Li Shimin thought that Li You mentioned about manipulation of currency in the letter was an extremely important matter. He wanted to listen to Li You's opinions in person. Of course, this was just a reason. He really wanted to see his son in his heart.

Thinking of this, Li Shimin immediately ordered people to send him to Kabul to send an order and let Li You return to Chang'an.

After the Tang army destroyed the Feituo Kingdom, the border patrol team of Tusfan appeared on the opposite side of the Darobi Tu people, and suddenly became Tang people overnight. They were very surprised.

The soldiers of the Tang Dynasty escorted the envoys of the Tang Dynasty. After the consent of the Tusfan people, they entered the Tusfan border and headed to Lhasa.

Songzanganbu saw that the Tang Dynasty had become a fait accompli, and he had no choice but to do anything about it.

The Feituo Kingdom was originally the main channel for trade and trade between Tusfan and Tianzhu, but now the channel was blocked by the Tang Dynasty. They had to accept Li You's suggestion and trade with the Tang Dynasty.

Li You invited the Tusfan people to continue to maintain economic and trade exchanges with the newly established Baiji Stan area and the Angot Province area.

The newly established trade channel of the Tang Dynasty continued to be opened to the Tusfan people, and at the same time, the trade channel of the Tang Dynasty was opened to the Tang Dynasty. Therefore, from the town, you can go directly to Chang'an through Tusfan, which was nearly 1/3 shorter than the Silk Road passing through the Western Regions.

This will greatly deepen the trade exchanges between the Tang Dynasty and the six major countries in India.

At this point, the Tang Dynasty and Tusfan remained in peace.

The Tianzhu Kingdom was a little angry that the Tang Dynasty occupied their vassal states, so they provoked trouble on the border. As a result, under the counterattack of the Tang army, who was ready to fight, they finally gave up their attempt to retake the Feituo Kingdom.

Then Wang Xuance went to the Kingdom of Heaven and reached a trade agreement with the King of Heaven.

At this point, the Tang Dynasty and the Tianzhu Kingdom also remained in peace.

Li You decided to spend a year to digest the newly occupied areas and not expand to the outside world for the time being. The situation stabilized.

Kabul City.

The military and political officials were worried about the affairs of Baji Stan and Angot Province, so Li You got free.

While accompanying his wife to enjoy the food, Li You focused his main energy on studying radio communications.

This matter is too difficult, mainly because the industrial foundation in Kabul is too poor and even a single copper wire cannot be processed.

Li You organized a large number of craftsmen to achieve his goals bit by bit.

Through Li You's teaching, the students of the wireless telecommunications training class showed a new world of technology in front of them, which greatly aroused their enthusiasm for studying science and technology. In addition to studying, they worked with craftsmen to study and create the telecommunications equipment that Li You mentioned according to the drawings drawn by Li You.

Manufacturing a radio station is not something that can be achieved overnight. Li You first needs to deepen the students and craftsmen's understanding of electricity.

On that day, Baihu brought a set of expensive glass tea sets to the craftsmen's workshop. Baihu also brought a set of drawings and related instructions with him.

Baihu said, "The prince has told you to process the glass into what you said on the drawings."

"This?" The craftsmen were all very surprised. This set of crystal-clear glassware was definitely valuable. The prince actually asked them to process it into the half-gourd-shaped thing on the drawing. This is too much of a waste. Well, is it a waste?

Seeing the craftsmen hesitate, Baihu said, "You can do it boldly. The prince said that this set of glassware is for you to practice. If it is not enough, I will send it to you again."

There is no glass factory in Kabul, so Li You can only let the craftsmen melt the glassware he brought.

Baihu said it very well, but the craftsmen did not dare to make a fortune like this. They carefully studied the drawings, hoping to save materials to the greatest extent.

On this day, the people in the Kabul Governor's Palace were very excited, and they were looking forward to a miracle.

In the guest room next to the meeting hall, Li Duan and others were fiddling with a machine.

This machine is the same as the world's first motor, the Faraday disc motor, which used electromagnetic induction light shortly after Faraday's electromagnetic induction phenomenon in 1831.

This motor structure is different from modern motors. In the magnetic field, it is not a coil, but a disk made of copper. A rocker is fixed at the center of the circle, and the edges and centers of the circle are each closely connected to a brass brush, and the brush is connected to the ammeter with a wire. The copper disk is placed in the magnetic field of the hoof magnet.

When the shake handle is rotated to rotate the copper disc, the pointer of the ammeter is tilted to one side, which means that a continuous current is generated in the circuit.

Two wires were connected to the machine, through the crack of the window in the guest room, and connected to the conference hall. On the beam on the roof of the conference hall, several things Li You called light bulbs hung.

This thing is the light bulb that the White Tiger asked the craftsmen to process.

Li You can't make a tungsten wire lamp now, so he can only imitate the Momoji lamp made by Edison back then. However, this lamp is already very powerful and can be lit up for thousands of hours in a row.

At this moment, in the conference hall, Li You and his wives, Cheng Yaojin, Ma Zhou, Abu Hassan and others, as well as officials from all over the palace. These people did not go home after work, and stayed in the conference hall, waiting for the miracle to appear.

At this time, the sky was not completely dark. Abu Hassan was anxious and ordered the servants to pull up all the curtains of the doors and windows, and the meeting hall was suddenly dark.

Not long after, a light came through the door, and Li Duan opened the door and came in. He said, "Prince, I'm ready."

Li You said, "Then let's start."

"Yes, Prince." Li Duan stepped out and closed the door casually. The room was pitch black again.

Suddenly, the lights hanging on the beams of the room were on, and the room suddenly seemed to be like daylight.

Under the strong light of incandescent lamps, people who are used to using dim lights of candles at night cannot adapt at once, and many people involuntarily covered or closed their eyes.

Cheng Yaojin was not afraid. He stared at the light bulbs on the roof in surprise.

"It's successful." The students in the wireless telecommunications study class and the craftsmen who participated in the development of electric lights cheered first.

Then, the people in the chamber burst into warm applause and cheers.

The magic of turning into daylight at night quickly spread throughout Kabul. People with strong and strong ties have tried every means to enter the Governor's Mansion to see it.

Many people have been looking for Abu Hassan these days, hoping to see the magic of the electric lights. Abu Hassan soon fell out of trouble, so he simply asked the craftsmen to erect a flagpole in front of the Governor's Mansion and hang an electric light on it to let the people see enough.

For many days, at night, there were crowds of people in front of the Governor's Mansion, and this craze lasted for a long time.

The successful development of the electric light greatly aroused the enthusiasm of the students and craftsmen in the radio and telecommunications learning class. Under the guidance of Li You, he further worked towards the development of the radio station.

On the eve of the Lantern Festival, Li You received an imperial edict from Li Shimin to return to Chang'an.
Chapter completed!