"Repaired?" David stood up with his eyebrows and several students stopped their work and looked back at Xia Zuo.

"It's repaired, come and have a look!" Xia Zuo turned sideways and straightened the small steam engine a little, and said with a smile.

David dropped the wrench in his hand, strode around several students, walked to the wooden table, and after a brief look, he glanced at Xia Zuo with a strange look, walked to the wall beside him, pulled a tube as thick as an arm, turned around and turned on the steam engine.

David glanced at Xia Zuo again and slowly unscrewed the valve.

Scream!

The whole thing enters the engine through the pipe, and a row of small holes at the top of the Tongtian engine are discharged. The pressure in the engine gradually increases, the exhaust holes are gradually closed independently, and the shaft of the steam engine begins to rotate slowly, and the speed is getting faster and faster.

Success!

David said nothing seriously, closed the valve, unplugged the tube, turned around and looked at Xia Zuo.

"Sir Xia Zuo, have you learned these before?" David was very serious.

"Is self-study counting?" Xia Zuo asked back, glanced at the steam engine on the table, and asked, "Teacher, are you okay?"

"Yeah!" David nodded and asked again, "Did no one teach you these...? What do you do at home? I mean, your father."

"I am the child of the nomad," Xia Zuo laughed.

"Okay, congratulations to Xia Zuo, I'll officially promote you to a second-year student in the Mechanical Department, wait for me!" David smiled and walked towards the door in the distance to the north.

Not long after, David walked out of the small room in the north with a roll of paper, walked to Xia Zuo, and handed over the roll of paper.

"This is your first-class mechanic proof." David said with a smile.

Mechanics is not a fighting profession, but it is also an important profession in social composition. In terms of status, it is comparable to blacksmiths and tailors.

The certificates of the mechanical department are issued by vocational teachers. With the certificate, even if you have not graduated from the college, you can find good jobs at the dock repair factory, shipbuilding factory and other places after leaving the college.

This is an era of prosperity of navigation and commerce, but pirates are rampant. The places where machinery is used most are ship repair factories and shipyards. Although first-level mechanics are only stronger than apprentices, they can definitely find a job as long as they leave the academy.

It is said that David is a seventh-level mechanic and once participated in the design of the Queen's fleet flagship "The Queen of the Royals" when she traveled. Mechanics of this level are also a popular talent in the Steam Alliance.

"Have you read the second grade books?" David asked with a smile.

"No!" Xia Zuo shook his head.

Next, Xia Zuo spent the whole afternoon reading books. He had never been exposed to the second-year books in the Mechanical Department. In fact, if you want to read books, not only in the college library, but also in the bookstore outside. Xia Zuo has the ability to not register for the Mechanical Department, but also in the high-end mechanical books, although they are all expensive.

However, Charzo's purpose is not here. The Royal Academy Library is the largest library in England. Its books on machinery are the top and cannot be bought outside.

And Lei is the best books.

What Xia Zuo needs to do now is to keep taking the exam until he upgrades himself to fifth grade and has the right to borrow any books in the library's science and technology area.

At night, Xia Zuo hurried back to the wooden house with his book.

"Lei, what are you doing?" As soon as Xia Zuo entered the wooden house, he saw Lei's tall body sitting on a small stool in the corner, holding a slender steel pipe in his right hand, and his left hand had become a cutting tool, and he was fiddling with something on the steel pipe.

"It's nothing, it's boring, make something!" Lei said with a dead face.

"Come here, help me, I can't understand this paragraph..." Xia Zuo opened the book in his hand impatiently, greeted Lei, and walked to the side of **.

When he was in the Mechanical Hall, David seemed to be conquering some technical problems. He looked frowning all afternoon. Although Xia Zuo, who was reading, had many questions in his heart, he had no nerve to disturb him, so he came back to ask Lei.

As an artificial human, the thunder is the pinnacle of human mechanical wisdom. Its ability to understand mechanical science and knowledge reserves can no longer be measured by level. For Xia Zuo's questions, Lei can already be answered in the simplest words and directly points to the core of the problem.

Under Lei's guidance, Xia Zuo has made great progress, which is so fast that ordinary people can't understand.

Lei likes to answer Xia Zuo’s questions very much, and never shows an impatient look, because this is not only helping Xia Zuo, but also helping himself.

Ten days later, early morning.

Xia Zuo, who had just slept very late last night, opened his eyes on time, rubbed his eyes, and looked at the sky outside the window, and was immediately sleepy. He seemed to remember something.

Taking a shower, putting on my clothes, and holding up a thick stack of books, Xia Zuo knocked on the ** board.

"I'm leaving, thunder!" Xia Zuo finished speaking and walked out the door.

"Yes!" The thunder under the ** responded, opened his eyes and slowly closed them.

Artificial humans do not need to sleep, but in Lei's situation at this time, he needs to rest, so whenever Xia Zuo sleeps, he will lie down and let his body enter a shallow dormant state, so that he can better absorb free energy in the air.

After leaving the wooden house in a hurry, Xia Zuo came to the underground machinery hall.

The lights were still dim, and it was still in that corner. After the large generator, several classmates had already arrived and started learning under David's arrangement.

"Here, read the book!" David looked up at Xia Zuo, said casually, lowered his head again, and studied the hybrid engine in front of him.

This is an extremely difficult technical problem. Before Xia Zuo came, he was studying it. It has been a month since he was having a headache every day.

"Teacher, I want to take the exam!" Xia Zuo looked a little excited, handed a thick stack of books to David, and said, "I have finished reading all these."

"Don't you review the grade exam?" David looked at Xia Zuo blankly.

"No need for teacher, I want to take the exam!" Xia Zuo smiled, but said solemnly.

He was very anxious. For mechanical science, Xia Zuo first started to come into contact with it because of Lei, and began to understand it from the perspective of artificial humans, but now it was because of interest, and Xia Zuo could no longer extricate himself.

"Go, on the second table over there, put all the parts in different boxes according to the labels, assemble a steam engine for me for the remaining parts, and the small generator inside the table is also broken, fix it. Be careful not to make any mistakes. Any mistakes will fail the grading exam." David said.

Compared to the last grading exam, this time it is much more complicated and the difficulty has been improved by several levels.

Xia Zuo walked to the table and looked at the hundreds of parts all over the table, the generators on the inside of the table and dozens of various small bottles, and he felt a little dizzy.

After concentrating slightly, Xia Zuo moved.

"Hehe, there's a good show." Alan, a fourth-grade, supported his eyes on his nose and whispered to the Bell brothers beside him.

Hoves and Fernan, both of whom were sixteen years old, had their last name Bell, so they were called Bell Brothers.

"Uncle always gives people difficulties," Hoves whispered, glanced at David lightly.

Yes, he and Fernan were David's nephews. They were able to become level 4 mechanics at the age of sixteen. Most of these were due to their childhood influence. Their entire family was engaged in mechanical work, and these two were the most talented mechanics in the family's history.

David had the idea of ​​sending them to Steam Alliance for further studies, but it seemed difficult.

For twenty minutes, Xia Zuo was full of jingling sounds. After a few minutes of silence, it lasted for a long time before completely stopping.

"Teacher." Xia Zuo turned around.

"You've done it all?" David raised his head and said.

"No...no..." Xia Zuo said slowly, slowly turned his head to look at the steam engine that had been assembled in front of him, and frowned deeply, "Teacher, the generator has been repaired and the parts have been divided, but... this engine seems to have missing parts."

"What's missing?" David stood up.

"The rubber pad of the inner pressure valve, the round one..." Xia Zuo raised his hand and gestured. It was a very small thing.

Slap!

David slapped his hands twice and smiled on his face: "Very good, Xia Zuo."

After walking over and checking the generator and the box containing the parts, David looked at the steam engine that had been assembled, took out the rubber pads needed by Xia Zuo from his pocket, and said with a smile: "Put it!"

In front of David, Xia Zuo quickly assembled the steam engine, put down the wrench, and looked at David again.

"Teacher, give it a try?" Xia Zuo said.

"No need, I've seen it all!" David shook his head, paused and said with a smile: "Congratulations, Xia Zuo, I'm officially promoted to a third-year student in the Department of Mechanics."

Take out the certificate of the second-level mechanic from the small room in the north and hand it to Xia Zuo. David patted Xia Zuo on the shoulder heavily, and said with a serious smile: "Study hard, I think of you. If you can become a fifth-level mechanic within two years, I will find a way to send you and Hoves to the Steam Alliance for further study, work hard!"

In fact, David has always been surprised, surprised Xia Zuo's learning speed and his desire for knowledge, but these are not enough to make David make a promise. He has seen geniuses before, but he has two of them. What he values ​​more is Xia Zuo's hard work.

In the morning, after the grading exam, Xia Zuo left the Mechanical Hall and studied other courses. He did not return to the Mechanical Hall again until three o'clock in the afternoon.

Four o'clock in the afternoon, dusk.

The underground machinery hall has no windows, and naturally there is no sunshine. The lights are on and it is still dim.

Xia Zuo, who had been reading for a long time, raised his head, rubbed his sore neck, and glanced at David beside him.

David was also studying hybrid engines there. In fact, hybrid engines have long been developed by the Steam Alliance and widely used throughout the world. It is not a particularly difficult technology, but... all hybrid engines used in the world today are super large and mainly used in ships.

What David is now studying is a small hybrid engine. Although it is a transition from large to small, it sounds simple, but in fact it is exactly the opposite, not an ordinary difficulty.

"Teacher, why not add three return air pipes to it? Remove the middle interval and change the cover on it to Ross No. 3 aluminum alloy with higher hardness. The cover can be made into a raised shape." Xia Zuo moved a small stool and leaned towards David, pointing to the hybrid engine where the cover had been removed.

"No, if three return air pipes are added, although the return air will not be in danger of blowing up the chamber, the passage space will be reduced and the steam input flow will be insufficient..." David, who was upset, scolded him because the research has not been broken through.

"However, removing the interval and making the cover bulge will add about 20% of the circulation space, which should... be enough..." Xia Zuo argued loudly, but his voice became smaller and smaller.

It’s not that he lacks confidence, but that he saw that David’s face was not right.

...
Chapter completed!