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After testing the naval gun, Tong Yu also tested the field gun and the city guard gun respectively. Compared with the ultra-long range of the naval gun, the range of the field gun is much shorter, with a range of only three or four miles. This is also the requirement of the field gun, because it aims to eliminate the enemy's living forces, and the target of the attack is naturally within the field of vision.

The range of the city defense cannon is between the two, but it is much more powerful. It is good choice to install it on the city gate or use it to siege the city.

"Your Highness, are you still satisfied with these three cannons?" After the test shot, Tong Yu asked Li Yan nervously.

Li Yan nodded in approval because Tong Yu had already crossed the primary artillery directly, but raised the artillery level to the rear-loading gun. "It's done well, how did you think of this post-loading bullet?"

After receiving Li Yan's approval, Tong Yu's eyes smiled into a crack. He said, "I decided to develop a post-installation after discussing with Guo Xianyuan. The information provided by His Highness also contains post-installation cannons. The machine tool he bought cannons can also produce parts for post-installation cannons, so I focused on post-installation cannons, otherwise I wouldn't have been delayed for so long to get the cannon model out."

Li Yan walked to the cannon and picked up a shell from the wooden box next to the cannon. The top of the shell was a round solid bullet, and the bottom was a cylindrical shell shell. Although it was a little ugly, it was similar to modern shells. Li Yan asked: "You invented this shell."

"Yes, Your Highness, this is based on the principle of firing guns. I think since firing guns can be fired directly, why cannons cannot be? So I made shells according to the bullets of the firing guns, but the effect of paper was not good. Later, I replaced them with copper shells, but it was successful." When I said this, Tong Yu's tone was mixed with a hint of luck.

Li Yan asked the craftsman to open the bolt. He looked at it and there was indeed a firing device on it. Although it was just such a simple structure, it would greatly increase the loading speed of the artillery. The fire cap in the shell was also a necessary condition for firing. In short, there was half of Guo Xianyuan's contribution here. This fire cap was discovered when he was refining alchemy.

Overall, Li Yan highly appreciates the three cannons developed by Tong Yu. Unfortunately, these shells are all solid bullets, not flower bullets. However, what the flower bullets require is fuse technology. This high-end technology cannot be developed with Taoyuan's technical level for the time being, but this has already made Li Yan very satisfied, and people cannot be too greedy.

After patting Tong Yu on the shoulder, Li Yan smiled and said to him: "You will be the first person in the history of artillery in the Tang Dynasty in the future."

Upon hearing this, Tong Yu was immediately excited. Everyone’s dream was left in history, and today he finally realized it. He is no longer a useless person who only knows strange skills and tricks in the eyes of others.

Qin Huaiyu and Zhu Youzhi seemed to have just woken up from the shock of artillery. Zhu Youzhi said: "Your Highness, if artillery is equipped with an army, it will greatly improve the combat capabilities of the army and can greatly intimidate the surrounding sluts."

"Don't be anxious. Since the artillery has been finalized, it will be produced soon. At that time, the army will add a brand new army. Artillery!" Li Yan said loudly. The successful development of the artillery also gave Li Yan a reassurance. The emergence of this powerful tool will greatly make up for the shortcomings of the army in Shu.

Qin Huaiyu looked stupid. The weapon of artillery was completely beyond his imagination. If this shell continues, even if you have the ability to do everything, you can be beaten to pieces. The era of personal courage will soon become a thing of the past.

Zhu Youzhi nodded. "Your Highness had thought of it for a long time. Although Youzhi had also seen some descriptions of artillery, it was only today that he saw it with his own eyes, which was really shocking."

Li Yan smiled and said without saying a word. He turned around and said to Tong Yu, "These three types of artillery are good, let the workshop start production!"

"Yes, Your Highness!" Tong Yu smiled, and Li Yan's words officially marked the birth of the first generation of artillery in the Tang Dynasty.

After appreciating the artillery test, Li Yan and the other four walked to Taoyuan. Now there is a strong academic atmosphere everywhere in Taoyuan. The introduction of modern teaching has made it a trend of controversy here. There are people in each laboratory of the institute who are busy. Some are studying the application of steam engines in production, some are developing new chemical products, and some are trying to make machinery. Different courses are offered for each interest and different people. Now, Li Yan is basically implemented in Taoyuan. According to Tong Yu's requirements, Li Yan is also constantly providing the items needed by Taoyuan, whether they are chemical raw materials or various experimental equipment.

Passing by a chemistry laboratory, Li Yan smelled a special smell. He gently pushed open the door and looked inside. There was a young man in his twenties. At this time, he was stirring a pot of meat oil. There were already many white blocks of different shapes on one side, which turned out to be the most primitive soap.

Li Yan did not disturb him, closed the door gently and said to Tong Yu: "We must encourage craftsmen to develop new technologies, especially projects listed as key points. We must not slack off."

Tong Yu walked beside Li Yan and said, "Yes, Your Highness, I have listed all the industrial equipment drawings you provide as key research projects, and also provided the greatest financial and technical support."

When steam engines are developed, many industrial equipment that requires steam engines can be developed and produced. Once these equipment is developed, it will greatly improve the production capacity on Li Yan's fiefdom. This is also something that Li Yan is concerned about. Of course, other science and technology are not left alone, but are also being carried out at the same time.

"Well, what is Guo Xianyuan doing recently? Why haven't you seen him?" After a while, Li Yan didn't see the figure of Guo Xianyuan, a fake Taoist priest, so he asked.

Tong Yu smiled proudly and said, "Guo Xianyuan is competing with me! Now I guess I'm going to the steel yard to pester Ou Yewang again."

"What's going on?" Li Yan asked with interest.

Tong Yu said as he walked, "It was because of the shell shell that he was unwilling to accept my shell shell and said he wanted to turn the bullet into this way. I said that the bullet shell was too small and there was no such condition at all. He didn't believe it, so he pulled Ou Yewang to build the shell shell, but he tried it several times but failed."

Li Xianyuan was a black line. Guo Xianyuan was really a scientific madman, but he was already very satisfied with the paper-shell bullet. However, it was good that Guo Xianyuan had this idea. Maybe he could really achieve the manufacturing of copper-shell bullets.

After a walk around the institute, Li Yan went to the opposite military camp again. After a long time, the three of them were a little tired, so they sat down and rested in the military office. Zhu Youzhi left the artillery test site and locked his eyebrows. At this time, he pondered for a moment and said, "Your Highness, this institute is crucial. The confidentiality of artillery and other technologies cannot be ignored. If it is obtained by others, it will be extremely unfavorable to the Tang Dynasty. I suggest that Your Highness set up an institution to control and prevent theft technology from being used in detail."

Qin Huaiyu took a sip and said, "I agree with Yuzhi's words. Now the changes in Shu are changing thousands of miles a day. Tuyuhun attacked Songzhou because of the wealth of Yizhou. There may be other people who are indisputable to Yizhou and have to be careful."

The reason why the two of them made such a proposal shows that they are really thinking about Li Yan. Li Yan said: "I have already thought about the new household registration system to prevent intrusions from being involved in meticulously. Work permits and passes are also to ensure that the institutes and other places are not mixed up by some people with bad intentions. No one can fake these three things, so this risk can be greatly reduced."

"But what if some people are bribed? For example, gunpowder ratio, you just need to say it verbally." Zhu Youzhi asked again.

Li Yan laughed and said, "For this reason, gunpowder was not invented by Guo Xianyuan. Now many Taoist priests can refine gunpowder, so there is no need to hide anything about this. However, I also know the matter of preventing fine work. Now I am considering reorganizing Wuhouting."

"Reorganized Wuhouting? Didn't Your Highness hand over Wuhouting to Cui Zhang?" Zhu Youzhi said.

"This is different. Cui Zhang represents a legal institution, and Wuhouting is an institution that enforces the law. The right I give Cui Zhang is to urge Wuhouting to enforce the law judgments, but Wuhouting still needs special people to manage it." What Li Yan said was actually the relationship between the modern procuratorate and the Public Security Bureau.

Zhu Youzhi nodded, "So that's it. How does Your Highness plan to reorganize Wuhouting?"

"The Wuhou Mansion was established to uniformly manage all Wuhou Pavilions in Bashu, and at the same time form a special security agency, responsible for monitoring important personnel and arresting detailed works." Li Yan did this in fact, turning the shadow guard from secret to light and into a formal institution, and from now on, it is officially responsible for investigation and anti-investment. Su Mo'er will become a regular official, responsible for collecting various intelligences.

With the soldiers in his hand, Su Moer can use the collected information to deal with the hidden threats, including those businessmen with dissatisfaction, meticulous works, officials and soldiers, to ensure the stability of Li Yan's ruling group.

When Li Yan said this, Zhu Youzhi and Qin Huaiyu nodded. It seemed that Li Yan was more thoughtful than they thought, but Li Yan's words of surveillance of important people also made them feel a little surprised. Does this important personnel package include them?

After arriving at this topic, Li Yan simply treated the three of them for a short time this time. He told Zhu Youzhi: "By the way, you can't relax the military affairs. All available students are arranged to various military departments to establish the military management system, take some time, let's go to the academy together, give these available students down and allocate them!"

"Yes, Your Highness!"

The two responded in unison, from the various measures issued by Li Yan one after another, they vaguely felt that Li Yan was strengthening his rule over the fiefdom, which was what a vassal king should do.
Chapter completed!