Yan Zheng didn't have time to wait for the wood to dry naturally, all he had to do was build a drying plant for the wood.

The principle is similar to that of smoked bacon, which can be dried with charcoal or smoked by fire. In addition, you can use the principle of burning kang to dry the wood.

The only drawback is that it is not as stiff as natural air drying, but it is better than two or three months, and it can achieve the effect of natural air drying for five years.

The specific operation is also very simple, that is, use red bricks or adobe bricks to build a triangular arch structure, as long as the wood is dried, it can be put in.

When drying, you can use the exhaust gas of the steel mill or ceramic factory, or directly on the outer layer, lay a layer of charcoal and ignite it.

If conditions permit in the future, a large wooden truss type factory can also be established, and a large amount of wood can be dried at one time by using the shelf structure.

It was only after building two small drying kilns that Yan Zheng found that in order to quickly process wood ribs, it was necessary to use a profiling machine.

Therefore, I simply experimented with direct drying of molded wood, and found that under the thermal expansion and contraction of wood, the size of molded wood is easy to change and crack during the drying process.

After thinking about it, Yan Zheng felt that when he built a ship in the future, he could directly use the iron rib structure, and the crucible could be brought to the beach at any time anyway.

…………

…………

The senior class was set up in a thatched hut not far from the Red Room.

At this time, there were only twenty-four students, half of whom were indigenous, and generally the children of Ming immigrants.

Yan Zheng now teaches these students every day, and each of these students can teach the lower classes.

As a result, a situation has been formed in which learning first leads to learning later, which has accelerated the speed of popularization of education a lot.

And because of the rules set by Yan Zheng, some cadres also need to rush back from time to time to study.

Wang Qimei, Ah Ku, Li Ya and others deliberately came back today to participate in the study.

What they learn is not what teaches you how to be a cadre, but physics!

Yan Zheng had already published a book of "Physics Knowledge", as a booklet with some popular science nature, which explained some physical phenomena and deduced formulas in the form of examples and circumstantial evidence.

"Hello students!"

Soon after the people came, Yan Zheng also came with a stack of lesson plans.

All the students quickly got up, bowed and shouted, "Hello teacher!"

Yan Zheng waved his hand to sit down for the student, came to the blackboard and said, "Today, let's continue to study physics and mechanics, last time we talked about gravity, that student can repeat it?"

More than half of the people immediately raised their hands.

Yan Zheng named an indigenous boy, and after the boy stood up, he said: "Gravitational force is the gravitational force that exists in any object, and the earth under our feet also has a mutual attraction to us, so we will fall down after jumping, instead of floating out directly!" Let's call the force of the earth on us gravity! ”

This answer is honestly very simple, but in terms of physics, it is also such a simple explanation, and there is no process of deriving the gravitational coefficient.

Instead, it directly tells students how the gravity formula comes from and what the gravity coefficient is equal to.

Therefore, this teaching is still of the nature of popular science, but students will be organized to repeat the experiment of gravity coefficient in the later stage.

For example, the gravity test, which has been done now, through two simple control groups, two iron balls were thrown from the same height, and then tied to feathers for them to drop, and it was concluded that objects of any size, after being affected by gravity, should fall at the same speed.

"That's a good answer, who else would like to add?" Yan Zheng smiled and said.

Raising their hands again, these students are already very accustomed to this kind of classroom environment.

Yan Zheng smiled and named a Ming girl, and after the girl stood up, she replied in a new accent: "Gravitation is related to the mass of objects, and it is also related to their distance, our earth and the moon are a pair of gravitational systems, so there will be tides on the earth, and the moon will not escape." In the same way, the gravitational pull of the sun causes the earth to revolve around the sun, and other stars also revolve around the sun! ”

"That's a good point!" Yan Zheng nodded with satisfaction and said: "It's just that there is one thing that hasn't been explained, that is, the gravitational coefficient is a constant value, so after the formula is derived, we can find that any object has gravitational force, even if it is 108,000 miles apart, it can also be said that it has gravitational force." This statement is naturally a bit similar to the Taoism in our Taoist theory. ”

"Because the gravitational coefficient can be said to be a fixed value, and any object must be constrained by this fixed value. In the physics world, there are many such values, which are equivalent to the Tao of Taoism, and our world is affected by laws and Tao everywhere! ”

Yan Zheng said lightly, the reason why he was involved with Taoism was purely to find an ancestor for these theories, otherwise, he wouldn't know how to lie in the future!

All the students cocked their ears to listen, Yan Zheng continued: "Therefore, the objective law is not transferred by the will of people, we cannot transform the law, we can only use the law, in your work in the future, you must remember this sentence, that is, seek truth from facts, respect the objective law, in order to better transform the world!"

After finishing speaking, Yan Zheng wrote the word buoyancy on the blackboard, and asked the students to turn to the section on buoyancy.

"Today we talk about buoyancy, as we all know, recently the teacher has been busy in shipbuilding, and the knowledge to be used in shipbuilding is mainly mechanics. Among them, buoyancy is the key to whether the ship can float. After learning this section, you will understand that whether you can float on the water or not has nothing to do with what material you are made of. As long as the buoyancy is enough, the iron boat can also float on the water! ”

As he spoke, Yan Zheng began to introduce the knowledge of density, volume, and displacement, and at the same time took a piece of paper as an example.

When the paper is spread flat on the water, not a single small stone can bear it, but when the paper is folded into a boat, the same small stone can be lifted.

A piece of iron prepared in advance will also be placed in Pingtan, and then a large concave will be pressed out from the middle.

As a result, the iron also floated on the water, and this example instantly gave the students a sense of what buoyancy is all about.

"As you can see, boats can float on water, regardless of material, buoyancy and gravity. So according to this theory, we can build big iron ships in the future! ”

Ah Ku and Wang Qimei were both curious to watch, in the complicated guild work, coming to class was already a rare leisure activity for them.

Yan Zheng continued to talk about buoyancy, explaining that in some cases, buoyancy is calculated in this way.

These theories are only scratching the surface, but they can already be applied in production practice.

Moreover, the advanced class is a group of seeds, just like the foreign students who followed one after another back then.

It is hard to imagine that we are learning the Western scientific system by relying on the previous batches of foreign students.

After they returned to China, they actively taught and passed on what they had learned to the students of the time, who in turn continued to teach this knowledge to other students.

Historically, this process has been very rapid, almost five years after the first batch of foreign talents returned, we already have a group of very good locally trained talents.

This is very similar to the Meiji Restoration Japan, where in order to learn Western science more quickly and conveniently, Japan made a very far-sighted decision, that is, to directly let students learn English, and students who learn English well are eligible for the next study.

Therefore, since the Meiji period, Japan has had the term "college preparatory class". Shinyuki Akiyama, known as the first staff officer of the Japanese Navy, was born in a pre-university class!

In just ten years, Japan has copied back a university system and a modern military system from the West.

Yan Zheng didn't dare to have too high expectations, he only hoped that these students could become seeds and spread their knowledge.

To this end, he even prepared an alternative system, that is, anyone who wants to be a local power official must be the principal of a local school!

This set is also based on pastoral learning, in order to ensure the quality of education, and schools in various regions can absorb local outstanding talents!

…………

…………