The telegraph was invented at the beginning of the 19th century, but it was wired at that time, and it was not until the beginning of the 20th century that wireless telegraphy was invented, and by this time the telephone had already appeared. However, the cost of the telegraph was lower, and before the spread of fax and long-distance telephones, teletypewriters, which were invented specifically for telegraphs, were once used exclusively for long-distance communication in offices throughout the developed world.

For a long time after the founding of the People's Republic of China, the telegraph was still the first choice for long-distance communication, and money was charged according to the number of words.

At its core, the telegraph was the Morse cipher, which used ticks as the base unit and then used up to 5 units to represent a number or letter, ultimately transmitting information in this way. Chinese, on the other hand, uses 4 digits to represent a Chinese character, which is encoded and transmitted.

When I was in school at Jiayi, I needed to fill in my name when filling out the answer sheet and volunteer form, but I needed to use a numeric code instead of Chinese characters, because the automatic card reader could not recognize Chinese, only numbers, so each name corresponded to a 4-digit code.

At that time, a pamphlet was also distributed for people to check what the code of their name was.

Jiayi once thought that this was the Morse code, and also specifically went to understand the Morse code, and later learned that this is a Chinese character code, not Chinese code, the area code is a set of Chinese character codes specially designed for computers, although the same Chinese code is a 4-digit number, but it is not consistent.

The Morse code is earlier, and the location code is determined after the computer comes out. It is difficult to say that there is no inheritance relationship between the two.

Jia Yi now remembers the code of his name - 1941 5027 (Cheng Yi).

So now if you want to restore a set of Morse ciphers, it is not troublesome for Jiayi, and now the common language is the alphabet language, which is even simpler for coding, you only need to encode the basic letters, and you don't need to encode all the Chinese characters like Chinese characters.

Soon, Jia Yi compiled the Morse code he needed, and it was not difficult to use the connection between the copper crystals to make two communication circles that he could figure out, he had used the resonance characteristics of the copper crystals when he designed the ground fixing pillar, and it was not troublesome to use it now.

The designed communication tool is a small disc, about the size of a dinner plate, covered with patterns, and in the center is a (half) piece (half) of dark red copper crystal.

It's just a prototype, so it looks a little rough, and the pattern on the outside is an exposed rune circle, although it looks like a magical feeling, but in Jiayi's eyes, it's a bit like an engineering sample with the circuit board exposed.

With this communication disc in hand, Kaichi handed one end to Flor, and the other end to himself, and rushed all the way to Wickham City.

Found a place to live in the city, Jiayi took out the disc, connected the spiritual power into the disc, and used the spiritual power to trigger the controller of the copper crystal, controlling the copper crystal to vibrate, on the other side, the other copper crystal immediately felt the vibration, began to send signals, and the disc lit up.

Jiayi: "Hey, hey, can you receive it__"

............

Flor: "I received it, I really received it, I didn't think you would be able to do it."

............

Jiayi: "Why are you speechless, the language should be concise, don't repeat it several times, and you still have to use __ending__"

Flower: "This thing is so fast, how did you do it, it can't transmit sound, but it can transmit text__"

......

......

The two chatted for a long time with the copper crystal "telegram", Jiayi's copper crystal telegram is not fundamentally different from the telegram in the spy war drama, but he does not need to use manual triggering when he sends the telegram, but directly uses mental power to control the vibration of the copper crystal, and the length of the vibration is used to represent the two kinds of messages, and the other side receives it and then manually parses it.

Flower was not familiar with the back of the code, and every time he received a message, he had to translate the letter of the codemeter letter by letter, but this was much more convenient than the traditional way of communication. It's just that this method has a disadvantage, that is, it can only be point-to-point, and the same pair of telegraph devices can only communicate with each other, and cannot access a third party.

Jia Yi wandered around the street twice, the street is very busy now, although it is not a waste after the heavy snow, but there are losses in various places, and all kinds of material exchanges are more frequent.

As soon as he returned to the hotel where he was staying, he heard the guy in the store say that someone had come to visit.

After asking the guy to pick someone in, Kaichi stood up and said, "Rowell, is there anything you have to do here?"

Jia Yi is a little strange, how did Rowell know that he was here, Rowell's knights were not stationed in the city, but in the military camp outside the city, but as the high-ranking of the knights, they had their own residence in the city.

Rowell walked in and said, "I heard from Flor that you have invented a new method of communication that is very convenient, and I will come over to see if we can use it." ”

Kaichi beckoned Rowell to sit down, "How do you know? I haven't been on the phone with Flower for long?"

This communication efficiency is too fast, is it possible that the other party also has a set of instant communication system? Even if the speed is fast, the efficiency is not so high.

Rowell made an apologetic expression and said with a little apology: "This is the person that Flower sent to inform me yesterday, and I will come back from the barracks this morning, which is a bit presumptuous, but I am really curious about your means of communication. You know, it's very important for the military to be able to communicate quickly, so I can't wait. ”

Jia Yi didn't know what to say, and Flower and Rowell were a little too confident in themselves, and this thing hadn't been tested from a distance yesterday, so they were so sure they could succeed?

Rowell was a little anxious, and Jia Yi took out the communication array disk, demonstrated it to the other party, and communicated with Flower again.

After it was over, Jia Yi said: "You see, this communication circle is very simple, slightly modified, even if ordinary people use it, there is no problem, but not now, this thing is still driven by spiritual power." ”

Mages are different from knights, although mages can only release their mental power when they reach the level of a white-robed mage, but the mental power required to control magic props can be directly at the official mage level, or even at the apprentice level, and they can use magic power to trigger and control some magic props that are not of a very high level. But knights must be at least at the level of a great knight to use their spiritual power, at this time, the qi in their bodies can already be controlled freely, and the spiritual power can be mixed with the qi for manipulation, but the manipulation is not as flexible as that of a formal mage.

Generally, at the level of a great knight, there are not too many restrictions on the use of magic scrolls, but the flexibility is slightly weaker.

Rowell forcibly suppressed the fluctuations in his heart and asked, "And how far is this maximum transmission distance?"

Jia Yi blinked, and said a little embarrassed: "I don't know about this, I'm going to modify it again and send it to Memphelbo to see if Memphel Bo can receive the message." ”

"Meng... "Rowell was a little surprised, he was surprised to be able to communicate directly with Wickham City from Sainz Town, but he didn't expect Jiayi to want to communicate directly with Memphelbo, which was a thousand miles away. Even at the current distance, he felt very satisfied.

"Theoretically, the induction between copper crystals is not limited by distance, even in another continent, the communication will not be interrupted, but if the distance is farther, the more interference will be received, and the higher the accuracy required for analysis. ”

Rowell Zhengse requested: "Jiayi, you must give me a copy of this, no matter how much it is, it is too important for the command of the army." ”

The larger the army, the higher the command requirements, and if the army is outside, the more complicated the situation will be, although there will be fewer constraints from the rear, but there will be less intelligence, support, and so on.

It's no wonder that Rowell is so excited, although the Knights rarely dispatch, but once they are dispatched, it is the most urgent situation, and the Knights have higher requirements for backup materials, if they can keep in touch with the rear at any time, it is very helpful to ensure the combat effectiveness of the Knights.

Rowell looked at Jiayi, recalling that when he first met the other party, the other party was still a little radish head, but he didn't expect that in just a few years, the other party was already so good.

It's so good that it feels a little unreal.