"And such magical things? Easy to do? Li Longji understood it.

Something called a telegram, two people are far apart, and they can transmit information to each other, almost in the blink of an eye.

"It's not easy to do, without a triode, the transmission distance is limited, and a telegraph receiving station needs to be set up on the middle road."

Li Yi shook his head slightly, researching semiconductors is to increase the transmission distance of telegraph signals.

Otherwise, a point is set up dozens of kilometers away, and the front one is sent over, and this point is received, and it can be sent out again without translation.

Successive deliveries and finally arrival at the destination.

This speed is actually quite fast, at least faster than riding a horse.

The disadvantage is that there are too many transfer stations, and if there is a problem with one of them, the information will be inaccurate.

"How long will it take?" Li Longji was eager again.

"It's a year if it's fast, it's two or three years if it's slow, it's easy to say. Mainly electronic components, otherwise I'll make you a simple one right now, with a battery. ”

Li Yi has a simple method of making a telegraph, and there is no need to amplify the signal.

"More technical than surveillance?" Li Longji remembered the set in the palace and the set of surveillance in Zhuangzi.

Li Yi's eyes widened and he shook his head vigorously: "It's too much, give me ten years, and I won't be able to make that set of things." ”

If he had reached the level of technology to make that surveillance device, he would have built the atomic bomb long ago.

How many basic industries are involved?

No, there is no need to build an atomic bomb, the arsenal comes out, makes rifles of the AK series, and recreates bullets.

There is no need for artillery, thousands of people, and each person can play with an AK to destroy the country.

"Oh~!" Li Longji regretted it, he very much hoped that there would be more of that thing, and then monitor the entire Chang'an.

If the distance can be farther away, throw it directly to the Metropolitan Mansion.

He didn't know that what he was thinking was used by Li Yi at that time.

Install a monitor in your home, and as long as there is a signal, you can see it on your mobile phone no matter where you are.

"At present, it is still important to build a post station, even if there is a telegraph, it is only to transmit news, and the post station has a greater role in the military and people's livelihood."

Li Yi is not ambitious, starting from the basics, Datang does not need technology to be a post station.

"It should be ready for construction by the fall, and at the same time the newspapers around the country will be officially launched."

Speaking of this, Li Longji seemed to be in a good mood.

Datang is paving a post station, and other places are a little slower, and the border pass is estimated to be about the same.

At the same time, the best horses were assigned to the post station from the border pass to Chang'an, and the news was transmitted by using the extreme sprint speed of each horse.

Where the horse can't go, test the sprint speed of the postman, what the postman needs to do is run from one point to another, and there is no strength when he arrives at the place.

Hand in the letter, and this post relay runs.

Of course, it can't be a person every time, in case you fall along the way, get bitten by a snake, and call a tiger to bite you......

"If you want to sell the goods to the Wa Kingdom, Brother Yi, you can talk about it." Li Longji knew about currency and was ready to trade with the Japanese state.

The first time I went, bartered.

"Li Zhuangzi's tea leaves, embroidery, better kitchen knives, short curved ploughs, soap, rock sugar, chili noodles, dried carrots."

Li Yi thought about it and said a few things.

Li Longji didn't care about anything else, but he had thoughts about the plow: "Give them good farm tools? ”

"Trade must be led by the Japanese people, replenish fresh water in some places, and then go to Pingchengjing."

Li Yi explained the reason, the things used by the people of the Tang Dynasty, I believe that the envoys of various states and countries have already collected them, don't you say that they don't give them back?

It can limit physical objects, but it can't erase memories.

Since you can't stop it, it's better to be generous.

Today, the capital of the Wa Kingdom is in Nara City, and it is necessary to bypass the island of Kyushu.

There are coal mines on the island of Kyushu, and another place with many coal mines is in Hokkaido.

On the island of Kyushu, there is a place dedicated to receiving envoys from other countries, Fukuoka Prefecture, which is also a military location.

However, trading with Kyushu Island does not make much money, and Heijokyo is the key place.

It was transported by sea to the place called Osaka by Li Yi in the nearby Gyeonggi District, and then by land for dozens of miles, the east and west could be transported to the capital of the Japanese Kingdom.

There is such as Jingzhao Mansion in the Tang Dynasty, and the people are relatively rich.

"Something." Li Longji is indispensable, anyway, Li Yi said that if you prepare these goods, you can prepare.

"Copper, silver, and ore are also acceptable, and the price is adjusted, as well as raw silk, cooked silk, and silk fabrics from the Wa Kingdom."

Li Yi gives what is needed.

The smelting technology and embroidery technology of the Wa Kingdom are not good now, and history records that for the next few decades, it is all such a trade.

The Wa Kingdom spun silk into cloth and exchanged it for embroidery in the Tang Dynasty.

Copper is also given to Datang, in exchange for Datang's copper coins, Kaiyuan Tongbao.

Silver is even more so, technology is not good, and trade suffers.

Thinking that the Wa Kingdom was willing to exchange for Yuan Tongbao, Li Yi added: "I brought Zhuangzi's exchange coupon to the past, and the exchange coupon is also very exquisite. ”

"They won't ask for it, will they?" Li Longji felt that other countries would give them paper money, but he would not want it.

"Send it for free, wait for the next shipment to pass, and allow them to use the voucher to buy something." Li Yi thought of a good way.

The exchange voucher was sent over, and the Japanese people were curious with the assurance, and the money was written on it.

The point is that banknotes look good and others can't imitate them.

And then know that the next time you can use it to buy Datang items, will you try to trade it yourself?

Even if they are not traded, the banknotes will not be thrown away.

The next time Datang goes, people with banknotes are allowed to buy things, and the credit of banknotes is guaranteed.

He even brought some merchants and items from the Wa Kingdom to Datang to let them see the role of exchange coupons in Datang.

Li Longji was concerned about this matter, and he learned how to use currency to bully people: "This method is very good. ”

Li Longji got what he wanted and left happily.

Two days later, Li Longji formally received the envoys of the Japanese state.

The Wa Kingdom was not a subject state of the Tang Dynasty, so the national letters were equal.

The envoy sent something, and Li Longji gave it back and rewarded the envoy.

Next, the banquet continued, everyone ate and drank, and Li Longji asked some things about the Japanese state.

At the end of the banquet, the envoys of the Japanese Kingdom returned to the Sifang Pavilion, and they were very happy one by one.

Datang is still good, and the emperor of Datang is also kind, so let's take the next step.

Find the person in charge and ask for a letter to the prime minister and say something.

They are in a hurry and want to identify some technologies as soon as possible.

They didn't count on gunpowder, it was used for war, and the formula could not be given to their own country.

It should be okay to print this, right? said that he would go back to print the books and Buddhist scriptures of the Tang Dynasty.

I don't know if the hot air balloon can be given, what reason is it? Said it was flying from Japan to Datang? Fast message delivery?

In addition, it is best to send someone to teach yourself and others, and reading books is not as good as someone to teach you.

Ask Li Yi again if he is willing to send Japanese envoys to Japan as an envoy of the Tang Dynasty to Japan for exchanges.

When passing through Henan Province, a new kind of rice is being planted in the local area, and it is said that the maturity period is short, so get a boatload of seeds back?

With these thoughts in mind, Abe Nakamaro wrote a letter to Song Jing, which was handed over by the official.

When Song Jing saw the letter, he shook his head helplessly: "It's too beautiful to think about, Li Yi won't agree." ”