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After Li Shimin returned to Chang'an, Li Su accompanied Cui Yingying to play in the mountains and rivers of Yizhou for a few days, which can be regarded as relaxing, during which Li Su handed over the Shu land to him to manage and told Cui Yingying, Xiao Nizi is happy and worried, happy is Li Shimin's love for Li Su, worried that Li Su has invisibly offended the Guanlong nobles and the other four surnames in the five surnames, Cui Zhang came to Yizhou and told her about the court situation in Chang'an, she naturally understands the key points, after all, today's Tang Dynasty can be so stable, It was all up to Li Shimin to win over the Guanlong Group and the Shandong Shi clan, but Li Su did the opposite and did not buy the face of these people at all.

On this day, on the way back to Yizhou City with Cui Yingying from Dujiangyan, Cui Yingying finally couldn't help but say: "Your Highness, even if you are unwilling to win over the scholars, it is better not to offend!" ”

"You don't understand, I also have to do it as a last resort, now the hands of the northern scholars are too long, if I don't give them some color to see, how can they stop." Then Li Su told Cui Yingying about Lu Jin.

After listening, Cui Yingying sighed, this Lu family and Cui family are still in-laws, not to mention other scholars, thinking of this Cui Yingying's heart was sad, "Yingying is just a little worried, my father can still protect His Royal Highness, but if my father dies that day, how can this noble union be difficult for His Highness?" ”

"Hmph, if there is a day, they will have to grow a good pair of teeth to be able to gnaw this king." Li Su said disdainfully, and then he comforted: "I have my own measure, and I won't get too stiff with them." ”

Li Su's words are just comforting Cui Yingying, he understands that with the technology of the Yue era, he can no longer coexist peacefully with those Shi clan gate valves, a group of wolves will face a fat sheep Everyone knows what, even if this sheep cuts off its own meat to feed the wolves, but there will always be a day when the cut is finished, Li Su is now this sheep, his technology is destined to attract the attention of the Shi clan gate valves in this era, what can these gate valves be inherited by this day, It's not that they can squeeze something to enhance themselves, how can they not feel itchy and uncomfortable in the face of Li Su now, so Li Su will not accompany the smiling face and give away the things in his hand, he himself is at a disadvantage, and then let them have the same technology as himself, so can Li Su still have a way to live?

Cui Yingying felt a little relieved when she heard this, if she was an ordinary woman, she would be fine, but she was the princess of Shu, and she couldn't help but think about Li Su.

The two returned to Yizhou City, Cui Yingying went home first, and Li Su went to Taoyuan, which was what he was most concerned about.

Nowadays, a fortress has been built at the entrance and exit of Taoyuan, this fortress is similar to a medieval castle, with three floors up and down, staggered with each other, and the staggered position is a walkway about four meters wide to stand guard, and each of the four corners of the fortress has an arrow tower, each arrow tower is guarded by four archers.

"Your Highness, there are now secret sentinels within a radius of ten miles from the entrance, and once the existing people come in, they will be expelled immediately, and the name of the outside world is that there is a limestone mine here, do you think this is okay?" Li Su and Kim Daqian stood at the bottom of the fortress, and Kim Daqian reported.

Li Su looked at the slaves and maids who came in and out, and said, "Yes, there are still these slaves and maids who must keep an eye on them, and they can't happen again last time." ”

"Yes, Your Highness!" Jin Daqian's buttocks ached faintly, but this time he remembered, "The old slave has already ordered that the slave and maid who have escaped now will be executed immediately." ”

Li Su nodded, there are only a very few slaves and maids who escaped, they are well fed and warmly clothed under Li Su, and they can marry wives and have children, which is much stronger than before, so far there has been a slave and maid escape, which was premeditated by Lu Jin.

After looking outside for a while, Li Su walked in from the five-meter-high city gate, Taoyuan is more than 20 miles long, the size is comparable to Chang'an City, and this will be Li Su's secret industrial and military base in the future.

Entering the cave, the sound of metal hitting the rocks around kept sounding, the cave used to be only more than two meters wide, more than three meters high, and it was very difficult to transport some slightly larger objects, and now Li Su ordered the cave to be expanded to five meters high and five meters wide, so that large instruments could also enter and exit in the future.

After the transfer of the research institute, all the personnel and equipment have now arrived in Taoyuan, but the construction of the new scientific research institute will take some time, so Tong Yu and the craftsmen temporarily lived in the abandoned village to continue research.

When he arrived in the valley, Li Su looked up, there were busy slaves and maids everywhere, transporting cement bricks and tiles, and carrying wood, Li Su's goal was to modernize the construction here, so there were more cement bricks and tiles here, and there were fewer wooden houses, and what he was afraid of was that the guys from the research institute accidentally set the house on fire.

Passing through the peach forest, Li Su and Jin Daqian arrived at the small village, which was more lively, with people coming and going, several earthen blast furnaces had been built and were smoking, and some blacksmiths were hammering and casting weapons.

Tong Yu and Du Pingzhi were standing in the middle of the road, surrounded by a circle of people, the noise was very noisy, Jin Daqian wanted to report, but Li Su stopped him, so as not to disrupt their train of thought.

Li Su turned around and continued to walk south, the research institute has basically taken shape, hundreds of workers are laying bricks, plastering cement plastering cement, the structure here is still similar to the previous research institute, the difference is that the residential area and the research institute are separated, but a small village is built separately for them to live, and it has become a place for pure research and experimentation.

Opposite the research institute is the barracks, over a hill that rises more than ten meters high can be taken into view, this barracks is completely in accordance with the modern barracks to build, is currently laying the cement floor, a playground is also under construction, after a few days Li Su is ready to go to the modern purchase of some sports equipment, what horizontal bars, parallel bars, a word horse are bought to install it, on the playground he is also ready to set up a football field, basketball court, the life of a soldier is boring, leisure training to be correct.

Li Yu was thinking about it, a slave and maid pushing a cart suddenly fell to the ground, the wooden cart fell to pieces, he shook his head, and looked at the other transport slaves and maids, the tools they used were basically wooden carts, the wheels of this cart were made of wood, and they were very easy to break.

When I was in school, Li Su practiced at the construction site, and I remember that there is a very simple short-distance transportation tool on the construction site, which is similar to a small cart, but it carries a square open iron basket on it, which can hold bricks, cement and other things, which is very practical, and the small cart here is a flat plate on the wheel, and it is easy to fall off when pushing things, so it is better to buy some and put it here.

In addition to this, Li Su also remembered a primitive transportation tool, a manpower tricycle, this thing is too suitable to get here, easy to get started, not to mention, the key is durable, practical, simple maintenance, he doesn't want to buy some modern transport vehicles, the key is not a problem with a large number of purchases, the problem is the follow-up oil burning and repair problems, these machinery three days a small problem, ten days a big problem, it is estimated that it will not take long to get all the nest.

Now the four walk-behind tractors have made him deeply experienced, or the actual local industry, so that the production of the machine can be maintained in time, therefore, Li Su is currently locked in the transportation of manpower and animal power, some necessary machinery is purchased in small quantities, here can reach the national rural transportation level in the seventies and eighties, as for the future, and then to the steam engine, internal combustion engine and other power equipment step by step, scientific research is a matter of many years, can not be achieved overnight.

After making up his mind, Li Yu came down from the hill and returned the same way, and when he passed through the village, he bumped into Tong Yu, who was about to salute and shouted, "Your Highness!" ”

Li Su was thinking about buying something, waved his hand casually, and said, "Don't salute, go and get busy with you!" ”

Tong Yu was stunned for a moment, and hurriedly chased a few steps forward: "Your Highness, Tong Yu still has something important to report." ”

"What's the matter?"

Tong Yu hesitated for a moment and said, "Your Highness, please come with me." ”

Seeing Tong Yushen's mysterious appearance, Li Su followed him to an open area outside the village, where a group of people were surrounded, and Li Su saw Du Zhiping and Guo Xianyuan with a group of people gathered together.

Tong Yu led Li Su to the front, and he said, "Get out of the way, Your Highness has arrived." ”

Hearing this, the group immediately dispersed, Du Zhiping and Guo Xianyuan came over and saluted, and then let them go, Li Su saw clearly what everyone was surrounding just now, it was a cylindrical metal object, which was resting on a wooden board at this time.

Tong Yu walked up to the object and said, "Your Highness, we are studying the flint gun you brought, but we think to ourselves that the thicker the diameter of this barrel and the more gunpowder it is filled, the more powerful it will be?" So I made zuò come out of this, I wanted to invite the palace, but I didn't expect to meet His Highness. ”

Li Su circled around the object, and finally understood that this shoddy iron pipe was the prototype of artillery in history, but this appearance was too ugly, not to mention the thickness of the wall of this steel pipe, not to mention the surface was the same as pockmarks, Li Su was convinced, people are turning cannons into guns, these people are turning guns into cannons, but it's okay, this cannon will have to be developed sooner or later, "Have you tried it?" How powerful. ”

Li Yu's calm expression made Tong Yu not calm, could it be that His Royal Highness has also seen this, he said slanderously, "I tried it once, I think it's okay?" Tong Yu's tone was a little uncertain.

"Ignition let me see how powerful it is?" Tong Yu's okay is extremely poor in Li Yu's understanding, after all, they have never seen real artillery.

Tong Yu answered, ordered a few people, these people immediately began to pour gunpowder into the barrel, and then began to stuff all kinds of gravel into it, when he saw this, Li Yu was desperate, this is really the most primitive artillery.

There was a small round hole at the bottom of the artillery, Tong Yu wrapped some gunpowder in paper, rolled it into a cylindrical shape, and said to Li Yu: "Your Highness, please cover your ears." ”

Li Su not only covered his ears, but also walked a long way, he really didn't have confidence, if this thing exploded, it would be dangerous, he said: "If you light a fire, stand far away." ”

"It's okay, Your Highness, I've tried a few times." Tong Yu was quite confident at this time, and said to a craftsman, "Ignite the fire." ”

When the craftsman heard this, he took the torch and lit the lead, Li Su saw that the lead was about to burn, and then there was a "boom" sound, and several pieces of gravel flew out of the barrel in Li Su's field of vision, and the distance of landing was different, and the farthest flew about thirty meters and fell.

Jin Daqian was startled, and almost didn't stop, the sound was too loud, Li Su sighed, it was okay to take out this artillery to scare and scare people, but it was very rare for them to think and develop it by themselves in this era.

"Bang Bang!" Li Su applauded, "Very good! ”

Tong Yu's face was happy, "Thank you, Your Highness, for your appreciation." ”

"But this kind of thing is already available in the information I gave you, this is called artillery, for this kind of artillery, the barrel must be a little longer, and the front of the barrel wall should be thinner, and the back should be thicker, because when the gunpowder explodes, the bottom pressure is the greatest." Li Su explained.

Tong Yu's ominous premonition was true, and Li Su had really seen this kind of thing, but then he listened to Li Su talk about the method of making artillery with great interest.

"As for the making of this cannon barrel, you go back and tell the blacksmith to let them make the mold out of the mold with yellow clay, and then pour the molten steel into the mold......" Li Yu said and walked with Tong Yu and the others to Tong Yu's temporary real room, in the real room, Li Su told Tong Yu how to make the mold, and asked Du Zhiping to go to the data room to report the artillery information.

Du Zhiping answered yes, and then ran out, and after a while, he came in with a push of information.

Li Su took the information, flipped through it, and took out the design drawings of the red-clothed cannon, this is simple enough, there is everything in the process of making the cannon, Li Su opened the information, asked Guo Xianyuan, Du Zhiping and Tong Yu to come over, and told them the principle of making the red-clothed cannon.