Not long after, the eunuch Liu Chengzhi, the eunuch in charge of the military battle, rushed in and greeted him happily, making Emperor Chongzhen not ask, but it must be a good thing.

Sure enough, after the ceremony, I heard Liu Chengzhi say: "Your Majesty, the performance of the cannons cast in the military battle situation has more than doubled!"

After the iron mold casting gun was successfully successfully, the speed of the casting gun was only increased, and there was no improvement in performance. The general reason is that the iron mold casting guns are mostly white iron cannons.

If this kind of artillery fires quickly, the temperature will be too fast and cannot cool down quickly. Therefore, every three artillery will have to cool for a long time and have a limited service life. In actual battlefields, this defect is easily fatal.

But at this time, it is only used for training in the New Army artillery battalion, so it is not necessary to pay so much attention. If you use it almost, you don’t need to let the military battle be restored and use the new gun. Compared with the previous mud mold casting gun, this usage is within the scope of tolerance.

But the New Army Artillery Battalion must go to the battlefield, which requires the performance of the artillery to be improved. Before, Emperor Chongzhen asked them to improve the performance of the artillery when he inspected the military battle.

Emperor Chongzhen did not expect that in less than two months, the military battle situation had more than doubled its performance. He couldn't help but be very excited and immediately ordered the military battle situation to go and see it on the spot.

Liu Chengzhi was naturally happy and made achievements, hoping that the emperor could go to the scene to see it. After the war situation, he immediately diligently led Emperor Chongzhen to the cannon casting hall.

Just like last time, there were many cannons in the courtyard of the cannons. Liu Chengzhi pointed to the cannons and introduced them to Emperor Chongzhen one by one.

There are both old and new artillery, and through comparison, Emperor Chongzhen has an intuitive impression. Then Liu Chengzhi can introduce methods to improve performance. In fact, there are only a few aspects: one is annealing treatment, which improves the quality of the artillery; the other is to improve from the molten iron to further the quality.

Emperor Chongzhen was excited when he heard this, so he walked into the cannon casting hall to visit the site, but he found that there were many cannons inside, with all kinds of inclinations, and there were pools burning water on the side, which surprised Emperor Chongzhen and couldn't help but ask, "What is this for?"

"I have the guidance of Your Majesty. I am following the saint's will and let many craftsmen think more and do more experiments." Liu Chengzhi introduced with a hint of slightness. "The performance of the cannon is not good, because the iron mold cooling speed is too fast, and the internal and external cooling speeds are different. After I further ponder, the biggest problem should be because the inside and outside cooling speeds are too fast, so I think of a way to slow down the cooling speed in the cannon chamber. But I don't know how slow it is, so I think of a way to try one by one."

When Emperor Chongzhen heard this, he couldn't help but nodded, but he also knew that the summary of the reasons was definitely not what Liu Chengzhi thought of himself. So he stared at Liu Chengzhi and asked, "Is this what you thought of?"

When Liu Chengzhi heard the emperor ask this, he didn't dare to say anything, otherwise it would be the crime of deceiving the king. He immediately replied: "It was a way to get under the leadership of his servants and work together!"

Emperor Chongzhen nodded and said, "Your leadership's achievements cannot be eliminated. But you must remember the method proposed by a craftsman and report it to me. This will be the same in the future. Whoever proposes the ideas, if feasible, will you let anyone take responsibility. In the end, if there is success, he will make contributions and you will make contributions. Only in this way can they truly mobilize their enthusiasm and let them come up with more ideas. Your leadership's achievements will be greater, and I can also be assured that you will always be in charge of such an important military battle. Do you understand?"

This made Liu Chengzhi feel sweat faintly on his forehead, and he couldn't help but nod and replied: "Your Majesty, I understand!"

When the craftsmen not far away heard these conversations, they looked at each other, and their faces were filled with surprises.

In fact, it is not only this time. Even in the future, even if civilization and technology are ahead and developed, as long as it is a human society, there will be such a situation and leaders occupy their subordinates’ credit.

How could Emperor Chongzhen not know this? He was in a good mood at this time, so he just gave some advice and warned Liu Chengzhi in advance.

After he asked again, the craftsman Li Junfeng came over to see him. This was the method he came up with. After hearing his explanation, Emperor Chongzhen understood the principle he had thought of.

The general saying is: Li Junfeng believes that after the inner layer of the gun bore is cooled and fixed, when the outer layer gradually cools, due to thermal expansion and contraction, when the outer layer of the gun barrel cools, it will clamp the inner layer and generate an inward stress inside. Of course, there is a problem of cooling speed here. If it reaches an ideal state, the performance of the gun can be greatly improved.

The method he thought of was based on this idea, which was to change the inner mold to hollow, and then add hot water of various temperatures to make the cooling speed of the inner wall of the barrel at various different rates, so as to find the most appropriate cooling speed and achieve the best performance of the artillery. This idea has just begun to be implemented and no results have been made.

Emperor Chongzhen kept nodding when he heard it. This theory was good at first, and then used to guide the reality. It should be a good experimental method. Thinking of this, he immediately praised: "It's good, it's worth trying!"

He didn't know that Li Junfeng's method was a very similar to another plane. In 1860, US Army Major Thomastin Rodman invented the hollow casting process, that is, casting cannons around the core and then cooling them with running water. This is a method to harden the inside of the cannon chamber first, referred to as the Rodman casting cannon method.

Of course, this kind of gun casting method cannot be achieved if it is based on the mud mold casting method. Only after the iron mold casting can such a natural development can occur.

Compared with Rodman in that plane, the military battle situation at this time was rich and powerful, with enough manpower and material resources, and could be carried out in multiple experiments. Moreover, the rich experience accumulated by many craftsmen in casting cannons is not comparable to Rodman.

Emperor Chongzhen praised Li Junfeng again and asked other craftsmen to learn from him, and to think more. He had reason to believe that as long as the creative enthusiasm of the Ming craftsmen was stimulated, there would definitely be unexpected gains. Chinese people have never been fools!

After returning from the inspection of the Military War Bureau, Emperor Chongzhen immediately issued an order to the new military advisor Cao Huachun, telling him the good news, and preparing to change the new army artillery battalion and conduct a new round of training.

After finishing all this, Emperor Chongzhen's eyes turned to Guihua City again.

Thanks to Tianwaitian 007 for the reward! I went home from get off work the day before yesterday and took cold medicine, but I couldn’t write all night. I went to attend the annual meeting yesterday and came home very late. I only got one chapter early. I only coded this chapter this morning now, and it’s updated a little late.
Chapter completed!