"Oh dear lord, who domains the fate of this world".

This was the emotion expressed by the great comrade when he faced the complicated domestic situation at that time and wondered who would control the survival of the nation.

In nature, the most prominent sinking and floating phenomenon obviously occurs in water.

Whether an object sinks or floats in water depends on what?

This question of who is responsible for the ups and downs has been studied since ancient times, and many scholars are competing to answer it.

After mankind entered the civilized era, after a long period of exploration, the problem of sinking and sinking finally became clearer.

Two thousand years ago in China and Greece, scholars came up with the correct answer, which was the discovery of the principle of buoyancy.

Judging from the available materials, the credit for the earliest discovery of the principle of buoyancy in the world should be attributed to the famous Mo Zhai school of thought in my country's pre-Qin period - the Mohists.

Regarding the fundamentals of the principle of buoyancy, Mohists pointed out brilliantly that the weight of the entire floating body is balanced by the buoyancy force of water on the underwater part of the floating body.

When an object is placed in water, whether it sinks or floats depends on its specific gravity.

For an object with a specific gravity greater than water, its weight is greater than the same volume of water, and the buoyancy of water is less than its weight. If it is placed in water, it will sink to the bottom.

As for an object with a specific gravity less than water, its weight is less than the same volume of water, so it floats on the water surface and becomes a floating body. The buoyancy of the water on the part submerged in the water is enough to bear its weight.

For a floating body, specific gravity is the main factor that determines its degree of sinking and floating: under the same geometric shape, the floating body with greater specific gravity has a deeper draft.

Most people tend to think that a large floating body has a deep draft when placed in the water.

In fact, this is not necessarily the case. For a floating body with a certain specific gravity, it is generally not the larger the volume, the deeper the draft, but the greater the height, the deeper the draft.

By making a large floating body into a flat shape, its draft can still be small.

It can be seen that the draft is related to the thickness of the floating body, but has nothing to do with the total volume of the floating body.

Therefore, Mohists pointed out that the draft of a large floating body can be shallow, as long as the buoyancy of the water balances the weight of the floating body.

Although it is true that the greater the height (thickness) of the floating body, the deeper the draft.

But conversely, the deeper the floating body's draft, the greater its height, which is not necessarily correct.

Because the height of the floating body is not the only factor that affects the draft of the floating body.

The shallow draft of a floating body may not be due to its small height, but due to its small specific gravity.

Therefore, Mohists also pointed out: When the buoyancy force of water on a floating body is balanced with the weight of the floating body, its shallow draft does not necessarily mean that its height is small.

These Mohist discussions on the principle of buoyancy are recorded in the "Mo Jing", which was written from the 5th century BC to the 4th century BC.

These discussions are very characteristic. They focus on the close relationship between draft and shipbuilding.

You say the Mohists are awesome or not, but who would have thought that the ancestors of shipbuilding actually came from the Chinese Mohists.

The reason why we talk about the buoyancy problem discovered by so many Mohists is because it played a decisive role in the future construction of iron-armored battleships in the Ming Dynasty.

Zhu Cixiang has given the technical drawings of steam engine manufacturing to several scientists at the Royal Academy of Sciences.

Zhu Cixiang would give them samples in the future. At first, he thought they would not be needed for the time being, so he did not give the steam engine samples to the Royal Academy of Sciences.

If it is true that descendants of the Mohist family appear, the Ming Dynasty's future armored warships will surely set sail on the top of the world's oceans more than two hundred years in advance.

Zhu Cixiang originally wanted to pacify the Jiannu and rogue bandits first, and then carry out some reforms in the Ming Dynasty to develop the navy.

As a result, the descendants of the Moh family suddenly appeared, which may put the Ming Navy on the agenda in advance.

Too excited to sit still on the throne, he stood up and walked back and forth in the Chengyun Hall, thinking about the future development direction of the Ming Dynasty.

After about half a stick of incense, Gao Wencai and Shen Wanwan walked into the Chengyun Hall with a dozen of them.

Shen Wanwan said to one of the middle-aged men:

"Mo Xia, meet the Crown Prince quickly!"

The middle-aged man hurriedly came forward and prostrated:

"Greetings to the Crown Prince of the Ming Dynasty, Mo Xia, a wanderer of the Mohist family, has returned from overseas. If he never gives up, the Mohist family is willing to do its best for China."

After Mo Xia, a dozen other craftsmen also prostrated themselves:

"Seeing that the Crown Prince of the Ming Dynasty is a thousand years old, we are all Chinese wanderers wandering overseas. After hearing that the Crown Prince is recruiting talents, it is our greatest wish to return to our hometown and serve the country..."

Zhu Cihong reached out to help Mo Xia up, and then helped up a dozen other people one by one.

"Everyone, please recover quickly. I am very happy to get your help. I hope we can revitalize China together.

Especially the appearance of the descendants of the Mo family surprised me very much. Before I met you, I thought that there were no descendants of the Mo family alive!

Everyone, please take a seat! Tell me about the current overseas affairs, especially the large warships in the West..."

"Thank you, Your Highness the Crown Prince!"

Mo Xia and others thanked the crown prince and sat down at the bottom of the table in a polite manner. A palace maid immediately served them tea.

Mo Xia cupped his hands and said:

"Your Highness, more than a dozen of us have worked in the Netherlands and Franjiren shipyards. After going through many hardships before coming to the Ming Dynasty, we are very familiar with Western warships.

In the early Ming Dynasty, Fu Chuan was a flat-bottomed boat and was not suitable for ocean warfare. To be precise, it could not be used in large-scale naval battles.

The most advanced warship in the world at present is the Clark Galleon of the Daifo Langji.

But the Dutch have built Galenic ships, which seem to be better than Spanish galleons in naval battles..."

Mo Xia reported everything he learned about Western warships to Zhu Cihong.

As a time traveler, Zhu Cixiang also knows something about Western warships.

At this time, the Ming Dynasty was far behind several Western maritime powers in terms of warships and shipbuilding technology.

In the next few decades, there will be large battleships with hundreds of huge cannons on multiple decks, and line arrays will be used to bombard them wildly during naval battles.

Seeing the crown prince nodding frequently, Mo Xia continued:

"Your Highness, the Ming Dynasty is in very short supply of materials for building large warships. In the past, oak was mainly used for shipbuilding, but the wood that is truly suitable for warships is teak. We must find a way to get teak..."

Zhu Cixiang nodded, then took out the blueprint for the Galen ship and handed it to Mo Xia:

"Shipbuilding is not a problem. Materials can be purchased from several countries in Southeast Asia. Let's see if you can build this kind of warship?"

Mo Xia's eyes suddenly lit up as he took the drawing, his eyes full of heat:

"Galen Ship? His Highness actually has the construction drawings of the most advanced warship at present? This thing is all secret and can't be bought for ten thousand dollars. It's really great.

More than a dozen of us can independently direct shipbuilding. As long as we have the drawings and materials, we can build it.

But we still need to recruit a large number of carpenters. There are many skilled craftsmen in Ming Dynasty, so it will definitely be difficult for just a dozen of us."

Zhu Cixi nodded:

"This kind of ship is often built, and it requires three decks. About thirty cannons are placed in front of each deck. The craftsmanship, materials and money are not a problem!"

What Zhu Cixiang said is a first-class battleship in the true sense.

He first built a first-class battleship as soon as he started, otherwise there would be no point in falling behind as soon as he built it.

Mo Xia was shocked when he heard this, but quickly nodded:

"Don't worry, Your Highness, as long as you give us your full support, we can build this kind of warship!"

Even though Mo Xia has extensive knowledge, he cannot have the prophetic ability like a time traveler.

But with drawings, materials and money, Mo Xia has the ability and confidence to fulfill the crown prince's wish. I like the Ming Dynasty, and the prosperous age begins with the crown prince supervising the country. Please collect it: (https://www.myxls.net) The Ming Dynasty, the prosperous age begins with the prince supervising the country. Search and read
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