open sea

Chapter 1092 The Treasure House
The reason why Zhu Zaiyu was in the circle was that he didn't know how to describe the feeling Chen Mu gave him, as if he was... I don't know.

But Chen Mu knew that he really regarded Zhu Zaiyu as an artificial intelligence computer with input buttons and an output display screen, as the most advanced computer, as long as he input a question, the answer would be displayed on the display screen.

Zhu Zaiyu did the same, because he thought it was interesting for Chen Mu to raise these questions.

So interesting.

This is a person who tirelessly explores the truth. Chen Mu's question is difficult, but it is not too difficult for him.

"Commander, everyone knows that the world is round, and all things in the world are attracted to the ground by geomagnetism. The two sides must be different heights. This can be calculated, but rough calculations are not accurate."

Prince Zheng moved as soon as he said it, picked up the pen and drew an arc on the paper, dotted ink on both sides to form a sea, but explained it to Chen Mu and Chen Gongshi, and then said: "It's better to use a more accurate method, using the Song Dynasty Layered weirs are used to measure the water level difference."

As he said that, Zhu Zaiyu drew several hills with different heights in one stroke on the map, added different water levels, and then drew several dams, saying: "Divide the canal into sections and build step-shaped dikes in layers to divert water. It is poured into it, and then the water level of each section is measured step by step, and the difference of each section is accumulated, and the sum is the actual level of the terrain and water level from Changsheng Port to Daxi Port."

Zhu Zaiyu said: "Except for both ends, it is lake water and river water, and the water drawn out can irrigate the surrounding farmland - how long is the canal in total?"

"I can't remember clearly, the military government has this report." Chen Mu thought for a while and said, "It's more than a hundred miles, passing many lakes."

"That's easy to say. It's not long before the Bianhe River. In the Song Dynasty, the water level difference in the 840-mile section of the Bianhe River was calculated in this way. The difference between the height and the height is [-] feet, [-] feet, [-] inches, and [-] minutes. It is accurate to the point. Isn't it enough?"

Chen Mu blinked, looked at the very intuitive and easy-to-understand sketch on the picture, and questioned himself directly: Is it that simple?
"Then, then there is another problem." Chen Mu stuttered a little, and asked with his hand gestures on the map: "The sea level is different, how should the canal be built? It will also cause the seawater to inundate the fields on both sides of the bank, although the imperial court does not have many fields on both sides of Panama... The main reason is that it takes too much time, because it is located in the tropics, and the mosquito miasma is not good for construction.”

When Chen Mu said this, Zhu Zaiyu frowned more and more tightly, his eyes were extremely probing, and he didn't ask until Chen Mu finished speaking: "Dug the ground? Why do you need to dig the ground?"

"How do you connect the water without digging, and how do the boats pass?"

"Does the commander know that there is a kind of water conservancy called double gates in this world? Double gates existed in the Tang Dynasty. The Song Dynasty had the most canals, and the water levels of the canals in the Central Plains were also high and low. Build Erdoumen."

"The two gates are more than fifty steps away. When the boat enters, a hanging door is set to store water. It will be released when it is level. The boat will go with the water and pass without hindrance." Zhu Zaiyu waved his hand and said: "It is used in parallel with the weir, and the gate is used for more water. If there is less water, weirs can be used, and triple gates can be built if there is a tide, and if the water source of the double gate is insufficient, one or two water storage bays can be built next to it.”

"As for how many complex gates are actually to be built and where to build them, we need to actually see them before deciding... Why don't we take this opportunity to teach water conservancy courses at the Imperial Clan University."

Hearing Zhu Zaiyu's words made Chen Mu laugh. He finally found out that this Prince Zheng's son is very smart. Needless to say, he is diligent in reading and studying, but he is just lazy.

He wanted to study astronomy and calendar, and then asked the imperial clan university to offer astronomy courses, and he took his brothers, nephews, and even relatives of grandchildren to study astronomy with him so that he could direct them to work; now Chen Mu wants him to offer suggestions for water conservancy repairs, He was also afraid of trouble, so he simply planned to let the clan university teach water conservancy courses, so that he could continue to use these brothers and nephews in the future.

But what can he say?As long as his problem can be solved, even if Zhu Zaiyu starts a pig breeding department at the Imperial Clan University, it will be fine.

He looked around Zhu Zaiyu's outdoor laboratory, felt where to look, clapped his hands and said, "Okay, that's it, it's a good thing that the Zongshi University will start water conservancy again!"

As he said that, just as his hand was about to touch a small piece of copper placed together with the copper pipe on the cabinet shelf, Zhu Zaiyu hurriedly stopped him: "Wait a minute, Commander, this square inch contains mercury, which is poisonous."

Chen Mu was so frightened that he quickly retracted his hand, and asked with a frown, "The poisonous prince still let this go?"

"Well, it's still the same thing as I just said. I don't have any utensils, so I can only measure and make it myself. This copper pipe is made by me. It is a standard ruler. A hundred millets are arranged in a row to make a foot; the copper block is also made by me. , the content of ten millet rice is arranged in columns and rows, and it is a square inch."

Chen Mu asked: "What is the use of this square inch and the copper pipe?"

"To play a musical instrument, the air enters and exits the pipe through the mouth, and then exits through the hole. People who are familiar with music theory can hear how far the breath has been blown by just listening to it. , the sound will not be accurate."

"If you want to make the pitch accurate, you need to make the tube accurate. However, the inner diameter of the tube is different from top to bottom. In the past, the air in the tube was measured by millet, but the millet has gaps. Therefore, when using mercury, first cubic inches are measured, and then the mercury is loaded in square inches. Weigh it, and it can be known that an inch of mercury weighs 13 taels, nine cents and two cents."

"In this way, you only need to count how many inches of mercury are poured into the copper tube, and then add arithmetic to know the geometry of its content."

Chen Mu blinked, Zhu Zaiyu had measured the density of mercury... So, this prince of the Ming Dynasty was forced to become a scientist by this era in order to play music better?

"Snapped!"

Chen Mu clapped his hands together, and said: "This method of Shizi can be used to measure the barrel of the gun! No need for mercury, just water. As long as the internal volume of the standard gun barrel is measured, all gun barrels can be measured by this method. If there is more water and less water, the inner wall of the gun tube will be uneven."

Zhu Zaiyu's discovery made Chen Mu start his imagination: "Since there are temperament masters like Shizi who can distinguish the length of gas by listening to the sound, and can also calculate it by arithmetic, then we can use the sound to measure the expansion of the gas ignited by gunpowder, so as to calculate the length of gas." The explosive force of different formulations of gunpowder can more accurately calculate the relationship between gunpowder, lead shot, caliber, length and power.”

At the end, Chen Mu raised his hand to cover his mouth, and watched Zhu Zaiyu finally clenched his hands into fists with joy: This son of King Zheng is really a treasure house.

If the normal development is that people try their luck to walk through the maze, even if they get to the door, they will finally have to use all their strength to push open the door of science and reveal a gap.

Then Chen Mu felt that as long as he and Zhu Zaiyu stood together, the maze would have been installed with navigation, and he was carrying a cannon. The Lord needed to go to the door and ask Zhu Zaiyu to light a fire, and the cannonball would blow the door open. Crush it to pieces, and then Zhu Zaiyu kicks it away.

"Ah!"

Chen Mu couldn't stop laughing, so that Zhu Zaiyu and Chen Shigong looked at each other, not understanding why Chen Mu was so happy, but they saw Chen Mu open his hands to them after laughing enough: "Come on, let's come now!" Let’s talk about how to make a microscope!”

Zhu Zaiyu's expression was troubled, he shook his head and said, "I really don't understand this."

Chen Mu was even happier, but there are things you don't understand, he just wanted to say, 'It's okay if you don't understand, I understand. ’ I heard what Zhu Zaiyu said later.

"Shen Kuo in "Mengxi Bi Tan" said that the ancients made bronze mirrors. If the mirror is large, the mirror surface will be flat; if the mirror is small, the mirror surface will be convex. It is impossible to take a full picture of a person's face, so making the mirror surface slightly convex can reduce the size of a person's face to a full picture, so even if the mirror is small, it can still show a full picture of a person's face."

"Since the commander-in-chief wants a pair of mirrors that can observe fine details, he needs to repeatedly measure, test the size of the lens, adjust the concave and convex of the lens, stack another lens if one lens is not enough, and repeatedly measure the middle distance... You see it this way What am I doing? I, am I right?"

　The double gate is a water conservancy project on the canal in the Northern Song Dynasty. It is similar to the modern two ship locks, but because the ancient ships were small, they did not open left and right, but hung up and down.

　　
　
(End of this chapter)