I

"Student Chen Weisong, meet your Majesty! Meet the Queen! Meet..."

As a student representative, Chen Weisong and several other good students were sent to the stage to bow before him.

Mainly because the hot air balloon flew away and was completely invisible. We had to find something to do, otherwise hundreds of people would stand there in silence.

Zhao Han nodded and smiled: "I have heard of your name. Are you Chen Zhenhui's son?"

Chen Weisong replied: "The students are frightened. The student and his son can actually make His Majesty worried."

As the fourth prince in the late Ming Dynasty, Chen Zhenhui always put on airs and refused to serve as an official. After working for several years, I couldn't help but want to be an official, so I came to the Hanlin Academy and successfully applied.

Chen Zhenhui is a typical representative of those who "do not eat Zhousu". After the Qing Dynasty captured Jiangnan, he went directly to live in seclusion in the mountains. Not only did he not want to be an official, he even refused to enter the city. In the end, he died of old age in the mountains. In this time and space, Chen Zhenhui at least entered the Hanlin Academy to engage in academic research.

Zhao Han encouraged, "If you study well, you will make great achievements in the future."

"Thank you for your majesty's encouragement. The students will definitely be determined to learn." Chen Weisong said happily.

Zhao Han looked at the girl standing in the front row again: "Are you Wen Shufen?"

"Exactly." Wen Shufen stepped forward and bowed. She didn't know much about etiquette, and her speech was not as elegant as Chen Weisong.

Zhao Han praised and said: "As a woman, from a poor family, you can work hard to get into Jinling University. I know it is not easy for you. A gentleman is like jade, so you can change your name to Wen Ruyu. A woman can also be a gentleman."

"Thank you, Your Majesty, for the name!" Wen Ruyu was trembling with excitement.

A poor woman who studied hard and became famous, and was given a name by the emperor, would be a good talk if it was spread. If some legendary scenes are added, it can be turned into a play.

If Jinling University hadn't banned casual entry and exit, from now on, the school's threshold would have been trampled to pieces by matchmakers.

Zhao Han talked to other students again and encouraged them. Everyone was happy.

Suddenly, Lu Tianxiang jumped out and knelt down on the spot and kowtowed: "Your Majesty, after I learn 500 words, will you let me be a female general?"

As soon as these words came out, the whole place was silent, and then there was a slight chuckle.

With Lu Tianxiang's complexion, she looked like a barbarian woman. She didn't understand etiquette at all, yet she came here to ask to be a female general. Many students tried hard to hold back their laughter, but it was so painful that their cheeks hurt.

"You don't have to kneel down when you stand up to speak." Zhao Han said with a smile.

Lu Tianxiang stood up neatly, held his head high and looked directly at the emperor. She was actually a little scared, but she wanted to show off her heroic appearance and hoped that the emperor would agree on the spot.

Zhao Han looked at the girl carefully. His first impression was that she was tall. With the naked eye, she was probably over 1.7 meters tall. He asked: "If you want to be a female general, what are your abilities?"

Lu Tianxiang said: "I can ride and shoot, and I can also use a knife. My archery is very accurate."

Zhao Han said: "If this is all, then you can only be a cavalry soldier and have to rely on military merit to be promoted step by step."

Lu Tianxiang said: "I have made meritorious service. Mu Kui of Huajiao Zexi was captured by the Datong army after I shot an arrow."

Zhao Han said: "This kind of credit can be achieved by ten cavalry leaders."

"There are only ten soldiers, can you let me command a hundred?" Lu Tianxiang asked.

Zhao Han said: "Are you buying groceries? And you are still bargaining."

"Then give me fifty soldiers." Lu Tianxiang really counter-offered.

This conversation made everyone extremely happy, but they did not dare to laugh out loud, otherwise it would be disrespectful to the emperor.

Zhao Han also found it interesting and said with a smile: "I'll wait until you learn a thousand Chinese characters."

But Lu Tianxiang said: "Your Majesty, I heard that there was a General Zhang who only knew a few hundred words and became a division commander. I don't want to learn a thousand words, but can I only learn 500?"

Zhao Han couldn't help but sigh: "Unexpectedly, my General Zhang has been fighting in the north all year round, and his illustrious reputation has spread to the southwest."

"Your Majesty, is five hundred words okay?" Lu Tianxiang confirmed again.

Zhao Han didn't know whether to laugh or cry: "Okay, when you know 500 characters, come to me with your belt card."

Zhao Han asked the female official to give him a waist card, which would be a one-time use and would be taken back after the audience with the emperor.

Is this even fucking okay?

More than two hundred teachers and students were astonished. After messing around with His Majesty, they actually got the palace badge.

"Thank you, Your Majesty. I will definitely work hard to learn literacy!" Lu Tianxiang burst out with endless motivation to learn.

Fang Yizhi and his son flew away for a long time and did not come back. Zhao Han was too lazy to wait any longer and immediately drove back to the palace.

In the middle of the afternoon, Fang Yizhi finally came back and ran excitedly to see Zhao Han.

After a report, Zhao Han said: "Write down the essentials of the hot air balloon and hand it over to the Ministry of Industry. All departments of the Datong Army can equip this object and use it with telescopes to observe the battlefield. Also, you can let people continue to experiment and try Use other reliable fuel to keep the hot air balloon flying as long as possible. It landed in just over a quarter of an hour, which is too short a time."

"I obey the decree!" Fang Yizhi said.

Since it is useful, those who participated in the invention must be rewarded.

Especially the students who participated will be able to enter Qintianyuan Physics Museum without taking exams if they graduate in the future.

Zhao Han asked: "Do you know why hot air balloons can reach the sky?"

Fang Yizhi replied: "Buoyancy."

"Very good!" Zhao Hanlong said happily.

The Frenchman invented the hot air balloon, knowing it but not why. Fang Yizhi understood the principle, which is really commendable. It seems that the physics research of Qintian Academy has made rapid progress.

Perhaps, we can also try to encourage growth.

Zhao Han said: "I have an idea. When an iron pot boils water, the steam can open the pot lid. Can we make a machine that uses steam to drive machinery, just like water power drives a large spinning wheel? Such a machine would be great to build. The spinning wheel does not need to be set up by the water, it can be used anytime and anywhere, and you can spin yarn and weave cloth by burning charcoal."

Fang Yizhi suddenly thought deeply, feeling that it seemed feasible, but also felt that he had no clue.

Zhao Han said: "You can go back and think about it slowly. You can also make the matter public and let people with insight come up with ideas together."

Fang Yizhi left with confusion, but Zhao Han was looking forward to it.

Regarding the steam engine, Zhao Han only knew that the steam did work, but he had no idea how it worked. It seems that the junior high school physics textbook mentioned it, but all of it was returned to the teacher. So many borrowings and repayments were made, and the physics teacher did not even say thank you.

But Fang Yizhi returned home and thought hard about the steam engine.

In the evening, Xu Zhengming came to visit and said excitedly: "Did your hot air balloon really take people to the sky?"

"Don't you know that we took cats and dogs to heaven last time?" Fang Yizhi said.

Xu Zhengming scratched his head and said: "I always feel that hot air balloons are unreliable. They can be blown away by the wind and cannot be controlled. What if they fall? I didn't expect that I actually took people up and down again."

Fang Yizhi sighed: "Stop making flying chairs and make steam machinery with me."

"Steam machinery?" Xu Zhengming was confused.

So Fang Yizhi started to talk about the basic principle, which is to boil water and use steam as power.

Xu Zhengming was immediately inspired. Can he make an oversized flying chair, and then boil water and use steam to drive it?

This guy only thinks about helicopters.

As for the task given to him by Zhao Han, Xu Zhengming has once again made great achievements and improved the warp bed for spinning to thirty. It only took Xu Zhengming three months to upgrade from 20 to 30. He felt it was too simple, so he tried his best to modify the helicopter.

Fang Yizhi and Xu Zhengming convened more than a dozen scholars and craftsmen to begin research on steam engines during the summer vacation.

Fang Yizhi is responsible for the overall thinking, and Xu Zhengming is responsible for the specific design.

A few days later, Xu Zhengming drew a simple cylinder and pointed to the drawing: "Use a sealed iron pot to boil water. The steam enters and pushes the movable air plug to the right. The piston is then connected to the connecting rod to drive the flywheel to rotate. When the flywheel rotates half a turn, it will push the connecting rod back, and the connecting rod will push the piston to the left, expelling the waste steam from below. New steam will come in again, pushing the piston to the left, and the flywheel will continue to rotate. .”

"Wonderful!"

Fang Yizhi was amazed by this design, and then raised doubts: "The steam keeps coming in, pushing the piston to the left, and where does the flywheel get the strength to push the piston back to the right."

Xu Zhengming pointed to the drawing and said: "A sliding rod is installed on the flywheel, and the sliding rod is connected to the movable valve. When the piston drives the flywheel to rotate, the flywheel drives the sliding rod, and the sliding rod drives the valve, which can block the air pipe. , to prevent new steam from coming in. Only after the piston is pushed to the right and the exhaust gas is discharged, the valve will reopen and new steam can come in. "

Fang Yizhi said in surprise: "How did you come up with it?"

Xu Zhengming said: "I thought about it when I went home."

As a well-known carpenter, Xu Zhengming does more than just play with helicopters. He has built many exquisite objects in his hometown. Gears, connecting rods, flywheels and other devices have long been used with ease, and they are all made of wood.

The two called on their assistants to continue to refine the design, select the materials for each component, and then let the blacksmith hammer it.

In just one month, the world's first steam engine was placed in front of Zhao Han.

"This is what happened?" Zhao Han couldn't believe it.

Xu Zhengming said: "Your Majesty is so smart that he came up with a way to boil water and boil steam."

Do you despise me?

Zhao Han asked: "How long have you been designing?"

Fang Yizhi pointed at Xu Zhengming: "In four days, he took out the first set of drawings."

Zhao Han was speechless for a moment and could only say: "Try boiling water."

The boiler uses charcoal. After cooking for a while, the connecting rod drives the flywheel to rotate rapidly without stopping.

So simple?

The famous steam engine was built in just one month?

It’s too casual!

Zhao Han felt it was unreal. If he had known this, he would have had someone invent this thing a few years ago.

However, the efficiency of the first-generation steam engine was too low. Taking into account the cost of burning charcoal, it was probably not much better than artificial spinning. Moreover, the supporting steam spinning machines and steam looms also need to be redesigned.

The steam engine ran for half an hour, and Zhao Han stood there and watched for half an hour.

Suddenly, it got stuck.

Xu Zhengming said awkwardly: "It's a small problem, I'll open it and fix it."

Zhao Han suppressed his excitement, exhaled a breath and said: "Go back and improve, try your best to improve!"