In the evening and dinner time, Yuwen Wen looked at a abalone (salted fish) in the dish and was quite surprised: "Oh, today's Donghai abalone is quite big!"

Yuchi Chifan, who was sitting aside, smiled when he saw this: "This is a fish from the black water, not a sea fish from the East China Sea."

"Oh, it turns out it's a new product from Beisi. I said why I haven't seen it before." Yuwen Wen picked up a piece of fish, took a bite, and then said: "That's right, even if you pickle fish, you can eat the meat with good quality."

"Yes, it is said that every autumn, many sea fish enter the black water and then swim upstream. At this time, the meat of these fish is the best."

Yuchi Chifan said, hesitating: "This fish is called...it is called...it seems to be called 'Maha' by the locals..."

Yuwen Wen added: "It is a salmon, pronunciation from what the locals call 'Dayimaha', which means a fish that appears regularly. Does Sanniang know why this is?"

Seeing Yuchi Chifan shook his head, he said, "This is because these fish have to go back to their hometowns upstream of the Black Water to lay eggs and reproduce offspring, so they have to leave the sea and migrate to the Tamsui River every autumn."

After spitting out a thorn, Yuwen Wen continued: "The various tribes of the Black Water Marine live a life of fishing and hunting, so fish catches in the river are very important to them. After a long time, they observed the habits of this fish."

"This salmon, born in the Tamsui River, grew up a little, went down the river and went down the sea, surfing in the sea, growing up, getting married, and in autumn, we went upstream with our partners and companions and returned to our hometown."

"When entering the river, the fish was strong and strong. After trekking thousands of miles back to their hometown, they were so tired that they were skin and bones. They died after laying fish eggs. After the fish hatched, they continued their parents' life journey, generation after generation."

Listening to Yuwen Wen's "Popular Science", Yuchi Chifan suddenly felt that these "salmons" were not easy. Such a difficult "road to return home" was caught when it started. Is the ending a bit miserable?

"How can I catch all the fish? Beishi has developed in the Hei Shui River Basin. In addition to its valuable fur, it has to find some resources that can make a profit."

"Besides, the strongholds in the Blackwater Basin need to store food for the winter. Isn't it just right to use salmon locally?"

While eating, Yuwen Wen chatted with Yuchi Chifan. As he chatted, he talked about the "New World".

Yuwen Wen is full of confidence in the New World and is sure that he can find various economic crops and abundant mineral resources, because this is a "historical fact", but it cannot be explained clearly, so he talks in general:

"There must be good things in that place, but I just can't find them all at once. If you wait patiently for a few years, there will definitely be good news."

"Erlang, are there really any survivors of the Shang Dynasty in that place?"

"No one can confirm it, so we need to continue exploring."

Not long ago, Yuwen Wen announced in the Political Affairs Hall that he would pay out of his own pocket to support the exploration of the New World. For this reason, Beiyang Trading Company began to plan to establish a branch collar (branch) to be specifically responsible for the exploration and development of the New World.

This semicolon will raise private funds to support a great exploration that seems to be unrecognizable.

The money Yuwen Wen wants to pay is not a small amount, of course, it must be checked by Yuchi Chifan. As the "inner leader", she must ask Yuwen Wen for some "insider information" before she can rest assured.

Now that Yuwen Wen said there will be, there will be there.

With the bottom of this, Yuchi Chifan can promote the "opportunities" of the new continent to the outside world. Only in this way can all the "internal leaders" take out their money and "raise funds" to explore the new continent together.

Yuwen Wen actually wanted to tell his wife what was in the New World, but he still held back because he couldn't "justify himself".

But the answer is there. Whether the problem can be solved is nothing more than a matter of time. Therefore, the money has been made and no matter how much money you invest, you won’t lose. At present, I can only pat my chest and assure my wife that this investment is “stable profit”.

As he spoke, Yuchi Chifan talked about telegrams. Since the telegram line between Chang'an and Luoyang was pulled up, the transmission of ordinary official information was much more convenient, and the "Telecommunication Bureau" also took into account private business, which is "both public and private".

This move is not only for the convenience of the people, but also for the strong demand for private "communication" to obtain income, fill in the high costs of setting up, using and maintaining telegram lines.

Yuchi Chifan sighed as he spoke: "It is indeed much more convenient to have telegrams, but one line can only be sent on one end and the other end, and cannot send telegrams to the other end at the same time. The efficiency is too low. Many people are impatient and simply send people to ride horses to Luoyang to send messages."

"Who said no? The telegraph wire is like a single-plank bridge, which can only allow one person to pass at a time." Yuwen Wen sighed as he said, "Oh, just make do with it, it's better than it is, right?"

......

At night, the bedroom, Yuwen Wen used a teaching model to explain to Chen Wu what a "telecommunication" is. The model structure is very simple, it is a battery-powered DC circuit with a knife switch, an electromagnet, and a wind-driven paper pulley connected in series.

Close the switch, the circuit is connected, and the current passes through the electromagnet, causing the electromagnet to become magnetic. The armature on the top of the electromagnet is sucked down, and the charcoal pen sandwiched at the end of the armature will leave traces on the rotating strip.

When the switch is turned off, the circuit is interrupted, the electromagnetic will lose its magnetism, the armature will rise (curve), the charcoal pen will leave the paper strip, and the traces will be interrupted.

A short opening and closing switch can leave dot marks on the paper tape, which is a "point"; if you close the switch and wait for a second or two before disconnecting, the armature charcoal will leave a horizontal line on the paper tape, that is, "scratch".

"Points" and "Slashes" constitute the most basic telegram information unit. These two units can form ten numbers 0~9, and the encoding of four numbers in a group can correspond to different characters.

Therefore, the sending terminal (blade switch) can send information to the receiving terminal (electromagnet). If the distance between the two is extended, one end is Chang'an and the other end is Luoyang, then long-distance information transmission is realized between Chang'an and Luoyang.

Yuwen Wen's explanation was simple and clear. Chen Hua quickly understood that she had recovered from postpartum and was now fiddling with the telegraph teaching model and constantly asking various questions.

The questions asked by Chen Hua sounded very simple to Yuwen Wen. He was familiar with the various technical issues of telegraphs. However, his dreams that were more than 20 years ago have not been truly realized. As he thought about them, he felt a little depressed.

If the telegram really achieves a breakthrough, it means that the center can better control the frontiers, offset the "centrifugal force" of the frontier areas within the huge territory, and improve administrative efficiency, which is very helpful for improving national strength.

However, telegraph technology encountered a bottleneck, and it was no longer possible to rely on a few technical teams to "research" the problem. Therefore, Yuwen Wen decided to let go of this secret and let more people participate in telegraph research.

Not only Chang'an, Xiyang, and the provincial schools located in Chengdu, Jinyang, Luoyang, Yecheng, Xiangyang, Jiangling and Guangling have all opened "electrical science" courses to teach electronics knowledge to interested students and provide experimental places to allow students to do experiments to cultivate talents.

Telegram models are common electrical teaching tools, so telegram is not a magical power for people who are interested in studying electricity.

Yuwen Wen was not worried that the leak of confidentiality would cause the spread of technology and was used by other countries to deal with him, because if you don’t talk about other countries, just talking about batteries and long-distance wires, other countries can’t learn it.

"Erlang, how will this telegram be transmitted hundreds of miles away? The 'resistance' mentioned just now will cause the current to become weaker. Will the current become weaker for a distance of hundreds of miles so that it cannot make the electromagnet magnetic?"

Yuwen Wen had answered Chen Hua's questions many times before, and answered them to other beauties because he also "popularized" the principles of telegrams to others.

But that happened many years ago. It was not until now that Yuwen Wen remembered to give "popular science" to Chen Hua, who was "backward", so it was natural that Chen Hua, who was just beginning to get into the principle of telegraph, asked this question.

"This question is good, so there are two ways to transmit telegram signals from a long distance. The first is to increase the initial current and connect more batteries in series to carry over the loss of the line, so that the current can be transmitted to the other end of the line, and drive the electromagnet."

"Secondly, like a station, there are multiple stations on one line. In fact, between each station, there are independent telegram lines."

"The telegram signal sent from Chang'an was transmitted to Tongguan. The telegram sender and receiver at Tongguan Station recorded the content of the telegram, then pressed the electric key to transmit the content to the Shanzhou Station, and then one by one station relayed to transmit the content of the telegram to Luoyang."

"The principle is the same as the official document for relay transmission of the post station. Of course, relay transmission will cause a 'delay' of the telegram transmission time. For example, the existing telegram lines today, except for the one that crosses the sea, the other ones are transmitted by relay stations."

"Oh..." Chen Hua nodded, looked at the three teaching models on the table, and fell into deep thought.

In order to give Chen Hua a "popular science", Yuwen Wen prepared three identical telegram models, preventing that if one or two of them were broken, there was a third one that could be used.

He saw Chen Wu fiddling with these three models, and found it funny: "Why, what are some good ideas?"

"Uh... the switch is turned on and off, and the armature of the electromagnet is operated simultaneously, right?"

"Um."

"Then..." Chen Wu fiddled with the three models and hesitated a little: "Uh... Actually, there is no need for someone to deliver the telegram..."

"Yes, high voltage current is OK."

"No, no, I mean, today's telegram transfer stations do not seem to need to rely on people to receive telegrams and send telegrams to serve as relays."

Yuwen Wen almost blurted out, "How is this possible!", and when he saw Chen Hua seemingly confident, he disagreed:
Chapter completed!