A real phone is a hundred times more complicated than a microphone.

Magnets, wires, and diaphragms can all be made, but this circuit board stumped Tong Xuan all of a sudden.

Nowadays, he has a lot of talents under his hands, especially this time in the imperial examination, a large number of jinshi do not go to the Hanlin Academy, and they are scrambling to ask to go to the Academy of Sciences, and most of them ask to go to the electric power laboratory.

Even if you don't give an official position, you don't have a rank, it doesn't matter!

Even though the students have been studying the Four Books and the Five Classics for more than ten years, they have been instilled with Confucianism since childhood, and they regard these inventions as strange skills, but the emergence of electric lights has completely subverted everyone's cognition.

Xu Pu, a talented son of Nanzhili, the champion hand-picked by Zhu Qizhen, still resolutely did not enter the Hanlin Academy, and he didn't want to go to the electric power laboratory.

When Tong Xuan was tinkering with the microphone, he was on the side and told the record of listening to Weng in the Mozi book.

However, when he saw the new drawings, sure enough...... Silence.

"Forgive me for being a shallow learner, this thing ...... What is it? ”

Tong Xuan smiled bitterly: "This is called a telephone. ”

Xu Pu asked again: "Telephone...... What is it? ”

"You can understand it as a tailwind ear, or it can be said to be a microphone at any distance."

"...... Unlimited Distance"

Xu Pu was silent again because he didn't understand.

"In other words, if one end is in Beijing and the other end is in Nanjing, you can also send a message directly?"

After a while, Tong Xuan said, "Theoretically! ”

The speed of the conversation between the two is slow, because every word they say has to think for a long time.

Xu Pu tried to make a suggestion: "We can gradually extend the copper wire and test the sound transmission effect of each length." ”

Tong Xuan asked, "If it's really that simple, why does the emperor still have such a complicated drawing?" What are these parts used for? ”

Xu Pu was silent again for a long time, then shook his head.

Tong Xuan sighed and said, "Now that the scale of the power team is getting bigger and bigger, there are more and more new topics coming with it. ”

I think that at the beginning, the people in the electric power laboratory were all gone, and he was left with a light pole commander, but now it is good, under the rapid expansion, it has grown to 120 people, and there are 16 topics related to electricity, and he is the team leader who even eats and sleeps every day thinking about experiments, and he is physically and mentally exhausted.

Now that he had made another phone call, Tong Xuan felt that he was about to collapse.

The two fell silent again, the air surprisingly quiet.

Xu Pu suddenly raised his head and said, "Tong Hanlin, the subject of the phone call ...... I'll leave it to you! ”

"You?"

Tong Xuan's face was slightly surprised, although Xu Pu had not been coming to the Academy of Sciences for a long time, but he was a new champion, and he didn't need to say much about his quick thinking, not to mention ...... I really don't have the energy anymore.

I remembered that when I was in the Hanlin Academy, I also sneered at the so-called science, and by chance, I became interested in thunder and lightning, so I had a choice in the future.

Tong Xuan thinks that his intelligence and talent are not as good as Xu Pu's, and now that the topic of telephone is black, it is better to give it to him to try, maybe it will have a miraculous effect?

Taking a step back, even if the research can't produce results, the emperor doesn't give a time limit!

Let him take a few people to study it slowly, when the results will be produced, and when will he report to the emperor.

"Yes, yes!"

Tong Xuan nodded emphatically and said: "Set up a telephone research group now, you will be the person in charge, the team members can be selected at will in the Electric Power Research Institute, if there is no suitable one, the scope can be expanded to the entire Academy of Sciences, and then I will go to Dean Bei to ask for someone!" ”

Xu Pu clasped his hands into fists and said, "Obey!" ”

In the afternoon of the same day, the telephone research group hung up the signboard, which was officially established.

Xu Pu didn't choose anyone, but just posted a recruitment announcement outside, and then went back to flip through the book.

The electric light is enough to subvert cognition, and now I have made a phone call again, looking at the drawings on the table, and suddenly I feel that more than ten years of books have been read in vain.

Because in the Four Books and Five Classics, all of them are morality and righteousness, and there has never been any record of natural science.

On the contrary, in miscellaneous books such as Mozi Shu, Ganshi Xingjing, Mengxi Bitan, etc., which are regarded as unpopular, there are many treasures to be discovered.

However, Xu Pu went through all the books, including a large number of peerless and unique books copied by Mei Chun in Nanjing, but there was still no relevant record.

During this time, people came to sign up one after another, but most of them were new science and technology scholars.

Xu Pu doesn't pick, and those who come don't refuse, they all want it.

However, this group is very different from other groups because...... There is no specific research method at all!

The research group of human electric lamps studies the material of the filament, the material of the lampshade, and the process of extracting vacuum...... In short, there is a specific direction.

There is also a battery research group, which mainly studies how to store the generated electricity, which is said to have been quite effective.

However, the telephone research group had no clue.

The only clue is a drawing, but no one can figure out the key to it.

It's almost like starting from scratch, and no one knows how to take the first step.

Xu Pu and the others thought about it for many days to no avail, so they had to bite the bullet and ask the Pope.

Zhu Qizhen recognized this person, so he asked, "Is there anything wrong with the Qing family?" ”

"The minister is stupid, there is something unclear, I have come to ask the emperor for guidance!"

Xu Pu leaned his body low, his face ashamed.

In his cognition, the emperor has a lot of opportunities, how can he have time to tutor himself?

Besides, the emperor has already given the direction of research, but he has never been able to find a solution, which is very embarrassing!

If he hadn't been cornered, he wouldn't have come.

Zhu Qizhen was puzzled: "What is the matter with the Qing family?" ”

"About the drawings of the telephone, the minister...... I don't understand ......."

Xu Pu finally mustered up the courage to say the doubts in his heart.

"Where can't you understand?"

"It's mainly a circuit board, the minister has read all the ancient books, and can't find any records related to it, what is the purpose of this circuit board, and how to make it, please ask the emperor to make it clear!"

"Oh, you're talking about this......"

Zhu Qizhen nodded, then shook his head again, and said, "I don't know either. ”

Xu Pu: ......

Seeing this, Zhu Qizhen had to explain: "I didn't lie to you, I really don't know." ”

Xu Pu was very puzzled, you drew the drawings, and you told me that you didn't know?

What about the crooks?

"I am a ......"

Zhu Qizhen planned to make up a nonsense and racked his brains, but he didn't know how to make it up.

Mengdi, a flash of inspiration flashed in his mind, and he said: "A flip scroll, called Luban Book!" ”

When Xu Pu heard this, he immediately became nervous and asked, "May I ask the emperor, where is this book now?" ”

Zhu Qizhen didn't know where it was, but he was talking nonsense.

Regarding the design drawings of the telephone, he himself does not know the details, only knows the role and general principle of the circuit board, as for how to achieve it, he is not a communication engineering major, and it is normal to not understand!

After thinking about it, I can only find a folklore, or the kind of ancient books that are more mysterious and preferably mythical, and just install them indiscriminately.

Xu Pu believed that it was true, the Luban book can be described as the first strange book in ancient and modern times, and the legend was written by Lu Ban himself, but most of the Luban books circulated in the world are fragments.

Even if these fragments are not from Lu Ban at all, they are made up from folklore.

According to reliable historical records, Lu Ban's original surname was Gongyi, and his name was Ban, because he was a native of Lu, and the world mostly called him Luban.

Lu Ban's life is quite legendary, when he was seven years old, he had the ability to teach himself, and at the age of fifteen he began his own travels after the coming-of-age ceremony, and then apprenticed to his master under the disciple of Ziwei, and in just a few months he has mastered all the skills of the master.

However, his talent was not brought into play, and his lobbying of other countries was useless, and after his self-confidence was frustrated, he chose to go into hiding.

Legend has it that Lu Ban was conscripted to work in the national capital shortly after he got married, because he missed his newlywed wife very much, so he made a wooden kite in his spare time, as long as people rode up and recited a few incantations, the wooden kite could carry him back to his home thousands of miles away to get together with his wife.

His wife was particularly curious about this, and once, when Lu Ban returned home, she secretly rode on the wooden kite, and after reciting the incantations like a gourd, the wooden kite flew into the sky.

However, when Lu Ban's wife was flying in the air, she suddenly gave birth and blood flowed out.

The wooden kite was originally made using a secret method, and as soon as it was tainted by the blood, the mana disappeared suddenly, and Lu Ban's wife fell from a high altitude, with one corpse and two lives.

Lu Ban regretted it and thought that it was all his fault, so he sealed the Lu Ban book.

Since then, the book seems to have been cursed, and if the world learns the contents of the book without authorization, it will inevitably be tainted with one of the lonely, widowed, lonely, lonely, and crippled, commonly known as the lack of a door.

Because, this strange book is also known as "Missing a Door", which is even more mysterious.

When Xu Pu heard that the emperor had learned the drawings from Lu Banshu, he immediately thought of the curse of missing a door, and his expression changed greatly.

Zhu Qizhen said suddenly: "When I saw it at the time, it was already incomplete, and after all these years, it has already been destroyed......"

Xu Pu had to ask again: "Does the emperor still remember, is there a description of the telephone and circuit board recorded in the book?" ”

"This ...... I can't remember......"

Zhu Qizhen could only make excuses and shirk as much as possible.

Xu Pu's brows furrowed, and he said, "Weichen farewell!" ”

"Hey, you'll wait!"

Zhu Qizhen suddenly stopped him and said, "Although I don't remember the records at that time, I ...... What the ancients could make, why is it that today, our generation is helpless, and many of Lu Ban's inventions and creations are not also a flash of inspiration, and there is a feeling? ”

When Xu Pu heard this, he was stunned at first, and then suddenly realized, and said: "Thank you for the emperor's advice!" ”

"Do you understand?"

"Got it!"

Xu Pu nodded and continued: "Please rest assured, the emperor will build a telephone even if he fights for his life!" ”

"Let you study something, why are you still desperate?"

Zhu Qizhen smiled and waved his hand, "You still tell me, how far has the research go?" ”

Xu Pu said: "I'm not afraid of the emperor's jokes, there has been almost no improvement these days." ”

"Nothing at all?"

"The ministers have made some attempts, but they ......"

"Don't babble, just say something!"

"Yes!"

Xu Pu saluted, and then said: "The original idea of the ministers was to enlarge the distance of the microphone, and test it from ten steps, twenty steps, thirty steps, fifty steps, and one hundred steps, and later found that the distance was more than fifty steps, and there was still a sound coming, but it had become very faint and could not be heard clearly at all. ”

"On top of that, as the distance increases, so does the interference, such as when the train is running."

"The ministers have come to the conclusion that just lengthening the copper wire of the microphone will not achieve the desired effect at all."

"So, the minister guessed that the key to the difference between the telephone and the microphone was on that circuit board, but he didn't know the mystery, which was incomprehensible!"

Zhu Qizhen nodded, don't look at the ancients who have never seen anything, this intelligence is no worse than that of later generations.

Like Xu Pu, he is even much stronger than most.

Just rely on a sketch, without any practice, you can guess the crux of the problem.

He's right, if you want to solve the problem of long-distance signaling, it's on the circuit board.

A telephone may look like a microphone, but there is a world of difference between the two.

The microphone is simply transmitted through the medium, while the telephone must first convert the sound into an electrical signal, pass it to the other end through the wire, and then convert the electrical signal into sound to complete the real-time call.

However, he only knows this principle, and he really doesn't understand how to operate it.

"You're right, the circuit board is the key, the record about this circuit board......"

Zhu Qizhen pondered for a long time, then took out a pen and paper and said, "Come close!" ”

"Yes!"

Xu Pu stepped forward and saw Zhu Qizhen draw a rectangle, and then drew a few lines in it, turning around, which was very weird.

"Your Majesty, ...... you are"

"This is the circuit board!"

"Huh?"

"Don't worry, listen to my explanation."

Speaking of this, Zhu Qizhen felt a tingling of his scalp.

I'll explain you a hammer!

I don't understand either!

"Suppose this is a plank with wires on it and the plank is insulated...... In your power group, you should be very clear about what substances conduct electricity and what substances do not, right? ”

Xu Pu nodded and said, "It's roughly clear." ”

"That's good!"

Zhu Qizhen nodded and continued: "If you want to control the current, what should you do? ”

"Power up the wire."

"Very well, then...... What if you are required to be powered from left to right and not from right to left? ”

Xu Pu scratched his head, and then said, "I don't know." ”

"There's going to be a new concept here, called semiconductors."

"Semiconductor...... What is it? ”

"In layman's terms, it is a substance that is between what can and can't."

"Between conducting electricity and not being able to conduct electricity...... What is it? ”

Looking at Xu Pu's blank face, Zhu Qizhen had no choice but to say: "You don't care what it is, in short, there is such a substance, called semiconductors!" ”