Coin making is a big deal, and Zhao Han cannot ignore it. Although Mao Geng has the final say in the matters of the SAR, and Zhao Han cannot interfere, the issuance of coins and coins is of great importance. There is great knowledge here. Zhao Han is very interested in Mao Geng's coin making and issuance. How can such a good opportunity to learn and learn from!

On the morning of the opening of the coin, Zhao Han stayed at the Duke's Headquarters and was already very excited, but he forced himself to suppress his compulsory orders. When it was almost noon, he asked someone to inform Mao Geng that he would look at the entire coining process.

When Chen Man came back, Ye Shi also came.

When Ye Shi saw Li, Zhao Yan said strangely:

"Mr. Ye, what's the point of doing when you come here?"

"Teacher Mao was stumped by a difficult problem today. He was thinking hard at this moment. He asked me to make a leave of absence from the country, so he was very focused and came up with a solution. As for the matter of coin making, I have been observing and pondering for a while, and I have already learned a little about it, so I accompanied the Duke of China to inspect. Although Chief Mao's coin creation has different differences, there are actually many similarities. If the difficult parts are discussed, how do you agree with the Duke of China?"

Since Ye Shi said that, Zhao Han certainly couldn't say that he had to accompany Mao Geng. He just didn't know what difficult problem could stump Mao Geng. This was a strange thing, so Zhao Han became curious and asked:

"Mr. Ye, what a difficult thing is this? It actually made Mao Geng stumped!"

Ye Shi scratched his head a little, thinking that he didn't know whether to take this matter or not. Originally, Mao Geng had the words first, so it would be better not to let the outside world know what he was busy with. But since Zhao Han asked, it was not convenient to lie, so he could only tell the truth:

"I learned from the Duke of the State that Zhuge Liang invented a kind of crossbow called Zhuge Crossbow. Mao Geng also heard from his master. Mao Geng suddenly had a thought in the past two days and wanted to create powerful weapons similar to Zhuge Crossbow. But Zhuge Crossbow is not so easy to make. Even if Mao Geng gets his master's advice, it is not easy. Therefore, he has been almost unwilling to eat and devoted himself to the crossbow these two days."

"Oh." Mao Geng was devoted to building advanced weapons for the Song Dynasty. Such things should be encouraged. At this time, it would be better not to disturb them. So Zhao Han was in a good mood and followed Ye Shi to see the coins with great enthusiasm.

Mao Geng wanted to build Zhuge crossbows for no other reason. Mao Geng felt that before Kang Xiaolu and Ma Wu went to the Isthmus of Kra, in order to ensure the success of the operation, they had to be equipped with some combat equipment. Considering that fighting in mountains and tropical rainforests, continuous firepower was crucial, which was verified in the self-defense counterattack against Vietnam. It didn't matter if there was no automatic firearm. Mao Geng thought of a solution, which was a crossbow - Mao Geng was preparing to equip them with a crossbow.

In his previous life, Mao Geng saw the speculative model of Zhuge crossbows online. The principle is not complicated, but he doesn't know whether it is good or not. It doesn't work in actual combat. Perhaps, this kind of crossbow that can output continuous firepower in theory can really become a melee weapon in the rain forest. In any case, Mao Geng decided to give it a try and make a small batch of crossbows to bring them as auxiliary weapons for their actions. First, there are not a few handy weapons, so do you feel embarrassed to call it special combat? Second, even if it is captured by the natives, you are not afraid of technical leakage. Just copy it. This is not a weapon of mass destruction. What can the enemy do if it is made?

Although Zhuge crossbows are not complicated, Mao Geng is already very busy. He has to create such crossbows in just a few days. It must be simple and practical, not stuck, stable in performance, and decent power. It is really a very labor-intensive thing. Therefore, Mao Geng basically pushed forward other things if possible. As a result, Zhao Han wanted to investigate silver coins, and Mao Geng pushed this matter to Ye Shi. Ye Shi was happy to be ordered. The currency system issue was originally something he wanted to supervise. Mao Geng was not guarding against Ye Shi, so Ye Shi followed up throughout the process and was considered half a coin expert. However, he had agreed not to disclose the crossbows to the outside world in advance, but Ye Shi reported the matter to Zhao Han as soon as possible.

The stamping coining process is much higher than the minting coin, and the process is much more complicated.

First of all, casting silver-copper alloy ingots. There is not much mystery in this. The only thing is that when silver and copper begin to melt, sprinkle a layer of charcoal chips on the liquid surface to prevent oxidation. It can be said that Zhao Han didn't care about the heat or the quick cooling. He looked around and had no interest.

Then the silver-copper alloy is repeatedly rolled. The thick alloy ingots are rolled gradually and become thinner. The middle is annealed to remove internal stress, rolling, annealing, and then rolling. After more than a dozen rolling processes, they are finally rolled into thin sheets.

This is not the first time Zhao Jian has seen this rolling process. The iron sheet used for iron ships is also rolled in this way. When Zhao Jian looked at it that day, he was very curious about the thick plate passing between two rolls. When the roll rolls, the thick plate became thin plates. He was still very curious at the time, but after seeing it once, he lost much curiosity this time. While listening to Ye Shi's explanation, he walked in a hurry and looked at it. Even if this process was finished, he had finished reading it.

The next moment, Zhao Han came to the main workshop of coin making.

Fang Gengshu was concentrating on a punching machine to stamp silver coins. He heard the sound of speaking and knew that it was a big shot to investigate the coins. But Mao Geng had told him that he had to concentrate on opening the punching machine, otherwise he would hurt himself if he was not careful. Secretary Fang Geng remembered Mao Geng's warning and insisted on stamping.

He put the coin blanks that had rolled high in his hand into the punching die, and then stepped on the punching pedal with his right foot. This cycle was repeated, and the stamped silver coins kept falling into the basket, and a small hill was piled up in the basket after a while. Fang Gengshu thought, it would be great if these silver coins belonged to him.

After a while, the big shots gathered at Fang Gengshu's stamping station.

In fact, before the last stamping, there were several processes, such as cutting the blank of the disc, rolling out a high side higher than the disc, and polishing it on a centrifugal grinder - Chief Mao called this process "de-scaling", but it was obvious that no matter who visited it, without exception, they were most concerned about the last stamping process.

Ye Shi walked to the finished basket placed beside him, took out a few of the stamped finished silver coins, and handed them to Zhao Han. While looking at the exquisite coins in his hand, Zhao Han saw Fang Gengshu skillfully operating the punch press to stamp each silver piping circle into each silver coins. Well, what was rushed out became the silver coins in his hand, and the size and shape were the same.

Zhao Han walked over and took out a semi-finished product from the semi-finished basket. Compared with the semi-finished product, the semi-finished product is a glossy silver circle with a high edge rolled out, and tooth marks rolled out on the original edge. Mao Geng had previously introduced that this was to prevent someone from tampering with silver coins. The more Zhao Han thought about it, the more reasonable it was. The forest in the Song Dynasty was very large and there were all kinds of birds. With this thick edge with teeth, illegal people could not make trouble on the round edge of the silver coins. Otherwise, if it was flat, there would definitely be treacherous people cutting the edge to get the silver. The silver coins would only get smaller and smaller. In the end, the silver coins would be big and small, which would be messy.

The finished silver coins are shiny and very smooth. Unlike copper coins, there will always be defects such as sand holes. The silver coins stamped in this way can be called flawless. The most important thing is that every silver coins stamped out are just the same, and there is no difference. Well, such coins are good! On the contrary, the copper coins minted by the imperial court over the years have become worse and worse in terms of quality. I feel ashamed!

Fang Gengshu recognized that the one who was explaining was Ye Shi. Ye Shi was already an extraordinary figure, but it was obvious that the object of Ye Shi's diligent explanation was the bigger figure. Finally, Ye Shi said the word "Duke" in his mouth. Fang Gengshu thought to himself that it was Duke Zhao Han who came to visit, and suddenly became very excited for no reason.

When Fang Gengshu was excited, the rhythm of his hands and feet became messy. If he accidentally injured his fingers. Fortunately, Fang Gengshu reacted quickly. Within a flash, his fingers quickly retreated, which only hurt the tip of his index finger on his left hand, and there was nothing serious. Later, Fang Gengshu admitted his mistakes repeatedly, which made Zhao Han feel good about Fang Gengshu. Since then, Zhao Han remembered that a man named Fang Gengshu under Mao Gengshu was a man named Fang Gengshu.

After reading the entire process of stamping and coin making, Zhao Han thought about stamping and asked Ye Shi all the way, why the silver piece was like a ball of mud, easily printed with patterns and words.

In the spirit of a good person to send Buddha to the West, Ye Shi led Zhao Yan to the mold making workshop again. Ye Shi told Zhao Yan that mold making is the key. If Mao Geng did not have the mold making technology, the silver coins would not be stamped out at all. Even if they could barely stamped out, the patterns would not be exquisite.

In the mold making workshop, what opened Zhao Han's eyes was that he saw the contour engraving machine that Mao Geng regarded as a treasure. On one side of the contour engraving machine was a large model, which was more than ten times larger than a real coin. One end was close to the model, and the other end was told to rotate the sharp knife head on the steel mold. That's it, carving bit by bit, and the patterns and words can be slowly revealed.

This is a mold carving a round coin. It is said that it will take two or three days to carve it. Zhao Yan felt it was very wonderful. He stared at it for a long time before he left reluctantly. He thought to himself, this kind of engraving machine is really amazing, but you must not be learned by the Jin people.

So Mao Geng reminded Ye Shi:

"I think such a magical engraving machine is to be placed in a special room, and idle people cannot wait to enter. You go and talk to Mao Geng. I think it's all right, it's all about coins, so be careful."

"I also reminded Mao Geng, but Mao Geng said that even if outsiders read it, they can't learn it. It's not that easy to imitate it! Therefore, there is no need to worry about it."

When Zhao Yan heard Mao Geng say this, he relieved himself and said:

"Is that true! That's fine."
Chapter completed!