PS, thank you for the new worship boss, ¥ my, Gongfa Gu Derunyu, and Lei Chao of the creation of the four classmates for the reward!

Also, call for recommendation votes, today's recommendation votes are too bleak, brothers, recommend votes, vote!

……

The iron shell in front of me was poured with scrap iron melted in an earthen blast furnace.

Niu Da is a blacksmith, what to do in this regard, there is no need for Zhang Ran to teach him.

The only thing Zhang Ran explained was to carve grooves like the grenade shell on the mold, so that the explosive power of the explosives could be released from the weak points of those grooves, and more fragments could be blown up.

But this kind of thing is easier said than done.

After all, the iron shell is so thick, the iron quality is poor, not to mention the sand holes and the like in soil pouring, it is easy to pour unevenly, and it is like a broken cylinder when it is fried, a piece is gone, and most of it is intact!

Therefore, as a last resort, Niu Da can only return to the old road, the iron shell is thicker when pouring, and then it is burned red after the pouring is completed, and the groove is knocked out with a chisel......

And then it got stuck because the iron was too brittle!

After saying this, Niu looked at Zhang Ran with big eyes, a pair of big dark circles under his eyes looked like he was wearing black-framed glasses, obviously because of this, he didn't know how long he hadn't slept well!

"I don't blame you, I'm taking it for granted!"

Zhang Ran was busy admitting that he had made some mistakes in pouring the groove directly when pouring - soil pouring is not mechanical mold pouring, and it is all used in sand, where is it as simple as he thinks?

"Captain, if this kind of scrap metal wants to achieve the effect you said, it's really not good!"

Seeing Zhang Ran admit his mistakes, Niu Da breathed a sigh of relief, and said with some excitement: "And we don't have much iron, and we can still collect some from the villagers' homes for the time being, but the villagers don't have iron mines, so there will always be a time when they run out of iron - when even these scrap iron are gone, what's the matter?" ”

"Yo ......"

Zhang Ran looked at this guy's expression and suddenly said happily: "What's the matter?" Have another idea? Say, it's okay to be wrong - now we're working together! ”

"Let's use porcelain, what's the matter?"

Niu Da waved his hand and said excitedly: "Isn't porcelain just yellow mud burned?" When the time comes, you can have as much as you want, and you can make whatever you want when you pour it......"

“……”

Zhang Ran was depressed, and blocked back with a sentence: "If you want to say that you want to build mines, I will endure the use of porcelain-but what we are building now, the grenades will be lost...... Aren't you afraid that if you throw it out and it doesn't blow up, it will be broken with a bang? ”

"Don't be afraid, we can find a way!"

Niu Da faced the captain, we are not stupid, we all thought of what you were worried about: "Let's put a layer of rags on the bread, cotton or something, throw it out, and we won't be afraid of breaking it!" ”

“……”

Zhang Ran was even more depressed: "It's true that the villagers don't open an iron mine at home, but the villagers don't open a garment factory at home - a family just has a few clothes, three years of new and three years of old sewing and mending, three years after three years of sewing and repairing, three years after three years I really can't wear it, and the rag head has to be kept with the sole of the shoe to make the insole, do you think we can find so many rags and cotton?" ”

“……”

Niu Da began to scratch his head and sneered: "Then I'm thinking about it-why don't we use mountain rattan buns......"

"Don't think about it, it's absolutely not okay to use porcelain!"

Zhang Ran waved his hand and said, seeing Niu Da's puzzled expression, he had to explain patiently!

The power of the explosion must be generated in a very small range, and there must be a process of accumulation, and finally enough power can be born!

If the shell material is too fragile, then the explosive will shatter at the first time it reacts, and the power will be greatly reduced without the explosion and the process of energy accumulation!

Therefore, this is the reason why it is said that the problem of using porcelain as a grenade shell will be shattered, and it cannot be used as a grenade.

"Although the porcelain shell can't be used as a grenade, it can also be used as a mine!"

Zhang Ran looked at Niu Da, who looked lost after listening to the explanation, and hurriedly comforted.

Using a porcelain shell as a mine not only does not worry about the problem of breaking, but also because the mine is buried in the ground, there is a layer of soil reinforcement outside the shell, which is enough time for the power to accumulate!

Niu Da became happy and regained his confident appearance again.

"Let's get back to this iron-clad thing!"

Zhang Ran pulled the topic back and asked Niu Da: "You are a blacksmith, have you ever heard of the term simmering fire?" ”

Niu shook his head: "I know about quenching, I really haven't heard of simmering fire - captain, you tell me!" ”

"I've just heard of a way to simmer a fire, which can soften the surface of this hard, brittle pig iron......"

Zhang Ran also pulled his hair, looked at Niu Da and asked him to think of a way - he just saw from the Internet that the Eighth Route Army was engaged in military industry in the early years, and he also encountered the same problem as now, and finally solved this problem by simmering fire.

As for how to solve it, where does he know?

"Captain, where do you remember hearing about it? If it's not far away, let's ask! "Cow Boulevard.

“……”

Zhang Ran was depressed, and said in his heart that it was not far away, but it would take a few decades, and when the time came, it would be enough to check it on the computer, and there was no need to inquire at all!

Niu Da got up and left.

“…… Brother Niu, what do you mean? Even if we can't inquire, we can slowly figure out a way, what kind of anger! ”

Zhang Ran was taken aback, if such a sincere and thoughtful blacksmith was angry with himself, where would he find another one?

"I'm not angry!"

Seeing Zhang Ran's anxious face flushed, Niu hurriedly said: "I'm not leaving, I want to go back and ask my father to go - my father has been fighting iron for more than 30 years!" ”

When he said this, Niu Da said proudly: "Unless there is no way to simmer the fire, my father must know!" ”

"Then you go early and come back early - go to Secretary Wang and pay twenty oceans on the detachment's account!"

Zhang Ran shouted, thinking about Niu Da's expression, and said in his heart that Niu Da is so lucky, there is such a son as Niu Da who is proud and proud of him - if he gives birth to a son in the future, he must give birth to a Niu Da like this!

There are a lot of people who are angry with their fathers, anyway, he knows that he used to make his father angry enough.

Thinking of this, Zhang Xing's mood couldn't help but feel a little low......

However, he quickly adjusted his mentality and went to the explosives department of Mao Drill.

In the distance, he smelled a strong smell of urine, which was extremely unpleasant.

"What are you doing here?"

Zhang Ran almost covered his nose and entered the cave of the ammunition department, and saw Mao Drilldao boiling and stirring in a large cauldron.

On both sides of the pothole, there are also a large number of wooden barrels, and the strong smell of urine comes from this pot and the barrel!

"White phosphorus, have you forgotten, captain?"

The wool drill with two lumps of cotton in his nostrils pointed at the barrels and said, "Captain, be careful, it took me a lot of effort to collect so much urine ......"

“……”

Zhang Ran was depressed.

"Captain, come, I'll show you something!"

Mao Ran pulled Zhang Ran outside, and then mysteriously took out a hollow wooden stick, looked at Zhang Ran triumphantly and said, "Captain, you can take a good look......

As he spoke, he grabbed a cotton thread on his tail and pulled it violently!

In the hiss, the fire and green smoke came out in an instant!

"You, the hair pulling device has been successful, huh?"

Seeing this scene, Zhang Ran was extremely excited - he didn't expect that he had only been away for more than 20 days, and Mao Drill, who was doing artillery battles, could really drum out the hair pulling device!

"Captain, you said white phosphorus and white phosphorus before, I don't understand what it is!"

Seeing Zhang Ran's excited expression, Mao Zuan was extremely happy, and said with a swaggering face: "But I heard what the captain said that it is so easy to burn, it is estimated that it is this thing that boiled out of the urine, so I boiled some first and tried it, it was really ......."

White phosphorus can be boiled out of urine, Zhang Ran knew it, but he didn't expect Mao Drill to know.

"Hey, what's not to know about this? We are doing artillery battles, and it can be seen that the heavens are dealing with explosives! ”

Mao Diamond's expression was light and breezy, but his heart blossomed.

"I saw early on that Minister Mao was by no means an idle person, and now it seems that this is indeed the case!"

Zhang Ran laughed, and also looked proud of Lao Tzu's insight into the hero, complimenting Mao Diamond for a while, and then pointed to these hollow wooden sticks exposed to the sun and said: "White phosphorus is too easy to burn, so much under the sun, are you sure it's okay?" ”

"At first, it burned if I didn't pay attention, so I followed your instructions captain, and added a lot of things, and experimented over and over again!"

Speaking of this, Mao Diamond, who was doing artillery battles, actually had a bit of the rigor of a scientist doing research on his face: "This batch is the most ideal effect, even if it is dried in the sun, as long as there is this layer of wood outside, if you don't pull the lead, it will definitely not ignite by itself!" ”

"This attitude is a bit like the attitude of scientists engaged in research, Minister Mao, you have to make persistent efforts!"

Zhang Ran was very relieved: "In the future, these grenades will be carried on the backs of our soldiers to fight devils, don't fight devils, let's blow ourselves up first!" ”

"Don't worry, captain, I can save it!"

Mao Drill nodded and said: "I will continue to test the hair pulling device, try to do the best, but the delay ignition is still very unstable......"

As he spoke, he looked at Zhang Ran again.

Zhang Ran knew that when the Eighth Route made the grenade, the paper tube stained with explosive powder was used as the delay fuse device, and before there was a more scientific fuse method, the paper tube fuse method was the most reliable and ideal grenade fuse method in China at that time.

He told Mao Zuan about this idea, and asked him to experiment in this direction first, and they came back with a few finished products this time, and asked Cheng Dongshan and Xiao Sanyuan to dismantle them first, and when they didn't explode, they would be sent to him as research samples.

"It's good to have a sample, I'm groping by myself, I really don't know the bottom of my heart!"

Mao Diamond was very happy, and said confidently: "As long as there are samples, sooner or later I will be able to make grenades as good as those produced by regular arsenals!" ”

Thinking that one day, the soldiers will carry their own grenades made for artillery battles and blow up those little devils crying dad and mother, Mao Zuan is full of excitement and pride!