Chapter 227 The Telegram in the Experimental Phase

Liu Hou had already relayed some knowledge of the telegram to Zuo Ci, and he had also described the situation of the receiver to him. Liu Hou's deepest impression of the telegraph was the tick-tock sound, and the reason why the telegram emitted this tick-tock sound was because the receiver converted the received electrical pulse signal into a sound signal of different lengths.

To convert electrical impulses into sound, you need a component that can produce sound, which is commonly known as a speaker or headphones. Speakers and earplugs that can produce high-quality sound are not a simple thing, of course Liu Hou can't do it, but it is still no problem for Liu Hou to get something that can sound.

When Liu Hou was in physics class in middle school, there were a few practical operation classes to learn to install speakers, and later he used countless headphones, and he removed them, and even repaired countless headphones, headphones, and the basic structure of the speaker he still knows, nothing more than a magnet, a coil and a vibrating film.

The magnet creates a magnetic field at the bottom of the unit, and the voice coil, the coil, is placed in this magnetic field. When the voice coil is energized, the electromagnetic field generated by the voice coil repels or attracts the magnetic field of the magnet, so that the voice coil moves in the magnetic field, and the top of the voice coil is the diaphragm, so that the movement of the voice coil causes the vibration of the diaphragm, and then because the diaphragm pushes the air, the sound is emitted.

Of course, this is the simplest principle of headphones, in fact, there are other principles used in advanced headphones, those things that are too professional Liu Hou doesn't understand very well, fortunately, there is no need to be so complicated now, all you want is to be able to make a sound, and you can even care what kind of sound it makes.

Liu Hou drew the structure of the headset and handed it over to Zuo Ci to organize people to develop, and after several twists and turns, he finally created a headphone that can produce sound, but when he received the electrical pulse from the far end, this headset emitted not the ticking sound that Liu Hou was familiar with, but the rustling sound like an AM radio when there was no signal.

But it doesn't matter, no matter what the sound is, as long as there is a sound, the telegram needs to transmit the length and shortness of the sound, as for what the tick sound, or the rustling sound does not affect the reception effect.

With headphones, a receiver that converts electrical impulses into sound, the simplest telegraph system can be considered to have taken shape, and this set of things has actually been made a few years ago. As for the device that can automatically convert the electrical impulse signal into long and short symbols drawn on the paper tape, it is much more complicated.

It is already an automatic receiving device, and Liu Hou has the impression that the automatic telegraph receiving device seems to have been invented by Edison, and it is unlikely that it will be developed with the current scientific and technological level of Shu. Liu Hou has already put forward the concept, and Zuo Ci has also organized some people to do research in this area, but this is not a project that can produce results in the short term.

Nowadays, the method of listening to the signal by ear, recording it by hand, and then looking up the dictionary and translating the signal into text is very primitive and error-prone, but it can still be used. When encountering important information, you can use the method of backshot verification to ensure the correctness of the received information.

For example, after receiving a message, the receiver sends the message back to the sender, and the sender compares the received message with its own text and confirms that it is correct, and then sends another confirmation signal. This method is cumbersome, but it ensures the accuracy of the information delivery.

So, since the telegraph device has been invented, why hasn't Liu Hou popularized its use? The simple reason is that the electrical impulse signal cannot be transmitted over long distances. In this era, there were no semiconductors, no electron tubes, no current amplification and rectifier components, and the amplification of electrical signals could not be realized.

It is well known that there is a loss of electric current propagation in a conductor, and the weak electrical impulse signal quickly decays to an unintelligible distance during propagation, which makes it impossible for this telegraph device to transmit long distances. At present, telegraphs can only be transmitted within one city, and it is not possible to transmit farther than even two adjacent cities.

In such a short distance, the sending parties have to translate the dictionary, and the time it takes is not much faster than riding a horse to transmit the message, so the telegraph technology mastered by Shu has no practical value.

If you insist on using it, it is not impossible, then you must set up a transfer station every few tens of miles, and someone must be stationed at the transfer station to send the received telegram to the next station.

This is no different from a hot air balloon relay signal, which is very expensive and very slow due to the constant re-shooting. Therefore, this epoch-making technology can only be stored in the Zài real yàn room, but Liu Hou has increased the investment in the Information Research Institute, plus some electrical knowledge that he secretly taught through Guò Zuo Ci, he believes that it is only a matter of time before this problem is solved, and it will not be too long.

Of course, he would not personally explain to Sima Yi what telegraph was when it came to so much professional knowledge, and it would not be self-inflicted to explain to him, a person who had no foundation in physics, what telegraph was? Therefore, Liu Hou still said the same sentence, and let him have time to go to the military researchers of the Information Research Institute to understand the situation.

Sima Yi couldn't help but be disappointed when he saw that the little emperor refused to explain in detail what the legendary artifact that could instantly transmit information to thousands of miles away, although he was very curious and wanted to figure out what it was immediately, but he didn't dare to be rude in front of the emperor, the emperor was always the main body, and in front of the emperor, he could only follow the emperor's wishes, and this understanding believed that every Confucian student had.

So, Sima Yi had no choice but to change the topic and casually chatted with Liu Hou about some other things, at this time, he suddenly heard Zhou Xue "Huh": "Huh? Who is that? ”

It turned out that after Zhou Xue finished eating, she leaned out of the window to watch the scenery outside the window, and at this time suddenly saw a group of ragged people coming to the opposite side of the "Zuixiang Building", either sitting or kneeling there to beg, and even two children kneeling there, with a straw mark on their backs that represented betrayal.

When Liu Hou and Sima Yi heard Zhou Xue's words, they also leaned to the window, looked out, and soon found the group of people. Liu Hou found that these people were men and women, old and young, but one common feature was that they were dressed in tatters, and the skin on their faces and hands was full of dirt.

"It should be homeless, and when the war is together, there will be more such homeless people, and many people will be forced to leave their homes in order to escape the scourge of war. I just don't know where they came from. Sima Yi said.

"It's easy to find out where they're from, just ask them to come up and ask." After Liu Hou finished speaking, he beckoned a personal soldier to come over, and instructed them to go and ask the store to send some food to these homeless people, and by the way, invite the leader upstairs to interrogate.

As soon as Sima Yi heard the emperor's words, he immediately objected: "Your Majesty, these people are vulgar and dirty, and they must be stinking, so I don't have to let them collide with the holy driver." ”