Qin Chuan almost forgot about the character Galileo.

This greatest scientist of the seventeenth century should still be alive.

Thinking of this, Qin Chuan tried to ask Luo Zixi: "Zixi, do you know Galileo? Do you know where he is now? Can you write a letter to let him come to Loufan for research? I can provide him with all necessary or unnecessary conditions."

Luo Zixi looked a little sad: "I have seen him and asked him for some knowledge of astronomy and physics, but just last year... a priest who came to the Ming Dynasty from Rome told me that he was under the trial of the Holy See."

Qin Chuan was a little disappointed and was judged by the Holy See, so he was basically done.

"So have you written to let some like-minded priests or friends come to Loufan?"

"Yes, I've left it all to Lao Huang, I don't know if Lao Huang can bring people back."

"Well, I don't worry about Lao Huang's work. You can write more letters. Whether you are a Han Chinese or a Western missionary, as long as you are interested in any field other than missionary, you can invite them. We have delicious food and drinks to entertain them."

"good."

"By the way, have you ever seen a thermometer?"

"I have seen that some priests with status in the Holy See have this thing."

"Well... let's talk about this thermometer first."

Then, Qin Chuan wrote down his ideas on making a thermometer.

First, the glass blowing tube must be blown very finely, and then mercury is poured into it. Like modern thermometers, the temperature is measured based on the thermal expansion and contraction of mercury.

As for the scale, the ice-water mixture can be used to locate the scale of zero degrees. Ice can be made with Glauber's salt, and boiling water can be used to locate the scale of one hundred degrees. The remaining scales are just positioned on average.

Finally, use the human body temperature to test the accuracy of the thermometer.

The body temperature of an adult is normally between 36 and 37 degrees, and fluctuates, but the deviation is not large. As long as the thermometer produced is within this numerical range, it can be used.

There are certain errors, but Qinchuan is not trying to accurately measure the temperature value, but is setting standards and establishing reference values.

Even if water at minus three degrees Celsius is measured to zero by his thermometer, it is fine. As long as all other values ​​are measured with this thermometer and all referenced to this standard value.

There are two difficulties in making this thing, one is how to blow out a glass tube with a fine enough inner tube.

With the skills of existing workers, it is probably impossible to blow it out.

Qin Chuan’s idea is: use a certain soluble substance to make an inner mold and cast it directly.

This inner mold can be divided into two parts. One is the part where mercury is stored at the bottom. The space is larger than the pipe above. You can poke the material melted when heated into a small ball to make the inner mold of this part. First cast this part, wait until the small ball melts, then insert a thin iron wire and cast the pipe wall of the second part.

In fact, this pipe wall does not need to be as thin as the glass tube thermometers in later generations, but the thinner the better, the finer the better the precision.

Another difficulty is the air problem in the pipe wall.

The interior of the glass tube thermometer in later generations was in a semi-vacuum state, which not only prevented the effect of atmospheric pressure from decreasing the measurement accuracy, but also allowed the mercury to automatically flow back after cooling.

Galileo's thermometer is open-type, and the measurement accuracy will inevitably be affected by atmospheric pressure. If it is directly closed without vacuuming, the inside is full of air, the air will also expand and contract.

Therefore, the ideal state is semi-vacuum.

Qin Chuan thought about it all night last night and finally came up with a solution.

Making a syringe, which is used in later generations, when the thermometer is filled with mercury and sealed, use the syringe to extract the air inside while the sealed glass is still in a gel shape.

It is impossible for the syringe to evacuate all the air inside, so that a semi-vacuum state can be formed.

Of course, this is an idea.

There will definitely be many difficulties in actual operation.

Qin Chuan is not in a hurry. He pays attention to the process in everything, studies it slowly and solves the difficulties slowly, so he can naturally do it.

After leaving the laboratory, Qin Chuan walked straight towards the gun factory.

Chen Zhan and Li Xuejing built an unfinished external combustion engine, which is the Stirling engine he had made before.

There was a technical problem with that engine, Chen Zhan and the others never broke it, so Qin Chuan had to go over and take a look.

But as soon as he walked halfway, he was stopped by a messenger.

"Report to General, Director Luo of the Commercial Department and others are waiting for you to have a meeting."

"Um……"

Qin Chuan slapped his forehead and forgot that there was an important meeting.

I just came back, there were too many things.

The gun factory is not allowed to go, the iron factory is not allowed to go, the agricultural management base is not allowed to go, and the military academies and schools are not allowed to go.

And Cuixianglou...

In desperation, Qin Chuan had no choice but to turn around and walk towards the city tower.

After entering the conference room on the city tower, I was already full of seats.

Among the departments, there were only people from the Commercial Department, Military Affairs Department and Intelligence Department, and the rest... were Sutai, Namuzhong, Tesna, Orzhetu, Ezhe and the remaining tribes of Chahar, as well as the red-clothed lama named Murgen.

Zasak Elinchen of the Ordos tribe and a noble leader were also present.

These people with strong influence in various tribes were invited back to Loufan by Qin Chuan.

The name is to protect their safety, but in fact it is house arrest.

Before Qin Chuan completely grasped and consolidated the Hetao area, they would stay in Loufan.

When he returned yesterday, Qin Chuan wanted Tessna to go directly to the inner courtyard, after all, the woman he slept and was about to marry.

But Wencheng strongly opposed it, saying that he had to choose a good day to marry him. Even if he was a side house, the procedures had to be neat and the scale would be high.

It is necessary for the entire Ming Dynasty and the Mongols in the north and west of the desert to know that Qin Chuan had inherited Lin Dankhan's women, so Lin Dankhan's territory and population should be inherited by him.

What my father-in-law said makes some sense, so Qin Chuan had to endure it for a few more days.

As soon as he walked into the conference room, Qin Chuan discovered that the eyes of Orzhetu and Su Tai were lingering on Luo Wentian's face.

This guy is in a high position, has a better temperament and a more demeanor, so he is naturally more attractive to women than before.

"General."

Seeing Qin Chuan come in, Luo Wentian hurriedly got up and saluted.

Su Tai and others hurriedly withdrew their gaze, stood up and stroked their chests, while the lama in red shaking the prayer wheel in his hand.

"Everyone sit down."

Qin Chuan patted Luo Wentian on the shoulder, then walked to the map and drew a circle in the north, northwest and west of the Hetao region.

"Today I asked everyone to have a meeting, mainly to figure out what forces, roles, and relationships they have in these places."

As he said that, Qin Chuan looked at Su Tai and Namu Zhong with a smile on his face, and pointed to the circle in Mobei.

Su Tai, Namu Zhong and others looked at each other, and then they realized the purpose of Qin Chuan calling them to come.

"Yes, I want to have all the information in these areas."

"The three Khalkha tribes in the north of the desert, the four Weilat tribes in the west of the desert, the Khalkhatukhan in Qinghai, the Bailitus in Kang District, the Zangpakhan, Gru, Kagyu and other factions in Uszang, as well as the Yarkand in the west, and even the Khanate countries such as Kazakhs, Siva and Bukhara in the west."

"I want to know the approximate size of these Khanate or tribes, their population, their troops, how big the territory they occupy, whether to pay tribute to the Ming Dynasty or to the Hou Jin?"

"And, who are their leaders, who are they, who will be enemies with me, who will be willing to trade or even form alliances with me."
Chapter completed!