The dam construction process is generally divided into three steps:

1. Interception: dig a strip or several tunnels or open channels on the natural river channel, and then intercept the flow on the river channel so that the water flows downstream along the diversion hole or diversion open channel;

2. Excavation of foundation pits: The dam can only be built on a stable geological structure, so the sediment on the river channel must be excavated, and the abutment (like a door frame) should be dug on both sides until the bedrock layer is exposed;

3. Filling the dam body: filling the dam body according to the type of dam (concrete dam, rockfill dam, etc.) until it is capped;

The current Bahe dam is in the second step, under Li Zexuan's order, a cement pillar wrapped with steel bars was driven into the foundation pit dug in advance, and the riverbed of the Bahe River was suddenly full of "bells and bells" hammering sounds!

After driving the reinforced concrete column into the riverbed, the next step is to pour the dam body below with cement, in comparison, this is not difficult, so Li Zexuan watched here for two quarters of an hour, then said to Mohuai and a few people, and left!

When passing by the workshop, Li Zexuan's heart moved, and he didn't go home directly, but walked towards the workshop with his feet up.

Coming to the workshop and asking where Mo Lingwei was, Li Zexuan came to a "laboratory" outside the workshop headquarters building, the door was not closed, it was so open, Li Zexuan pushed the door and entered.

I saw Mo Lingwei on the table, tinkering with a strange-looking machine. The upper end of the machine is a cylinder, there are many rotating mechanisms in the middle, and the rotating mechanism is also a cylinder, with four square tables under the cylinder, and there is a square hole in the middle of the table, and a spring clamp is fixed on both sides of the hole.

In terms of appearance, this is basically a "beggar's version" of a modern microscope! I just don't know how the image quality is!

I didn't expect this girl to be so hands-on and efficient! You know, in this microscope, all the fine-tuning parts are fine-tuned with screws, and the workshop does not have machine tools now, and does not have the conditions for batch processing of threads, and the screws used here are all processed by hand.

Therefore, this microscope is absolutely unique, even if Mo Lingwei is asked to make another one, she can't make it exactly the same.

This also shows that although one microscope has been built at present, it cannot be mass-produced.

Looking at the prototype microscope on the table, Li Zexuan couldn't help but say loudly: "Miss Mo has made a microscope?" ”

"Ah~~!"

Mo Lingwei was concentrating on debugging the microscope when she suddenly heard a voice behind her, and suddenly screamed, almost half frightened to death!

"Ahh Mountain Chief...... You...... You...... Why don't you make a sound when you walk? Also, why don't you knock on the door? Scared the hell out of me! ”

Mo Lingwei turned around and saw that the person who made the voice was Li Zexuan, she rolled her eyes and said angrily.

Li Zexuan said with an innocent face: "Miss Mo, this door is not closed, which door should I knock on?" Also, who said that I didn't make a sound when I walked, and I didn't deliberately control my feet, it was Miss Mo that you were too focused, so you didn't hear it! ”

Mo Lingwei snorted proudly, then bypassed the topic and replied: "This microscope has basically been assembled according to your intentions, and it is indeed possible to see some small things clearly, but there are still two problems, I can't figure it out!" ”

Li Zexuan was curious: "What's the problem?" ”

It stands to reason that Mo Lingwei's practical ability in engineering is unmatched in the entire Yanhuang Academy, so Li Zexuan is also very curious about the problems she encountered!

"First of all, the problem of the light source, because the distance between the objective lens of the microscope and the object to be observed is very small, it is difficult for the light to shine on the object to be observed, so the image seen through the eyepiece will be very dark and difficult to distinguish;

Second, what's the point of making microscopes with all this effort? Is it just to see the little things? But if you want to see those tiny things with a magnifying glass, why bother? ”

Mo Lingwei frowned, very puzzled.

I have to say that this girl's attainments in optics can definitely be regarded as entering the room, and now communicating with Li Zexuan, some of the "professional terms" that she inadvertently said, it is estimated that she can't understand it when you change it, and she is strong!

Li Zexuan smiled and replied, "Miss Mo, the first problem you found is not without a solution!" First, you can use a set of fairy mirrors to reflect the sunlight outside the house or the candle light inside the house to the object; Second, we can create a light source directly under the stage that carries the object being observed! ”

"Make a light source? How do you make a light source? Could it be that you want to put a candle underneath the mountain? That's not going to work, the candle will blacken the lenses! ”

Mo Lingwei hurriedly said.

Li Zexuan said with some amusement: "Who said that I want to use candles as a light source?" You can rest assured, the light source I am talking about will never produce any smoke and dust when it emits light, and the light it emits is several times brighter than the light of a candle! ”

Mo Ling Weiqi said: "No smoke and dust? Don't you need to burn this light source when you shine? But how can there be anything in this world that can shine without burning? Chief, take out this light source and let me see it! ”

At this moment, Mo Lingwei's interest in the light source mentioned by Li Zexuan is far greater than the microscope itself.

Li Zexuan touched his nose, coughed dryly, and said, "Ahem!" Ink girl, this light source hasn't been made yet, so you should use the first method I said now! ”

The light source he is talking about is actually the light bulb, although he can't get the key material of the bulb - tungsten filament, but it can be replaced by other materials, such as carbonized bamboo wire!

In 1854, Henri Goebbels used a charred bamboo wire and placed it under a vacuum glass bottle to emit electricity. His invention today appears to be the first incandescent lamp with practical utility. At that time, the light bulb he experimented with could last 400 hours, and Edison's incandescent lamp made of tungsten filament only cared about 1,000 hours.

So before finding tungsten metal, it is a very good choice to use carbonized bamboo wire instead of tungsten wire!

Mo Lingwei listened to Li Zexuan "blow" this light source for so long, but in the end, she said "I haven't made it yet", Rao is usually she respects Li Zexuan very much, and she can't help but roll her eyes at Li Zexuan at this moment, if it were someone else, she would have sprayed directly: If you don't make it, you tell the old lady a fart!

“…… What about the second question, Chief? ”

Mo Lingwei took a deep breath and resisted the urge to scold, and said.

Li Zexuan smiled a little embarrassedly and said, "As for the second question, in fact, I asked Miss Mo to make a microscope in order to observe more tiny objects, and it is difficult to see clearly with a magnifying glass!" ”

Mo Lingwei wondered, "A smaller object? What is that? Is it still a molecule or an atom? ”

Now in the "Physics" or "Chemistry" textbooks of Yanhuang Academy, there are only introductions about molecules and atoms, so it is not surprising that Mo Lingwei can know molecules and atoms!

It's just that...... This girl really dares to say that she wants to use a microscope to see atoms, which is too demanding!

First of all, it is necessary to make clear that the size of the atom is about 0.1 nanometers (nm), while the general optical microscope, because the wavelength of the visible light source is distributed in 400 -700 nanometers, is limited by the diffraction limit, and the resolution limit of the optical microscope can only be a few hundred nanometers. Therefore, if you want to see atoms with a microscope, you must use a super-resolution electron microscope.

Judging from Datang's current industrial base, let alone more than ten years, even if Datang is given a hundred years, it is estimated that the technology will not develop to that extent!

Miss Mo laughed, I was talking about smaller objects, but not atoms. Oh, by the way, have you ever calculated what the magnification of this microscope is? ”

Li Zexuan suddenly thought of a very critical question, so he asked.

Mo Lingwei thought for a moment and replied, "I have roughly calculated that the magnification of this microscope is about four hundred times!" ”

Hearing this, Li Zexuan nodded with great satisfaction. The world's first ultra-large magnification microscope made by Hook has a magnification of 270 times. Two hundred and seventy times that of Hook!

"Haha! Very good! Four hundred times, it should barely work! ”

Li Zexuan laughed, and then pretended to be mysterious: "Miss Mo, you first follow the method I said before, and then improve the microscope, and then I will show you a good thing!" ”

Mo Lingwei was very curious and said, "Mountain Chief, what is a good thing?" ”

"Hey, hey! This is kept secret for now! ”

Li Zexuan smiled and did not answer.

Mo Lingwei pursed her lips very dissatisfied, then changed her pitiful face, and said: "Mountain Chief, you see that I am a girl's family, I don't learn poetry and etiquette, but I work for you in the workshop every day, and I don't charge you for your wages, am I easy?" You still treat me like this, you don't know how to pity the fragrance and cherish the jade! Hum! ”

Li Zexuan was excited, and secretly said that this girl is really a brutal actor, and it is estimated that only Yan Shaoning can surrender, so he hurriedly waved his hand and said, "Ahem!" Miss Mo, as for what I'm going to show you in a few days, it's useless to say it now, because I haven't made that thing yet! But you really contributed to the fact that this microscope can be made, but I am not a stingy person, and you will definitely be satisfied with the benefits that will be given to you when the time comes! ”

Mo Lingwei's eyes lit up, and she suddenly came to her senses, and she hurriedly asked, "What benefits?" Tell me about it, mountain chief? ”

Li Zexuan smiled and said, "This benefit is to help you talk to Yan Shaoning!" What do you think? What are the benefits? ”

"Yikes!"

Mo Lingwei made a rare big red face, and she said angrily: "Who...... Who is going to marry him...... Chief, when will you help us with matchmaking? ”

"Huh?"

Li Zexuan looked dazed, and almost didn't turn the corner, "Ahem!" As soon as possible! I'll mention this to your father and Uncle Yan as soon as possible!" That one... You're busy first, I'm still on business, so I'll go first! ”

Li Zexuan hurriedly slipped away, he was afraid that if he stayed with this girl for a while, he would be made abnormal!

………………………

。 m.