Since it was someone sent by Bai Qichang, Wang Lucao and the other three naturally wanted to meet in person, Ran Ming was smart and clever, and the son Yunyun, who had said a lot, welcomed Yunyun, so that the three of them settled down, and finally stopped thinking about the previous estrangement. rewarded Ran Ming with a big red envelope, and let him rest in the backyard first.

Ran Ming got the big red envelope, he was naturally happy, and he didn't need to do any work, this trip to Suzhou Mansion, he was happy and relaxed.

In the blink of an eye, in February, the price of rice in Suzhou Mansion has risen to a bucket of three dollars of silver, the people are miserable, is more excited, at this time, the swaggering Sun Hong also did not dare to go out more, when he had to go out, it was a small sedan chair, very low-key.

And the gyroscope drawings entrusted to Mr. Fu at the beginning have also come to witness the real thing.

On this day, it was the first time that Shen Kang went out in a month, Wei Wusu drove the carriage, accompanied by Liu Shu and Huang Sanyuan in the car, and the group entered the city lightly.

went around and around, and when I arrived in the alley, I found Old Man Fu's house.

After waiting in the main hall for a while, the old man Fu was helped out by his third son, holding a tray in his hand, the tray was covered with a red cloth, and the old man was red and greeted with a smile.

Old Man Fu said: "It can be regarded as looking forward to the son, and the old man has made three pieces, just waiting for the son to check which one is in line with his heart." ”

Shen Kang couldn't wait for a long time, so he hurriedly stepped forward and arched his hand: "The old man has worked hard. ”

Old Man Fu put the tray on the table, pushed his hand and said, "Childe, please take a look." ”

Shen Kang smiled again and raised his hand to tear off the red cloth.

The moment this red cloth was torn open, the navigation career of the Ming Dynasty was destined to reach a higher level.

This is a piece of more stable existence than the previous dynasties and dynasties that pointed out the direction of the artifact, it is accurate, not easy to damage, long service life, since then, the ships of the Ming Dynasty, the navy of the Ming Dynasty, can gallop on the sea, no longer afraid of losing their way.

The three pieces of gyroscopes have been carefully polished by the two fathers and sons, and the basic structure is the same, but the difference is the color or polishing degree of the appearance.

Old Man Fu pointed to the axis on the gyroscope and said, "Its outer ring shaft is straight, the rotor shaft is horizontally placed in the meridian plane, and the positive end always points north." Its center of gravity is downward along the plumb shaft, or upwards away from the center of support. When the rotor shaft deviates from the meridian plane, it also deviates from the horizontal plane, resulting in a gravitational moment that causes the gyroscopic to enter the meridian plane. ”

Shen Kang smiled and said, "This kind of gyrocompass that uses gravitational moments is called a pendulum compass. ”

Old Man Fu said with a smile: "Actually, this thing is also very simple, but it used to be used on sachets, but now it has been transformed into such a shape by Gongzi, but the use is very different." ”

Shen Kang's eyes lit up and said: "When the gyro rotor rotates at high speed, when there is no external moment acting on the gyroscope, the rotation axis of the gyroscope in the inertial space remains stable and unchanged, that is, it points to a fixed direction; At the same time, it resists any force that changes the axial direction of the rotor, which is the axial nature of the gyroscope. ”

He said this, and then sighed: "It has been buried for too long, and from now on, the sea is where it shines, Old Man Fu, you will go down in history." ”

Old Man Fu was infected by Shen Kang's scorching heat, but he waved his hand and said: "The old man is just doing it, and the son can see such a shocking secret from that little sachet, and he is the one who should go down in history." ”

Shen Kang arched his hand again and said, "Old man, thank you for your hard work." After speaking, he waved his hand and said, "Ah Shu, honorarium." ”

Liu Shu hurriedly stepped forward and took out two ingots of silver from his cuffs.

When Old Man Fu saw the twenty taels of silver, he hurriedly pushed his hand and said in shock: "Don't dare, don't dare, this is too much!" ”

Shen Kang smiled and said, "Old man, don't you want to mention this matter in the Japanese history books, saying that Shen is a stingy villain, right?" ”

Old Man Fu was suddenly nervous, but he still returned a piece of silver, and said: "Little boy, don't you dare, you are generous, but we ordinary people can't afford it." ”

Shen Kang waved his hand and insisted: "No, if you don't, you will accept it all, if not, you will not give any of it." ”

Old Man Fu was so frightened by these words that he stopped his hand, and he didn't want it all, wasn't that working for nothing?

Shen Kang picked up the tray with a smile and said, "Spare you a tray, old man, thank you." ”

After saying that, he walked out the door as if he was holding a rare treasure.

Huang Sanyuan followed behind and said with a smile: "Childe's shot is really generous!" ”

Liu Shu said with a smile: "Childe saves on weekdays, and only when necessary, will he be generous." ”

Huang Sanyuan nodded, yes, his son-in-law's clothes are not outstanding, and his clothing, food, housing and transportation are also ordinary, not the person who is used to luxury, his biggest hobby on weekdays is to write in the room, or play the piano in the yard, and then he thought that he sold himself and got twenty taels of silver in return, and he faintly felt in his heart that Shen Kang's love for him was heavy.

It turns out that it is not a habit to be generous, but to distinguish between people and things.

For the first time in his life, Huang Sanyuan felt that he was being taken so seriously, and he really felt that he could not only be a teahouse and sell his mouth.

He is Huang Sanyuan and is a useful person.

Liu Shu sighed lightly and said, "Although I have been following Gongzi for a long time, Gongzi is a profound learner, and the words he said are also unfathomable, just like what Fang just said to Old Man Fu inside, how much do you understand?" ”

Huang Sanyuan jumped out of his excitement at this time, smiled awkwardly, and said: "I won't tell you, the words are clear, and you can understand any word when you take it apart, but if you connect it together, hey, you can't understand a word." ”

Liu Shu sighed deeply and said, "It's hard for you, even I can't understand it, how can you understand?" Remember in the future, listen more, watch more, learn more, play lip service is small, really useful, is big, understand? ”

Huang Sanyuan had already discovered that although Liu Shu was young, he always liked to teach people, for Huang Sanyuan, this was not a big deal, for a literate scholar like Liu Shu, he had the same innate sense of awe as ordinary people.

Huang Sanyuan felt that it made sense, nodded to himself, and said, "Yes, I understand." ”

As for Liu Shu, the big clove of garlic filled in front of Huang Sanyuan was very successful, and he also nodded and smiled with satisfaction.

On the way back, Shen Kang quietly looked at the three gyrocompasses on the table, through this gyrocompass, he seemed to see the invincible Ming Navy on the blue sea, saw the merchant ships coming and going, communicated with each other, and saw the different future of the Ming Dynasty.