After broadcasting the ancient times live, I handed the system over to the state.

Looking at this harmonious scene under the sky, especially the way everyone was eating, laughing, and talking.

While Zhu's mother was eating, she also invited several of her close friends from the Tang Dynasty to visit her when they had free time.

They naturally agreed and didn't mention it.

The conditions for traveling to the future are still quite stringent. One is to pay points, another is to apply and be approved, and then there is training, because the future China has not yet announced to other countries that they can travel through time and space.

This is classified as confidential.

Considering the national level, it's easy for them to figure out that things are relatively strict in this regard.

However, they could also consider traveling to the Ming or Song dynasties, especially since the Song dynasty had even more delicious food and fun activities, which they all longed for.

“My second daughter is going to school. She wants to study even more. I’m saving money for her education. If she does well in her studies, she might be able to do more things. If she can become an engineer, that would be a blessing from the gods!” The Tang Dynasty woman, who was holding her hair and was called Aunt Lan by Zhu Qinggu, had bright eyes when she talked about this.

The engineers in the factory were responsible for repairing the machines, and even the managers and leaders had to listen to the engineers. They thought the engineers were the most capable people.

Before this, it was not easy for boys to study, let alone girls.

What was paper before? They had heard of it but never touched it. But now, paper is used casually at work, and it's getting cheaper and cheaper, so they can afford it.

In Zhu's mother's words, it was progress.

"What's the harm in that? Part of it is for Er Ya's schooling, and part of it is for keeping some money for ourselves," Zhu's mother said softly, then laughed.

Zhu Qinggu perked up his ears, but his mother pushed him away slightly, saying, "You're just a child, don't ask questions."

Zhu Qinggu: "..."

Seeing Miss Zhu speechless on the sky, the people below laughed.

(We heard everything Mrs. Zhu said. Should we tell Mr. Zhu?)

(Mr. Zhu is probably having dinner now? He might be able to see this too.)

(I guess their family wouldn't dare to object, right?)

This statement revealed the truth. Zhu Qinggu looked over and saw several young female workers who were close to his mother but not yet married. They also looked confused but wanted to hear what was going on.

Zhu Qinggu smiled helplessly.

Zhu Qinggu spent an afternoon observing the textile factory, dye factory, and garment factory. Zhu's mother was originally a senior team leader, and she spent the afternoon training newcomers or leading teams to tackle how to handle certain patterns.

When it was time to hand over the shift, everyone headed out of the small gate on the textile factory side. It wasn't far to the school from there, where the bells and drums were ringing as classes ended.

Some of these children are children of Chinese people working in the industrial park, some are orphans, and others are children sent from nearby villages or even the city.

They were dismissed from school at four o'clock, but the teachers were not dismissed yet. Training courses for workers started at four o'clock, so some children left and some workers came, and the teachers also handed over their shifts.

Zhu Qinggu listened for a while and discovered that these people were talking about reciprocating motion, mechanical motion, conveyor belts, bearings, and clutches.

Isn't the old teacher in the picture the same old engineer they saw in the factory?

"When the engine's drive shaft and the machine's driven shaft move in the same straight line, we connect the two shafts to form a direct drive structure. This connecting part is called a coupling..." The old engineer drew a cross-sectional diagram of a coupling on the blackboard with chalk, and also marked some shaded areas with diagonal lines.

The veteran engineer will also take out a part to show everyone the linkage mechanism.

The people below nodded in agreement.

Later, when discussing some simpler parts, the senior engineers would even come up and ask them to explain the meaning of the lines in the cross-sectional diagram.

Zhu Qinggu had to admit that these people's learning had progressed to another level, no longer limited to math problems.

The senior engineer then talked about clutches, including jaw clutches and single-disc friction clutches.

"...This is a friction clutch. Look here, it uses the friction between the surfaces of two discs to transmit power. When pressure is applied to a pair of friction surfaces of the clutch, it will drive the two shafts to move together. When there is no pressure, the two shafts will disengage."

"Friction clutches can be used when the drive shaft rotates at various speeds."

The text then discusses gear-driven mechanisms and their general applications.

Zhu Qinggu listened attentively, and the old engineer explained things in a very simple way. The people below had attended previous classes and knew what pressure and friction were, but they hadn't studied in depth how to calculate friction and pressure, nor had they learned more about physics. The old engineer was just trying to give everyone a feel for the concept.

Similarly, the mechanical principles class at this time also broadened everyone's horizons.

"...The disadvantage of gear transmission is that gears are difficult to manufacture. I know that after seeing the sky screen, some craftsmen tried to improve the loom and try to make gears out of something, but manufacturing gears is too troublesome. If they are not manufactured precisely, they will make a clanging noise."

As the old engineer spoke, the people below echoed his sentiments.

The people of the Tang Dynasty were still figuring things out, but they were certainly not as quick as the people of the Ming Dynasty. After all, the people of the Ming Dynasty had hundreds of years of experience to build upon.

However, it was equally difficult for people in the Ming Dynasty to make gears.

The senior engineer's explanations gradually became more in-depth, and he began to discuss how to calculate the transmission ratio and its relationship with the diameter, number of gears, and rotational speed.

He came up with a formula, which the people below seemed to understand but didn't quite grasp, but they would write it down first and ask him if they had any questions later.

In contrast, Zhu Qinggu found it much easier to see.

Basic education is still very important in this process.

After class, Zhu Qinggu and some other students who had questions asked the senior engineer before coming over to chat with him casually.

The old engineer's surname is Liang. He was born during a time when the country was engaged in a massive construction project, so seeing this scene here felt very familiar to him. The students' thirst for knowledge reminded him of his own childhood, when everyone was so positive and full of energy.

"...They also attend some basic math and physics classes in the evenings. Today's lesson is based on the math and physics classes we had last night or the night before. By the way, this class is also an advanced class that has gone through several exams. They are the pre-engineer trainees we are cultivating."