Driven by the steam engine, the roar of various machinery running together, as well as the beating sound of various manual work, are constantly sounding from the back mountain......

As soon as the red-hot steel comes out of the furnace, it is quickly forged by the punching machine, quickly forged into an iron sheet, rolled into a spiral, and then enters the next program, heated again, layered together, forged, and finally formed a barrel suitable for the length of a rifle or light machine gun, and then transferred to the next step......

In the next step, the various carvings of the barrel, the rifling of the car, etc., were all taken over by their own workers.

These have been practiced when the prototype gun was built before, and all the flow is like the assembly line in the most efficient factory......

However, it is not so easy to make a barrel from a thick round shaft and finally imitate a cannon - the barrel pressure is too high, and the seamless barrel made of multiple layers of spirals like a gun cannot be carried at all......

So, you can only hollow out the middle with the entire round shaft!

The whole round shaft of steel is hollowed out, and it needs to be accurate enough, without professional machinery, it is absolutely impossible to do!

Fortunately, Zhang Ran has already made arrangements for this......

Gao Jin and others came again, and couldn't help but bring a large amount of corundum and other materials suitable for the detachment, and at the same time, they also brought lathes that could make holes in the car......

As soon as the disassembled lathe was assembled, Gai Hei Liangcheng Dongshan Cui Sanyuan and others immediately put themselves into the work excitedly, running in shifts for 24 hours, and in less than a week, the first barrel came out......

After Gai Heiliang's various data calculations, the barrel of this car can definitely be used to imitate artillery!

Although there is still a big gap between its quality and the 92-step guns of the captured little devils, it is definitely much better than the quality of those guns made by Yan Laoxi's arsenal in the past......

The artillery made by Yan Laoxi Arsenal will be reimbursed if it is fired for a few dozen rounds, but the artillery made of this barrel will have no problem at all if it hits one or two hundred rounds!

Some people may think that it is really worth the loss to spend a huge price to make an artillery piece and reimburse it for one or two hundred rounds......

But for the Eighth Route Army, the difference is simply equivalent to two people, one is a single, and the other is a daughter-in-law, although it is ugly, but there is a difference between daughter-in-law and daughter-in-law......

The barrel becomes a cannon, and there is still a long way to go!

However, since even the problem of the barrel, which is the most difficult to build artillery, has been solved, then the artillery will finally be built, and it will be sooner......

And as soon as the first artillery is made, then the second, the third, a lot of them, will be soon!

"That's good, that's good!"

Zhang Ran touched the barrel of the gun that had just been taken out of the car, sighed with emotion, and couldn't help but want to cry......

He knew that there were more than 100 pieces of round shaft steel suitable for cannon barrels cut from three trains—not to mention, there were quite a few little devils' trains!

Coming out of the back mountain, what Zhang Ran saw was still the most thriving appearance in the base......

Although the output of copper is declining due to the taste of copper mines, it is still in production, and the fertilizer plant is also in full swing, and the militia of the people waiting to transport the fertilizer in the surrounding areas is endless......

The agreement reached with the little devils in Dingzhou City made it almost impossible for any production of the detachment to be disturbed......

Although it is very distressing to have to pay protection money to the devils in the state city for thousands of loads of grain a year, compared with the stable rear of the harvest, the price paid is absolutely negligible......

Long Xin is here.

Unlike before when she made an excuse to come to the detachment, this time, she received a telegram from Zhang Ran......

Deng Ying accompanied Long Xin in the room, and the second daughter, who had endless words as soon as they met in the past, was so silent for the first time......

Because the form of the base area was very good, Kang Ting, Shi Yuan and the others, who came in with Zhang Ran, found that the atmosphere was not right, and left Zhang Ran with the expression of a captain, you ask for more blessings, and then slipped away because they were busy with military affairs or had something at home......

"A bunch of unrighteous guys!"

Zhang Ran scolded with a smile, glanced at everyone's backs with mixed feelings, closed the door, and looked at Deng Ying......

Deng Ying nodded, the meaning was obvious, she had already told Long Xin everything she had told her!

"The devil has not yet been driven out of China, the revolution has not yet succeeded - are you going to be a deserter?" Long Xin's eyes were red and he stared at Zhang Ran.

"I did everything I could......" Zhang said.

He didn't want to say that now the Eighth Route Army has not only passed the most difficult period, but the little devils are declining again......

And with their own help, the Eighth Route Army has been able to make its own guns, and even artillery fire, and the little devils in the rivers and rivers are declining - it is foreseeable that compared with the little devils in the original history, the little devils in this life are destined to be thousands of times more miserable than the original in China......

There is no point in staying by yourself.

He didn't explain why he was leaving!

Because he knew, Long Xin must know, so he didn't need to explain to Long Xin at all, let him know that he was not greedy for life and afraid of death......

He just looked at Long Xin and said: "I know I'm greedy, I want green vegetables, radish and cabbage too, if you can, I really want you to go with us - believe me, now the big picture is decided, we have won, and we have done enough......"

Long Xin pursed her lips tightly, and Zhang Ran could see the tears in her eyes because of reluctance......

But in the end, Long Xin just shook his head resolutely and said, "I will bless you and Yingzi, and when the time comes, I will send you out!"

Deng Ying began to wipe away her tears, but she did not persuade her, because she had known the result for a long time.

Zhang Ran sighed.

Although he also knew that with Long Xin's character, what he could only get in the end was this result, but it was still a pity......

Then he took out the things he had written over the night, some papers, some letters......

"These are about nuclear weapons!"

Zhang Ran pointed to the thickest stack of documents, which he had summed up after reading the biographies of some scientists that were more important in the development of nuclear weapons......

Although these things that can be disclosed must be quite superficial because of the need for secrecy, but they are just some things that everyone will know decades later, Zhang Ran still believes that in that era, having these materials sorted out by himself will definitely help those scientists to avoid many detours, save a lot of materials, and save time......

In addition to these documents, then there are some letters.

The recipients of the letters are all chiefs who were injured in the detachment a while ago!