Ordinary glass has been done, but the glass used for the bulb, Lin Zifan took three days, and it took many attempts to finally get it.

This is followed by the assembly of the bulbs.

The strength of the national teacher is strong enough, and it is not difficult to make nitrogen, which reduces the pressure on the assembly of the light bulb.

After the light bulb was completed, Lin Zifan plunged into the department and began to study the hand-cranked generator......

It's not too hard, but it takes some time to make.

......

In Lin Zifan's busy time, the empress was bored again.

I've been staying in the palace in the past, but I haven't felt anything ......

But since she got acquainted with Lin Zifan, when Lin Zifan was away, the empress always felt as if something was missing, and she was a little uncomfortable.

Especially after having the experience of going to the school every day to be a substitute teacher some time ago, pretending to spot check the problem, but in fact it was a 'stealing teacher', now it is even more boring for the empress to stay in the palace honestly......

"It's better to ...... I'm going to be a substitute teacher again?"

"Anyway, Lin Zifan didn't have time to care about them, let alone ...... My steam engine is ready, and the students are definitely not ready!"

"Now's the perfect time for me to point them out!"

The more I thought about it, the more itchy I became, and the empress finally turned her heart sideways...... Done!

Who's afraid of whom?

Although I didn't make the steam engine, it ...... Who knows?

I said that I did it, and that was what I did!

Hum!

The empress didn't notice it herself, she was arrogant unconsciously, and then asked Tsing Yi Ziyi to lift the steam engine and go to the school......

......

In the academy, many students are anxious.

A month has passed, and although Lin Zifan did not say that he would definitely come back in a month, everyone knows that it will not be too far behind.

But now the time is running out, and the steam engine is only half completed, and it can't be installed until the end......

Especially pistons and cylinders......

At the end of the cylinder, there is only one small opening, and the piston is almost as large as the cross-section of the cylinder, and the small opening is only for the air intake hole behind the piston.

So, how can the piston fit into the cylinder?

This is a big problem~

In the era when there was no electric welding, it was really difficult to get this group of 'elementary school' students who had not yet graduated from half a bucket of water to solve this problem.

"What the hell should I do?"

"I don't know......"

"Who has a way? Take it out and try it! Otherwise, when the black-hearted maggot comes back, we won't be able to please us!"

"Hey, who has a way to do this? Even Deng Xiaoqiu was stunned......

"Siyu, do you have a way?"

"Siyu?"

The students scratch their ears and cheeks, and you look at me and say a word. Huo Mei wanted to ask Lin Siyu about it, after all, Lin Siyu was an older existence among the people, and because Lin Zifan was the lord of the mansion, he looked at her very strictly, so he learned very well.

But everyone found that Lin Siyu was holding the book alone, sitting silently in the corner, not saying a word at all, as if he couldn't hear anything.

Even her eyes were out of focus, obviously wandering.

Moreover, her hair is messy, her dress is a little untidy, and she looks very vicissitudes.

"Distracted again?"

"Really?"

"I don't know what's wrong with her, it seems that since the day His Majesty didn't come to be a substitute teacher, she has been like this often, right?"

"Who knows......"

The students had no choice but to continue to think of a way.

But at this moment, the door opened, and the empress came.

Behind him, Tsing Yi and Ziyi carried a steam engine, and his face was a little strange.

There is no way, in fact, no matter who carries such a strange-looking thing through the small half of Chang'an City, after suffering countless strange eyes, he will also have a strange face.

"Your Majesty?"

The students were shocked, but fortunately they were not lazy today, and they were not afraid......

Wait, it seems...... Someone is lazy?

They broke out in a cold sweat in an instant, and they were indeed not lazy, or most of them were not lazy, but they seemed to ...... There is a ...... Mind wandering, right?

But if you look at them all now, won't you be exposed?

No, I've got to sneak a look!

Many classmates have this mentality, and then their eyes tilted and swept towards the corner where Lin Siyu was.

But at this glance, almost everyone was taken aback......

, beauty, who are you?

Fang just sat in the corner, his eyes were not focused, and he looked very haggard and vicissitudes, where did Lin Siyu go???

In the corner, a young girl with a bright face, a confident smile on her face, her hair is not messy, and her long skirt is extremely neat, is reading a book......

And this young girl...... Isn't it special, who is Lin Siyu who has gone through the vicissitudes of life just now?

Quite a few students rubbed their eyes......

This Nima, what's the situation?

Will it transform or what? It doesn't make sense!

Their faces were full of astonishment, and they never thought of why such a change had occurred, why this was the case......

As if sensing the eyes around him, he saw Lin Siyu raise his head and smile slightly at everyone, and then seemed to have just discovered the arrival of the empress......

She stood up and saluted respectfully to the empress: "Your Majesty......"

"Hmm. ”

For her future sister-in-law, the empress's attitude is still quite gentle, huh...... At least in the eyes of the empress herself, she is gentle, at least she is smiling, isn't she?

As for whether that smile will scare the classmates or something, it is unknown.

"Are the students busy?"

"Do you know why I haven't shown up for the past few days?"

"I don't know ......"

The students blinked, expressing curiosity, but many people had already discovered the steam engine behind the empress, and then thought about it.

The empress grinned at the corner of her mouth, and her heart was instantly arrogant: "Hmph!

"Students, in fact, I see that you are working hard every day, but you don't know the essentials, and you are quite anxious!"

"Yes, I used my spare time to make such a steam engine, I hope it can help you!"

"Come on, come on, all the students come over to see what the steam engine should look like!"

"I believe that after reading it, coupled with my guidance, a mere steam engine will definitely be difficult for the students!"

"Your Majesty has made a ...... Steam engine?"

The students blinked, although they had already seen the entity, but it was still a little incredulous to hear the empress say it on the spot......

"As you can see. The empress lifted her chin proudly......

Well...... Although the main job is done by that guy, and I am only responsible for the hands, I am also a participant, right?

I said I made it, right?

For some reason, the empress's mind suddenly jumped out of Lin Zifan's appearance, which made her feel a little weak......