I was engaged in infrastructure construction in the Han Dynasty [Transmigration Book]

Liu Tan remembered that greenhouse technology already existed in the Western Han Dynasty, and it was recorded in the "Han Shu".

It's just that when he asked, not only Li Xi, but also everyone around him looked blank, Liu Tan couldn't help but feel a little strange. After thinking about it carefully, he found that when the record was about Emperor Han Yuan, there were still seven or eighty years left. .

Since there is no ready-made use, it has to do it yourself.

Fortunately, most of the rooms in this village, or in other words, except for the servants and some warehouses and utensil rooms, basically have earth dragons. Liu Tan only needs to choose one as a greenhouse.

Li Xi followed behind Liu Tan with an unimaginable expression on his face: "This... can really make the branches sprout and grow in autumn and winter?"

Liu Tan nodded and said, "Yes, as long as the temperature and humidity are up to par."

Li Xi looked at him blankly and asked, "I'm so dull, I don't understand what Your Highness means."

Liu Tan: ...

To put it bluntly, there is no concept of humidity and temperature these days.

So the question is, since there is no concept of temperature, how does he control the temperature?

As far as he knows, in ancient times, the control of temperature was all based on experience. Even the supervisors of firing porcelain were experienced people who could visually observe the flame and judge the temperature by the color of the flame. Generally, such a person did not have twenty years of experience. Can't do it.

Oh, he almost forgot, there is not even porcelain now, or it has not yet developed into porcelain, and now there are more pottery.

The difference between pottery and porcelain is in firing.

Having said that, there may not even be many people who can judge the temperature through experience. Of course, the ancient people were wise. They figured out the seasons according to the weather. It is quite accurate to carry out agricultural planting according to the seasons, but put aside this idea It is very difficult to judge accurately.

Liu Tan simply asked Li Xi, "Does Da Sinong have such talents?"

Li Xi smiled wryly: "This... is the first time even the house warming minister has heard of it. I'm afraid the Dasinong Mansion is not good at this kind of thing."

Liu Tan was helpless, it seemed that he had to come by himself.

To control the temperature, first make a thermometer.

The thermometer looks simple, but it is actually quite simple to make.

A little red pigment in a glass tube will work together.

So now the question is, where are the glass tubes these days?

In this era, the west should have glazed glass, but it is estimated that there is no glass with high transparency in the world, let alone thin glass tubes that require extremely high skills.

Liu Tan doesn't have time to make glass. The only thing that can be replaced now is probably crystal, but can crystal be made into such a thin crystal tube?

It's not that he is strict, but that there is no specific criterion for judging these days, and there is no other comparison. The only criterion that Liu Tan can use to make a thermometer is the boiling temperature of water.

His original plan was to make a model of the thermometer of later generations, and then put the thermometer in when the water was boiling to see where the red liquid in the transparent tube rose to, which was the approximate range of [-] degrees.

Then divide this range into [-] equal parts to get a rough thermometer.

It's a very simple method. Many children in future generations will let them do this when they cultivate their hands-on ability, because it is lively and interesting.

It's just that it's not lively and interesting at Liu Tan's place now. Only then did he realize that without an industrial foundation, even a small handicraft would encounter countless difficulties.

One advantage of Liu Tan is that he never gets in trouble with himself. His understanding of the Han Dynasty is only what is recorded in historical books or excavated from the mausoleum, and those things are not enough to live in this era.

Liu Tan thought for a while, this kind of handicraft industry should be under the management of the Shaofu, at least he needs to go to the Shaofu for anything he wants.

The only thing he was not sure about was whether he could find the Shaofu, so he asked Fu Yu very tactfully: "Is there any crystal in Curry?"

Fu Yu was at a loss for a moment: "What is His Highness talking about?"

Liu Tan immediately corrected: "It's Shuiyu."

He almost forgot that the ancient name for crystal was water jade.

Only then did Fu Yu say: "What kind of water jade does Your Highness want? Even if there is none in the library, you can go to the lady."

Liu Tanxin thought that although Chen Ajiao was the queen, she couldn't change this thing.

He just said: "I just want to make a water jade tube about the length of a palm, the hollow one, so what is needed is the water jade rough stone."

Fu Yu was a little embarrassed: "I'm afraid I have to look for this."

There is no shortage of good things in Liu Tan's library, and there is no shortage of water jade products, but the problem is that no one will directly send rough stones to Chen Ajiao.

Li Xi next to him said: "Shaofu should have this thing, but I don't know what your highness wants to make it?"

Liu Tan directly asked Miao Rui to bring over a piece of paper, and drew a crooked diagram on the paper. Originally, he wanted to write on it, but the moment he picked up the pen, he suddenly remembered that Liu Che and Chen Ajiao might not care much about it. Li Xi probably knows what his handwriting looks like. Maybe Li Xi will be surprised why it is completely different after he writes this handwriting.

Liu Tan simply put the pen aside and began to explain. Fortunately, this thing is not too complicated, it just needs to be hollow, and then the bottom end needs to be covered with metal, so it needs to be opened from the bottom, and then the part where the metal and the water jade are in contact with should be tightly sealed. Air will do.

Li Xi was stunned for a moment, but he didn't understand what Liu Tan wanted this thing for.

Before Liu Tan asked him to find grape seedlings, he could still understand, and he could even understand a thing or two about grafting and greenhouse technology, but what is this thing doing now?

Liu Tan originally wanted to explain, but it turned out that the more he explained Li Xi, the more confused he became. In the end, he was very simple and rude: "Anyway, it is useful, and the possibility of grape seedlings surviving with it is higher. Don't ask, just ask. You don't understand either."

Li Xi rubbed his nose. He knew how to fight all his life, and he was very proud that he was good at fighting. He really didn't care much about other places.

He smiled a little ashamedly: "Your Highness is well-informed."

Liu Tan: ...

Anyway, this guy has been your "son" for more than ten years, don't you know if he is well-informed?

Li Xi conveniently filled in the key points on the paper. He pondered for a while and said, "Shuiyu is easy to find, but it's thin and hollow. I'm afraid it's not easy."

Seeing that Liu Tan saw that he couldn't help but decide to let them find the original stone and do it himself. Fortunately, he has strong hands-on ability.

It’s just that what Liu Tan didn’t expect was that it was so difficult to find raw water jade. Most of the raw water jade stones are not transparent enough and have too many impurities. It is basically impossible to become pure and transparent. Even Liu Tan has lowered the requirements. Just look at the water mixed with the red pigment inside.

Well, because there is no pigment, Liu Tan can only use the same color instead. Fortunately, this thing does not have such high requirements for materials, otherwise he would really give up at this moment.

When Liu Tan was struggling with the thermometer, he didn't know where Lu Xuan learned that he was looking for the raw water jade, so he brought a whole piece of very high-purity water jade to him.

Liu Tan couldn't help having a headache when he saw Ajiamu coming in holding the paint box beside him.

The golden horse last time really left a deep impression on him, even if the gift was expensive, the lacquered box outside was also worth a lot.

The lacquer box this time is similar to the last one, except that the decoration on it has become a tortoise shell, and the image of a fish has been made in an exaggerated way.

Liu Tan looked at the box and asked, "What is this?"

Lu Xuan said with a smile: "I heard that His Highness was looking for a water jade, and I happened to have a pretty good water jade, so I sent it to you."

As he spoke, he looked at Ajiamu. Ajiamu immediately stepped forward and put the box on Liu Tan's table and opened it. Raw jade stone with very good purity.

Liu Tan could tell that this rough stone should be a semi-finished product that had been processed and polished. Its length was slightly longer than his palm, its width was almost the same, and its thickness was also about the same. The best ever.

However, a water jade of such purity should be a very valuable item in this era, especially if it is not too small. Liu Tan was embarrassed to directly buy it, so he said: "This rough stone is too precious, I can't accept it."

After hearing this, Lu Xuan fixedly looked at Liu Tan and asked, "Didn't Your Highness say that we are friends? You and I should be regarded as good friends now. Isn't it right for friends to help each other?"

I don't know if it was because Lu Xuan's eyes looked too clear, Liu Tan couldn't bear to deny the other party's statement for a moment, but said: "You are willing to help me, I am naturally happy, but even if this crystal is my It’s rare, and you don’t need to spend money like this.”

Lu Xuan smiled and said: "It's just something outside of the body, so what's the problem?"

His smile is really like the moonlight pouring down, reflecting the brilliance of the room.

Of course, when it comes to Liu Tan, I can only think: Fuck, it looks so good.

Even though he and Lu Xuan had met many times, it was not the first time he saw the other party's smile, but every time he couldn't help but take a second look.

After Lu Xuan realized it, he would smile even brighter.

Liu Tan realized that he was about to be taken aback by a man's smile, so he quickly turned his eyes away and said, "In that case, I will not be disrespectful."

Although he said so, Liu Tan still decided to repay the favor.

His attitude towards Lu Xuan is actually quite complicated, Lu Xuan is a nice person, at least he treats him well, so he actually wants to make friends with Lu Xuan, but Lu Xuan's identity is too sensitive, and it is troublesome for Liu to talk about his situation If in the future, no matter whether it is Liu Ju or Liu Fuling who gains power, he will be given a foreigner in the future, who will he turn to for reasoning?

So even though he felt guilty in his heart, he still decided to draw a line with Lu Xuan.

It has to be said that the water jade sent by Lu Xuan is indeed very useful, but he is also very strange, why Lu Xuan happened to have such a water jade in his hand, and he couldn't find it no matter how hard he searched before?

He said this casually that day, and Bi Gao said cautiously: "Your Highness...you should go to the Shaofu for this, Li Xi... how good can you find it?"

Liu Tan was stunned for a moment, and then realized that he seemed to have made a mistake all along.

As an institution dedicated to serving the imperial family, the Shaofu must have many good things, and Li Xi... used to be just a Marquis of the Guannei. Although he was also a nobleman, his home and the places he could find were definitely not as good as the Shaofu.

The corner of Liu Tan's mouth twitched and he turned his head to look at Bi Gao and asked deeply, "Why didn't you know to remind me?"

Bi Gao smiled awkwardly. He originally thought that Liu Tan didn't want to disturb the emperor and empress. Who would have thought that this person really didn't think of sending someone to the Shaofu to ask for it.

Liu Tan looked at the semi-finished product in his hand. He had been manually grinding this crystal tube for several days. Although Bi Gao and the others said they would help, Fu Yu and Cen You were not strong enough. Not meticulous enough, they were kicked aside by Liu Tan after breaking two of them.

Forget it, use it all up, what else can I do?

After the grinding was finished, Liu Tan directly left the production of the thermometer to Miao Rui and asked him to find someone to do it well, and told him the operation method.

With the thermometer, the greenhouse, and the strong grape seedlings, everything is ready, but the east wind, and then Liu Tan found out that he had to do the grafting by himself.

Liu Tan... Liu Tan can probably imagine that in the future there will be rumors that the Fifth Prince likes farming.