The village made a magnet telephone with a battery, and the electricity from the battery provided the sound carrying, and the hand-cranked one emitted alternating current, which was used to connect the person to the artificial switch.

The person who switches the manual exchange is equivalent to a microphone builder, one side shakes the phone, and when it sees the sign dropped, he answers the phone and asks where the other party wants? The other party said yes, and he connected the plug of the other phone to this one, and the phone rang over there, and the two sides talked.

Since there is no filter, it is impossible to make carrier devices, so only one telephone line can be connected to one telephone.

For example, if the manual exchange is X, the other phones in different locations are ABCDEFG, and each of the seven locations must be connected to X with a phone line.

If A and B are on the phone, and C wants to find A or B, it can't, unless C has more permissions, then C looks for X, and X helps the connected AB, turns around and disconnects AB from communication, connecting C to A or B.

Whoever has the greatest authority, depends on whose status is high, and at the same time depends on whose affairs are serious, Zhu Yuanzhang guarantees that it is the first priority, but if the barracks mutinies and there is a phone call, the barracks line will be given priority.

However, the magnet telephone has a shortcoming, the distance is long, and the electricity is not enough from one side of Xiaqiu Village to another.

Then the power supply can be provided at the place of the artificial exchange, and this power supply can provide signal carrying channels for multiple telephone lines.

In other words, the phone line is always charged, and it can be picked up at any time.

Zhu Wentian tried the magnet first, waiting for everyone to get used to how to call, and then the telephone line over there was erected, and then replaced with a common electricity one.

The village can still provide this electricity, but it looks like a spider web when the telephone line is erected.

"The phone is like this first, go back and get the telegraph, we have to go far away, we need to contact this side at any time, the wireless telegraph technology is not high, and there is no need for diodes."

Zhu Wentian was very satisfied with the phone, and the next step was to take out the telegram before leaving, the one that could not talk, and the one that needed higher technology to build a radio station.

The normal telegram uses Morse code, according to the rules, it is replaced by numbers, four numbers represent a Chinese character, and it is checked in the hand of the book, and it does not need to be encrypted.

When there is a telegram, what else will you light a beacon fire? When you see an enemy, send a telegram out, then run away in a hot air balloon and continue to send a message on the hot air balloon.

"Let the man-made parts in the village go! Some simple, enclosure or something, sent to the industrial area.

We don't need dry batteries in our village, just take lead-acid batteries, which have more electricity and can be charged, and the cost of dry batteries is high.

The chemical battery can only be dismantled once, and it is troublesome to choose a battery that can still be used. ”

The little girl thinks that it is better to plug a dry battery into the telephone than to connect a battery, and the voltage can be adjusted.

"Build a few for everyone to play with first, and then share electricity, and you need to connect two more transmission lines to avoid problems with one generator." Zhu Wentian thought about it, and the battery was not as good as the common electricity.

When I come back from this trip, I can rebuild diodes and other electronic parts, and with the carrier, I can add a few more telephones to one iron wire.

Of course, when laying wires to another Xiaqiu village, several iron wires were also erected together.

Tell the people, don't put down the telephone pole and steal the telephone line, it is useful, and the court is of great use.

And if you see someone who is sabotage, report it and give a reward.

……

Seeing noon, the people who soak in the hot springs go to wash with ordinary water, the hot springs are high in minerals, except for the bubble hot springs, other hot springs are not suitable for drinking water.

Zhu Yuanzhang was refreshed, changed into civilian clothes, and sat upstairs again, where someone was already buying rice noodles.

The ministers arrived first and greeted him, the queen, the crown prince and others.

He saw that there was an extra thing on the table, and looked at the long: "Yichang, for eating?" ”

"Your Majesty, the one used to deliver the news is to call the telephone, use electricity to speak, you can speak directly, and the other one is downstairs, you can send someone down to listen."

The lieutenant doesn't want to introduce more, just give it a try.

"Go to Hongu." Queen Ma is afraid that others will lie, so she wants to verify it herself.

Queen Ma went downstairs, Zhu Yuanzhang shook the telephone under the guidance of the lieutenant chief, and a voice came from inside: "This is the artificial exchange house, who is No. 1 looking for?" ”

"Is it Ling'er? Let's find Queen Ma, she is downstairs. Zhu Yuanzhang heard the movement and thought it was very interesting, but he didn't see the little girl.

"Wait a minute, I'll transfer it for you." The little girl over there said that she would insert Zero-2's into it, and the two sides would connect, and at the same time send a signal to Zero-2.

As soon as the phone in front of Queen Ma rang, she picked it up at the signal of others: "Can this speak?" ”

"Girl, it's us, are you really?" Zhu Yuanzhang heard it again.

"It's me, you're upstairs?"

"Yes, I'm upstairs, downstairs?"

"I just came down, what are you going to eat today?"

"Drink mutton soup! Or a small garlic tart in the morning. ”

"I'll go up now, let's pair up."

"Good!"

It didn't take long for Queen Ma to come up, and the two of them repeated it again in person.

"Oops! Biao'er, you go down, wait a minute, let's write something, you go down and read it to us. ”

Zhu Yuanzhang was surprised, and he didn't want to toss his sister all the time and let his son go downstairs.

Upstairs there are four treasures in the study, as well as a pencil, Zhu Yuanzhang simply wrote a sentence with a pencil, folded it after writing, and handed it to Zhu Biao.

Zhu Biao ran down, the phone was not broken, he picked it up: "Father, father, are you listening?" ”

"Listen! Read! ”

"Qingming does not replenish the yang, and Lang Zhong runs and breaks his intestines. Father! ”

"Done! Come on! Good stuff, who makes it? Calling the phone? In the future, if we want to eat, we will call the village, and the village will send it to you. ”

Zhu Yuanzhang's eyes lit up, and he thought of a use.

Ministers: "......"

When they were equally shocked, they couldn't agree for a while about ordering something that used this kind of immortal method.

Zhu Biao ran up and returned the note to his father: "Father, I can really hear it." ”

"Yichang, isn't this upstairs and downstairs?" Zhu Yuanzhang considered the distance, upstairs and downstairs, just shout.

"Your Majesty, it can be far or near, now this, thirty miles is no problem, and there will be farther in the future, and there will be soon."

The lieutenant nodded, it's not upstairs and downstairs, electric light and telephone, you have to call and talk downstairs!

"How? How do you talk when you're far away? "When Zhu Yuanzhang saw it for the first time, he had too many puzzles in his heart.

"Just like wires, where the wires are laid, this can be connected, and wires are needed.

The village plans to put up wires to the village over there, and then connect them to Ningguo Mansion and Taiping Mansion to facilitate talking to the government office.

The iron mine in Ma'anshan, with this, knows the situation at any time, industrial areas, factory areas, military camps, etc.

Here's how it works......"

The lieutenant recounted the knowledge he had learned to everyone, and he himself felt that it was good and convenient to use.

Zhu Yuanzhang nodded again and again, and when the chief finished speaking, he spoke: "Which person do we call to see us, just use this?" After eating, I hurried to set up a line for us, and the nearby state capital was all over the frame and crossed the Yangtze River...... Not yet. ”

(End of chapter)