When Lao Zhudu was offering sacrifices to heaven and earth, he told heaven about the auspiciousness, but for some reason he didn't reveal it at all.

When Han Du was wandering around the streets these days, he didn't hear a single person talking about this matter. Logically speaking, people in the capital like to talk about all kinds of news, no matter who is promoted or demoted.

Someone's family is getting married again, or someone's boy is getting married again. Anyway, people are talking about it in the streets and in the streets.

In such an environment, as long as the slightest bit of news comes out, and food is related to the lives of the people, it will definitely become a topic that the people are eager to talk about.

But now there are no people talking about it. Without thinking, Han Du knows that it must be Lao Zhu who has blocked the news.

As for why Lao Zhu did this, Han Du didn't know and didn't want to know.

Han Du had no time to guess Lao Zhu's thoughts now. He had more important things to do, which was to receive Xue Xiang.

Xue Xiang has a head full of gray hair, but it has turned completely white in just two years. His face has ridges and grooves, as if he has aged by more than ten years.

Han Du saw the worried face and said, "What's going on, sir?"

Xue Xiang glanced at Han Du with a smile, waved his hand and said: "It doesn't matter, your hair will always turn white when you get older."

Han Du suddenly felt that he was a little inhumane to Xue Xiang. According to Xue Xiang's age, it was already time for him to take care of his grandson and take care of his old age. But because of his own selfishness, he stayed in the academy to work.

Han Du felt a little sorry for him.

"Are you too busy with college affairs, sir?"

Xue Xiang waved his hand and sighed: "What am I working on? It's just that I'm old and have to grow old."

Han Du smiled dryly and nodded, accepting Xue Xiang's statement. However, he still thought that Xue Xiang became like this because he was busy with the affairs of the academy. He originally threw away the academy to Xue Xiang just to escape from leisure.

I thought that I was free, but Xue Xiang had become like this.

Xue Xiang really didn't care. He paused for a moment and said, "But there are people in the academy whose hair has turned gray due to hard work."

"Who?" Han Du asked nonchalantly, with a relaxed look on his face. Anyway, apart from Xue Xiang, he didn't owe anyone in the academy. He was debt-free and had nothing to worry about.

Xue Xiang glared at Han Du angrily, his hair and beard bulging, and he clenched his fingers like dead branches tightly, wanting to beat Han Du.

"What did you do? Have you forgotten?"

What did I do? Han Du looked confused.

Xue Xiang shouted in a deep voice: "Have you forgotten about the reward of one hundred thousand guan? Or do you think that the academy can't build the machine at all, and you have never thought about offering this 100,000 guan?"

Xue Xiang's face was not kind. When he thought that Han Du might be deceiving those people in the academy, he had a bad look on Han Du. How many people in the academy had spent sleep and food for one hundred thousand coins. If Han Du dared to go back on his word, Xue Xiang would definitely not

He will let him go. Even if the trouble comes to the imperial court, he will seek justice for the gentlemen of the academy.

"I'm telling you, don't even think about going back on this one hundred thousand yuan! Otherwise"

"Who is going to regret it?" Han Du said without hesitation, "If they can really build the machine, I will give them one hundred thousand dollars."

"Did they really create it?" Han Du was immediately overjoyed.

Seeing what Han Du said so categorically, Xue Xiang's heart slowly relaxed. Hearing Han Du's question suddenly, he smiled awkwardly and said, "That's not true. I heard from Sun Xian that he hasn't reached that level yet."

Your request, now he is thinking hard about how to improve it."

Han Du felt a little disappointed when he heard that it hadn't been built yet. But then he thought it was natural. Although the academy had the guidance of the mechanics knowledge taught by his own professors, it wanted to let a group of scholars who had only read books from saints and sages in just two years.

It took a lot of time to build a steam engine bit by bit with both hands, which was too much.

Seeing Han Du's expression of disappointment, Xue Xiang said without hesitation: "Although Sun Xian said it was not enough, I think it is enough. After all, that thing can move on its own now, which meets your requirements.

opposite

Just don’t hesitate to give me 100,000 guan, I think even if it is like this now, you should at least give 50,000 guan.”

"Oh?" Han Du's eyes suddenly lit up. He didn't take Xue Xiang's request for money to heart at all, but was extremely interested in the progress he said.

He blurted out and asked: "Have they really built the machine to this point?"

Xue Xiang was a little unsure of Han Du's attitude, and hesitantly said: "Anyway, if you keep boiling water, the thing will keep moving. But Sun Xian said that the strength of the thing is too weak, and it can't be said to be of any use.

Now I’m thinking of building a bigger one.”

Han Du suddenly couldn't sit still, and stood up quickly to go out. After taking a step, he was suddenly shocked to realize that Xue Xiang was still sitting here. He quickly turned around and helped him, and said eagerly: "Sir, let's go now

Go to the academy."

Xue Xiang is such an old fox. Seeing that Han Du was so anxious, he became less anxious. He picked up the teacup, blew it slowly and said, "Why are you panicking? This is tribute tea. I haven't even taken a sip of it yet. Wait."

I'll drink this cup of tea before going."

Han Du is now eager to see how far Sun Xian and others have built the steam engine. How can he waste time here with Xue Xiang? But Xue Xiang is highly respected after all. If he is left here alone,

What would it be like if you ran away by yourself?

"It's just some tea leaves. Since Mr. Lao likes it, why not give it to Mr. Lao?" Han Du waved his hand grandly and immediately shouted towards the door: "Come here, pack two kilograms of tea leaves for Mr. Lao and deliver it to you."

Go up to the house."

"Yes, Lord Marquis." The servant waiting outside the door immediately went to do it.

Han Du then turned around and asked Xue Xiang: "Sir, can we go to the academy now?"

"Looking at what you said, I don't want your tea." Xue Xiang put the tea cup to his lips and put it down before he drank. He immediately stood up and said, "Without further delay, let's go to the academy right now.

"

Xue Xiang led Han Du to where Sun Xian and other man-made machines were, pointed at a huge iron bucket with a radius of five feet and a height of one foot, and said to Han Du: "No, this is that machine."

Han Du pointed at the huge thing in front of him in surprise, looked back at Xue Xiang and asked: "Is this thing still small?"

Xue Xiang shrugged, spread his hands and said: "I also think this thing is big, but Sun Xian said that its strength is too small. If you want to have more strength, you need to make it bigger."

Han Du suddenly felt a pain in his forehead and rubbed his face vigorously with both hands. Then he let out a long sigh and shouted loudly: "Where is Sun Xian? Let him come to see me."

Sun Xian was still in class. When he got the news that Han Du was looking for him, he insisted on finishing the class, and then hurried towards Han Du.

As soon as he entered the door, he quickly bowed to Han Du and apologized, "Sir, the students were in class just now. I am late, please forgive me."

"It doesn't matter, schoolwork is important." Han Du waved his hand, not wanting to argue with Sun Xian.

Do not interrupt the lectures. This is Han Du's own rule in the academy.

Han Du pointed at the huge thing in front of him and asked: "Is this the steam engine you built?"

Sun Xian nodded, looked at the behemoth in front of him with the doting eyes of a child, and replied to Handu: "Yes, but this thing has not yet met the requirements of sir, and it is not fully built yet."

Sun Xian thought that Han Du wanted to cash out the reward for him. Although he was also very jealous of the hundred thousand guans, one is one and two is two. If he built a steam engine that met Han Du's requirements, he would certainly not refuse Han Du's reward.

.But if Han Du's requirements have not been met, he will not ask for a reward.

After hearing this, Han Du nodded subconsciously and said, "I heard from the boss that your thing can move all the time now. Can you burn it for me to see?"

"Of course, sir, wait a moment, it takes a little long to boil the water." Sun Xian said quickly.

Han Du stretched out his hand to signal him to do whatever he wanted, "Go and do your work, I will

Just watching from the sidelines.”

"Okay." Sun Xian bowed slightly. After that, he took some of his students to help him and went to work on the huge steam engine.

The water in the steam engine is enough, you need to add some more water, and then replace some needed things.

After everything is ready, start lighting the charcoal under the machine. As the charcoal burns, add pieces of pebbles. After a while, the pebbles are filled and burning brightly.

A sizzling sound began to come from the huge iron bucket. The temperature of the water was slowly rising, tiny bubbles emerged, and the bubbles burst one by one to make a sound.

The huge iron horizontal bar on the iron bucket began to move, and then moved faster and faster. The horizontal bar drove another vertical bar to move, and the vertical bar was linked to an eccentric wheel, moving

The force of up and down movement is converted into the force of rotation.

Seeing the steam engine starting, Sun Xian walked up to Han Du with an embarrassed look on his face and said, "Sir, that's it."

Han Du took a look and thought there was no problem. Isn't that what steam engines are like?

"That's good. What's the problem?"

The embarrassment on Sun Xian's face became even more intense. Without explaining to Han Du, he walked directly to the eccentric wheel, stretched out his hand and grabbed the wheel. The moment Sun Xian grabbed it, the wheel stopped. Wait.

After two breaths, Sun Xian let go of the wheel, and it began to spin rapidly again.

"The strength is too small, not much greater than the strength of one student's hand, and still far from meeting the teacher's requirements. The student is preparing to pick up a bigger one to see if he can improve his strength."

Han Du became angry and stepped forward and kicked Sun Xian. He said with some hatred: "Why do I have a student as stupid as you? Do you have to build a bigger one if you are weak? What is the mechanics I teach you?

Food? Since you all know that you can use a pulley to lift a heavy object with less force, then why can't you do the opposite and make the force stronger?"

It was like a thunderbolt flashed through Sun Xian's mind, which made him feel numb all over, his eyes were dull, and he lost the ability to speak.

"First, what do you mean, sir?"

Han Du said angrily: "I told you during the lecture that the size of the force is related to the distance it acts. You all know that you can use a pulley to make the force of a heavy object smaller. Why can't you do the opposite and reduce the force of a small object?

The strength becomes stronger?"

"Hahaha, I know you have a lot of clever ideas, so I'm right to call you." Xue Xiang reacted before Sun Xian. Although he didn't understand what this machine was about, nor the principle of force,

But when he saw Han Du's expression, he knew there was something serious about it.

Sun Xian turned around, danced with his hands and feet excitedly, and said: "Sir, can the student install an opposite pulley here to increase the force?"

"Come, come here!" Han Du said with a serious face and waved to Sun Xian.
To be continued...