"Your Majesty, the main difficulties of the phone have been solved. If your Majesty wants, I can install the phone number for Your Majesty within three days!"

When Emperor Chongzhen heard Zhang Mingwei's words, he couldn't help but be overjoyed and said, "Then you need to say it, as soon as possible!"

In fact, Zhang Mingwei could have made the phone call a long time ago, but he was hesitant before, which phone call is better.

To put it bluntly, the telephone is actually an electromagnetic induction device. It is essentially no different from a motor or generator.

Telephones also use magnets to pass through the coil, generating large or small currents, and then use current to drive the sound-generating vibrator on the other side. The only difference is that the motor or generator uses hydraulic or steam to drive the output of large currents, while telephones use sound to output the tiny currents.

Among the three major components of the phone, electric rings are indispensable. Otherwise, how could you know that the call is coming?

And this is the simplest, basically a deformation of the telegram or remote battery switch that has been demonstrated before.

The principle is very simple. Make an electromagnetic to suck a reed. An iron piece is installed on the reed to hit the head. When the electromagnetic is activated, the reed is subjected to suction force and will produce sound when it rings on the bell or another iron piece.

However, this can only produce a sound and is easily ignored. You cannot send someone to guard the phone next to it, so you need to ring continuously.

Continuous ringing is also very simple, just use this reed as a current circuit breaker.

In other words, when the reed is not turned on normally, part of the contact wire is regarded as part of the circuit. After the switch is turned on, the reed is attracted by the electromagnet and rings the bell. Since it leaves its original position, the circuit is broken, so the power is cut off after knocking, the electromagnet is cut off, and the reed is reset due to its elasticity.

However, as soon as the reed is reset, the current is turned on, so the electromagnet becomes magnetic again, attracting the reed to ring the bell again, and then the power is off... This cycle is repeated until the gate is turned on and the main circuit is cut off.

In this way, the electric bell was made.

The other two components of the phone are the earpiece and the microphone. There is a difference here, which is also the reason why Zhang Mingwei hesitated.

In the original history, there are two ways, one is the Bell magnet phone. The advantage is that it does not require power supply, and the current is caused by the oscillation of the microphone speaking. There are also defects, that is, the current is completely generated by sound, so the intensity is quite small, the transmission distance is not far, and the sound is relatively vague.

In history, Edison improved this phone, which means inventing a toner phone.

This toner phone is no different from a magnet phone in terms of the structural principle of the handset. However, on the microphone, the microphone is no longer a film to vibrate the cavity, but instead put the toner in a shallow cavity, so that the surface of the toner is vibrated and compressed by a metal sheet. Because the toner is conductive but not magnetic, there will be no induced current when the metal sheet vibrates and compresses the toner.

It can be said that toner telephones are connected to the bottom of the toner cartridge on a metal sheet, and use the toner as a conductor, or as a wire. Therefore, the toner telephone must be powered on, installed with a battery or powered from a distance, but the power required is not too strong.

When talking loudly, the metal sheet vibrates vigorously to compress the toner cartridge, and the density of the toner is relatively high. At this time, the resistance of the toner cartridge decreases and the current passing through is stronger. When speaking softly or not speaking, the toner cartridge is compressed less or not compressed, the thickness is wider and the resistance is larger, and the passing current naturally becomes smaller.

The principle of the entire phone is basically like this, it is very simple to put it bluntly. As for some more exquisite parts, such as a very thin copper sheet, a wooden insulating box containing toner, a copper sheet on the bottom of the electrode, and a screw used to fix it, Zhang Mingwei has some skilled craftsmen in his hands, and it is fine to make it by hand.

Therefore, Zhang Mingwei replied to Emperor Chongzhen that he would be able to handle it soon.

At this time, just as Emperor Chongzhen was about to ask Zhang Mingwei for an exact date, suddenly, the eunuch of the Silijian Prison, Wang Erbiao, hurried to the place, holding a memorial in his hand, looked at Wang Chengen beside Emperor Chongzhen, and then reported to Emperor Chongzhen with a smile: "Long live the emperor, good news, the governor of Fujian has just rushed forward for 600 miles and sent a good news..."

The 800-mile expedition of Jianlu was all bad news, but it was different from the Ming Dynasty. The expedition of expedition may also be good news. The previous few victories were reported in a hurry.

At this time, Emperor Chongzhen was a little strange when he heard this. Because he knew that there was no war in the south, especially in Fujian, so what was the urgent victory?

Zhang Mingwei naturally knew the big things about the Ming Dynasty. Not to mention that he controlled the Jinyiwei, Emperor Chongzhen would definitely ask him for his opinion on the bigger things. Therefore, he was a little curious and didn't know what a good thing was, but Wang Erbiao came to report the news happily.

Wang Erbiao received an urgent report with both hands, but did not dare to directly submit it to Emperor Chongzhen. Wang Chengen also explained: "That Zheng Zhibao came back from America and brought back a lot of things!"

When Emperor Chongzhen heard this, he was stunned for a moment and did not react for a moment. But soon, he immediately came to his senses and was overjoyed. He quickly opened the urgent report and read it, and said, "Sun Qing kept urging him to ask when he could attack Annan. I didn't agree. Now it seems that there is a chance?"

Under the current situation, the court unanimously agreed that the biggest problem of attacking Annan and re-controlling Annan is not combat-abortioning, but non-combat reductions. The cold and cold diseases are in Annan, and it is said that they are very serious.

Emperor Chongzhen always remembered that Zhang Mingwei said that there is a tree in the Americas that can cure cold and cold diseases. For this reason, he did not hesitate to give a title and sent people from the Zheng family to the Americas to find such a tree.

Now that Zheng Zhibao is back, he is naturally very happy.

However, it was a bit regrettable that he opened the memorial, even though he browsed the paintings and the instructions, he was still confused. He couldn't tell the difference between so many things, what good things were there, which one was that one?

So he personally walked to Zhang Mingwei and handed the urgent report to Zhang Mingwei. At the same time, he smiled and said, "You have to see the teacher before you can find out!"

Of course, Zhang Mingwei was also curious, so he reached out to take it and then looked carefully.

For him, what he was most looking forward to was of course the Jinjina Tree. This was the purpose of sending Zheng Zhibao.

In addition, afterwards, he remembered that there was another very important tree. In a sense, it was more important than the Jinjinna tree. I forgot before and kept thinking, would Zheng Zhibao bring it back?

To be honest, he was a little worried, just because he was afraid that Zheng Zhibao was a naughty man, so he asked him to take the cinchona tree mainly, so he really only brought the cinchona tree and ran back.

Just now, when he heard Wang Erbiao say that Zheng Zhibao brought a lot of things from America, he became expectant.

After looking at this, I turned a little bit, maybe because the Jinjina Tree was the main task assigned to Zheng Zhibao, so I put it on the first page and opened it. Zhang Mingwei actually had no surprises about this.

However, Emperor Chongzhen was very excited, so he said to Emperor Chongzhen first: "The tree that treats cold and cold diseases has been brought back!"

"Okay, okay!" After Zhang Mingwei's confirmation, Emperor Chongzhen was very excited and praised, "This Zheng Zhibao is indeed capable of doing things, and he will live up to my expectations..."

Zhang Mingwei ignored how happy he was. He immediately turned down and wanted to know if there was the kind of tree he was looking forward to?

As a result, after just one page was left, he saw the title read: A tree that could cry.

Just after seeing these words, Zhang Mingwei became excited and hurriedly went to see the pictures and then the description.

Then, he suddenly praised loudly: "Okay, okay, haha, it's so great..."

His sudden voice suddenly scared Emperor Chongzhen. However, when he realized that he was so happy when he saw that Zhang Mingwei was so happy, he immediately understood that there might be something very good in it.

Otherwise, with the eyes of Mr., it would never be so happy!

After thinking about this, Emperor Chongzhen could not bear it, so he immediately asked Zhang Mingwei: "Sir, have you discovered something good?"

For some reason, his expectant expression reminded Zhang Mingwei of his expression when he was about to draw the lottery.

Turning to look at the others, staring at him with great attention, Zhang Mingwei nodded to Emperor Chongzhen with a smile, and then said in a very affirmative tone: "I have indeed discovered something very good, and it is of great value. I think it is not an exaggeration to sign Zheng Zhibao a marquis!"

"..." Everyone, including Emperor Chongzhen, was stunned. It was not an exaggeration to designate Zheng Zhibao as a marquis. So how valuable is this?

When Emperor Chongzhen came to his senses, he didn't know anything about it, so he grabbed Zhang Mingwei's sleeve and asked quickly: "Sir, what kind of good baby is it? Tell me quickly!"

After hearing this, Zhang Mingwei immediately pointed to the tree drawn on the second page with his hand, and then said to Emperor Chongzhen: "Your Majesty, it's this tree that can shed tears."

As he said that, he began to introduce: "This milky white juice is called latex. The latex can be obtained after a few simple steps of condensing, washing, forming and drying. Natural rubber has strong elasticity and good insulation, plasticity, water barrier, gas barrier, tensile and wear resistance, so it is of great use and can be said to be unmeasurable!"

Emperor Chongzhen was confused. What and what? Why didn’t he understand!
Chapter completed!