As the king of Tubo, he asked the Tang Dynasty to marry the princess, but Li Jing refused, but asked the king of Tubo to marry the princess of Tubo into the Tang Dynasty.

Li Jing sent people to the Champa Kingdom and asked the king of Champa for two crops of rice seeds to come back and plant.

The second imperial examination is underway, and Li Jing is not idle, but asks people to secretly investigate whether there is anyone from Yangtong in Chang'an.

If you can win over Yang Tong, and support Yang Tong to grow, use Yang Tong to contain and weaken the strength of Tubo, and prepare for further taking Tubo!

Li Jing was holding a recital in his hand, which was the left servant of Shangshu shooting Liu Bowen to Li Jing playing a recital about the steam train.

In order to better manage railway affairs, Li Jing set up a new yamen under the Ministry of Industry, which was mainly responsible for managing railway affairs, and this yamen was called the Railway Division.

Since there is a steam train, it is much easier to travel and transport, but since there is only one train, there is only one train a day between Chang'an and Dongdu, which is simply not enough!

However, if you add one more train on the same track, it is prone to accidents, which will cause personal safety of passengers and loss of goods.

The Ministry of Industry agreed to the approval of the Ministry of Industry, but after the approval reached the Ministry of Households, the Ministry of Households rejected the request of the Railway Department on the grounds that there was no money.

The Ministry of Industry reported the matter to Shangshu Province, and after Liu Bowen read it, he attached great importance to this matter and immediately convened everyone to discuss a solution.

But no matter how much we discuss, there are only a few more railways to maintain the normal operation of the steam train, if there is only one, it is too inconvenient, if the train has a problem, it will affect the normal departure.

But the household department really couldn't come up with so much money, Li Jing spent a lot of money in order to buy barley wine, and now there is no way to come up with the money, even if there is only one railway, it can't be repaired, let alone add a few more.

Isn't this a dilemma? The reason why it is difficult for a good woman to cook without rice, don't you know it?

After listening to this, everyone is at a loss for this!

In the end, it was Liu Bowen who decided to give Li Jing a fold to see if Li Jing could solve this problem, after all, the steam train was made by Li Jing.

After Li Jing finished reading the recital, he threw it aside, he had a way to solve the problem of the steam train, and he could use a telegraph to contact the platform and the train.

In this way, if you add a few more trains, there will be no collisions, etc., and you can maintain a safe distance between the two trains, ensuring that you can travel safely.

Before that, though, it's important to solve the problem of the telegraph.

Li Jing took out the encyclopedia from the space system, and found the graphics and texts about the production of telegraphs, as well as the parts and components made in it, all of which were clearly recorded!

Li Jing immediately started to draw a few drawings of the telegraph, and the parts were made separately, so as not to be stolen, and handed it to Ximen Yang on the side: "Send this to the Ministry of Industry and let the craftsmen build it separately!" ”

"Whoa!"

Ximen Yang respectfully took the drawings handed by Li Jing and asked, "What about Liu Xiangye?" ”

"Let him wait!"

Li Jing said coldly.

Ximen Yang respectfully retreated, sent the drawings to the Ministry of Industry, and passed Li Jing's words to the people in the Ministry of Industry.

The craftsmen were divided into three batches, and according to Li Jing's instructions, they each got a drawing and made parts separately.

It wasn't until the afternoon that all the things Li Jing asked for were delivered, and Li Jing began to assemble the telegraph.

The telegraph consists of a transmitter and a receiver, and by pressing the transmitter's transmitting button, a fixed frequency radio signal is emitted through the antenna all the way.

After receiving the radio signal, the antenna of the receiver drives the buzzer to chirp and the diode to emit light to realize the transmission of information.

Of course, these are not enough, the telegraph transmits information through electromagnetism, and without electricity it is simply impossible to transmit information.

Li Jing found the method of manufacturing batteries from the encyclopedia, picked up a pen and paper, and wrote down the materials needed to make the battery.

"Go and prepare all these materials for this king!"

Li Jing handed over the material sheet to Ximenyang and asked Ximenyang to prepare all the materials written on it.

Ximen Yang took the order and went to the Ministry of Industry to ask the Ministry of Industry to find materials.

The Ministry of Engineering took the order and prepared the materials according to the list.

In fact, the material of voltaic batteries is not so difficult to find, voltaic batteries are composed of multiple layers of silver and zinc, which are spaced with substances impregnated with water.

The materials were quickly delivered to Li Jing, who immediately assembled them, and after many experiments, the power generated by the voltaic battery could be used on the telegraph.

With the battery supplying current, the telegraph can really be used and can transmit electromagnetic signals smoothly.

In order to verify the effect, Li Jing asked Ximenyang to go to the gate of the palace with the telegraph, and he left the telegraph in the hall with the transmitter, and then, after everything was ready, Li Jing immediately sent the first telegram.

As long as the receiver can receive the signal from the transmitter, the buzzer of the receiver will sound, the diode will also light up, and the receiver will print the received information on paper.

"Didi ......"

The buzzer sounds, and the receiver starts to operate normally, printing out the code.

Ximenyang immediately took the code, quickly rushed to the hall, and handed it over to Li Jing.

Li Jing immediately took out the codebook that had been prepared a long time ago and translated it according to the codebook.

The result of the translation is: Zi said: The regent is the first loyal minister of the Tang Dynasty! It is really a blessing for the Tang Dynasty!

When Ximen Yang saw the above content, the corners of his mouth couldn't help twitching, and he knew that his master Li Jing must have some kind of commotion again, and it was not surprising.

I really don't want to have any face!

Li Jing was very satisfied with this, and raised his head and said to Ximenyang: "Go and call Liu Bowen and the Ministry of Industry and the railway envoy to this king!"

"Whoa!"

Ximen Yang led the order to retreat.

Half an hour later, Liu Bowen and the Ministry of Industry and the Railway Department came to Li Jing's mansion together.

"See the Regent!"

The three of them saluted Li Jing with crossed hands!

"No rudeness! Throne!"

Li Jing ordered someone to bring a stool and sit down for them.

Originally, there were no stools in Datang, everyone knelt on a straw mat, which is called sitting on the ground!

Sitting like this for a long time is easy to make the blood in the legs unable to circulate, and eventually leads to the appearance of radish legs, which is too ugly, just like the island country next door where the small life is okay, they are sitting on the ground for a long time, causing them to have Luo circle legs, and they are ugly to death when they walk.

So, Li Jing asked people to make some stools out, which are much more comfortable than kneeling on the straw mat, of course, there will still be some problems after sitting for a long time.

"Thank you, Regent!"

The three of them thanked Li Jing for giving him a seat, and the railway envoy of the railway division had been staring at the telegraph since he came in, and he always felt that Li Jing had called them this time because it had something to do with the object in front of him.

But he couldn't say what the connection was, and what was the purpose of the object in front of him?

"You're curious, why did the king call you?"

Li Jing said with a smile.

"The regent called us here, it should be for the steam train, I wonder if the regent has a good solution to it?"

Liu Bowen said with a smile, calling them at this time, especially when the railway envoys are there, there is only one possibility, and that is the problem of steam trains.

It seems that the regent is confident, otherwise, he would not have called them over!

Li Jing nodded, Liu Bowen's guess was not bad at all, mainly among the three of them, there was an official in charge of railway affairs, and it was not difficult to guess his purpose.

"See that?"

Li Jing stretched out his hand and pointed at the telegraph.

"The Lord Regent means that this object can solve the passage of multiple trains on a railroad without danger?"

The Ministry of Industry Shangshu doesn't believe that the things in front of him can have so much ability to influence the travel of the train, and if you want to say it, you won't be laughed at without being laughed at!

"That's right! To solve the problem of train collisions, as long as timely communication and deployment are done on time, these problems can be solved, and it is also possible to add a few steam trains. ”

"What you see in front of you is called a telegraph, which consists of a transmitter and a receiver, and the telegraph will ......"

Li Jing told them how to communicate on time through the telegraph machine, and covered it up with them on the spot.

The three of them were amazed, they didn't expect that the problem of the century that had besieged them for a long time would be solved like this!

"Dare to ask the Regent, how far can this telegraph go?"

The railway envoy of the railway division hurriedly asked.

"It depends on the power of the transmitter, as long as the power is enough, there is no problem to cover the whole world!"

Li Jing said with a smile, but the power of this telegraph in front of him is limited, and it is impossible to cover the entire world, and how far it can cover is still in the experiment.

As the regent of the Tang Dynasty, he has to take care of every day, and the trivial matter of experimenting with the power of the telegraph machine can't always trouble him?

"This ...... This ......"

The railway envoy of the railway division was shocked and speechless, if it was really as Li Jing said, wouldn't it be the same as the legendary Shunfeng ear?

If this is applied to the military, who else can be the opponent of Datang, to put it bluntly, Datang is the overlord of this world, and the prosperity can be expected!

"Okay, you can take this back and study it carefully, and the specific power of the experiment is how big, how far is the reporting distance, and put it into use as soon as possible."

"The Ministry of Industry has to keep an eye on it, it must not be leaked out, if it is known to the enemy country, it will definitely come to rob it, if it falls into the hands of the enemy country, it will add a lot of trouble to Datang!"

Li Jing said: By elevating the telegraph to the top military secret, all those who are in possession of the telegraph must strictly investigate their identities, and no contact should be made between the sender, the receiver, and the person who interprets the code.

"The minister understands!"

The Ministry of Industry Shangshu saluted and replied, he could see the seriousness of the matter from Li Jing's solemn and serious face, he would never leak such secrets, even his family would never reveal half a word!