind it out.

"It's decided. The idea of hollow castings can be used to cast double-layered iron cannons." Field knocked on his head.

"Fortunately, I had nothing to do before. I liked to quarrel with the old man in the forum and checked a lot of knowledge that seemed useless." The so-called double-layer iron cannon is an inner cannon forged from wrought iron, and the outer layer is cast from ordinary cast iron or bronze. The advantages are: durable, high success rate, and can also be wholesaled. The biggest disadvantage is: huge weight.