Chapter 11 Pendulum cycle

Mao Geng currently only thinks of heavy hammer wall clocks. I don’t know if there is a spring in this year, and there should be no clockwork. So the energy storage device should be made with a suspended heavy hammer, and the escapement mechanism should be made with the simplest single pendulum escapement mechanism. In fact, the clock that appeared in 1350 was a heavy hammer single pendulum clock.

Among them, the single pendulum escapement mechanism is the core mechanism of this kind of clock, but you can understand the principle of it yourself and you can create a practical escapement mechanism through drawing design, simulation on the drawing, and repeated experiments.

The principle of pendulum was learned by every high school student in later generations, and it is really the most basic physics principle. Mao Geng often saw pendulum clocks or wall clocks in his previous life in the 1980s. Anyway, when he was in middle school, he talked about pendulum teachers, taking pendulum clocks as an example. The teacher said on stage: The pendulum in a vacuum will sway back and forth, and the time of each swing is absolutely equal.

Of course, the single pendulum that can be placed forever without external force is only in ideals, because reality is neither vacuum nor zero friction. At this point, the physics teacher clearly revealed that there is a big gap between ideals and reality, but as a student, Mao Geng in his previous life did not realize the harshness of reality. Until the ideal hits a wall again and again in reality, Mao Geng then feels that life is really like a single pendulum, and the meaning of placing it over is that the difference is only that some people are placed high and some are placed low. However, in reality, you have to constantly overcome the ubiquitous resistance in order to continue to put it.

OK! The principle of a pendulum clock is that simple! The so-called pendulum escapement mechanism has two most important components, one is an escapement wheel with a circle of equidistantly arranged sharp teeth on the rim, and the other is an escapement hook with left and right hook teeth. Simply put, the energy storage device - the most primitive one is a heavy hammer that continuously drops and releases potential energy - transmits the driving force to the escapement wheel. After the escapement wheel obtains the driving force, it will rotate as soon as possible, but the escapement hook driven by the pendulum passes through

The two hook teeth on the left and right set a limit on the rotation of the escape wheel, that is, every time the pendulum swings, the hook teeth on the right release a grid of escape wheel teeth, allowing the wheel to rotate one grid - this is called longitudinal - it can be understood as stepping on the accelerator. After turning one grid, the hook teeth on the left then stuck another teeth on the escape wheel to stop the escape wheel - this is called capture - it can be understood as stepping on the brake. Until the pendulum swings again, and then repeats one longitudinal and one capture again, and this cycle is repeated.

Anyway, when the escape hook is one by one, the escape wheel cannot rotate continuously, but can only rotate intermittently. Every time the pendulum swings, the escape wheel rotates for one square. In theory, the time for each pendulum swing is the same, so the interval time for each rotation is also equal, so it has the timing function.

Those who have driven an automatic wave car can imagine that if you just hang the automatic gear, the car will idle without recharge, and the car will move forward without pressing the brake. Then you will release the brake intermittently and step on the brake again. This way, you can experience the feeling of being one after another, and you will probably understand what the escape mechanism of the mechanical clock is.

The single pendulum clock uses the principle of equal time for single pendulum reciprocating swings to achieve equal time for each escapement. The evolved mechanical clock uses a gosspring escapement mechanism, which can greatly reduce the volume.

Another design mystery of the single pendulum escapement mechanism is that the escape wheel must also transmit the driving force to the pendulum through the escape wheel teeth, so that the pendulum can always maintain the swing and the cycle can continue.

As long as this escapement mechanism is created, the others will be auxiliary mechanisms, such as gear ratchets, and so on, which will no longer be difficult. For Mao Geng, those are just a little more workload.

In the past two days, Mao Geng began to draw pictures based on scattered memories. In fact, only the principle is remembered well. The structure of the practical pendulum escapement mechanism cannot be restored by memory, so it can only be redesigned according to the principle. Of course, the design is not easy. It is necessary to simulate the motion trajectory on the diagram, as well as the interaction force analysis of the hook teeth and the pointed teeth, so as to design a structure in which both the motion trajectory and the interaction force can meet the pendulum escapement requirements, which cannot be completed in a short while.

Relatively speaking, the water transport instrument table built by Su Song is much easier to implement in design. The water transport instrument table is said to be the first equipment in history to use an escapement mechanism to time. According to legend, the time interval between water transport instruments is determined by filling a fixed volume of water buckets. As long as the water level of the water source filled with water buckets does not change, the time for filling the buckets is a constant value. After filling a bucket of water, the water transport instrument timing mechanism is driven to perform an intermittent movement - this is "longitudinal", and then there is a corresponding brake mechanism to stop it in time - this is "grabbing". The filled bucket is then emptied, and an escapement cycle is completed in this way. When the next bucket is filled with water, the next escapement cycle begins, and this cycle is repeated to achieve the timing function.

This was during the Song Dynasty. Su Song's wisdom was unique and designed and created the water transportation gazebo that was recorded in history, which was enough to make future generations look up to.

Su Song was a Jinshi in the second year of Qingli. He served as the Minister of Justice and the Minister of Personnel. In his later years, he joined the cabinet to serve as a minister. In his eyes, he was a god-like existence. Su Song's "New Etiquette and Fa Yao" about the Water Transportation Essay Station was even more magical in the minds of Mr. Wang. However, the Mao family boy said that the Water Transportation Essay Station was huge because of its size. According to the order of the teacher, he even claimed that he would build a timekeeping mechanism the size of a book box within one year. There was no confidentiality on this ship, and this shocking and important news immediately spread to the brothers of Mr. Wang.

The two brothers then formed a private meeting.

Mr. Wang said:

"Do you think this Mao family guy is a bit too arrogant? He dares to say such big words as Su Song who is beyond the heavenly beings!"

Mr. Wang thought in his heart that he believed in others just by relying on the words of the Mao family and the Wen boy, and Baba went to Xinhua. However, his worries were not let go of them all the way. He heard this and felt even more hesitant, so he said:

"Can this Mao Geng be a liar?"

Mr. Wang shook his head again and said:

"It's not like it! It's because Su Song took more than three years to build a water gazebo platform. The boy from the Mao family actually boasted that he would create a magical tool that surpasses the water gazebo platform within one year! This is absolutely impossible. He said that he didn't look like a liar, because he taught Qin Yanqin to sing Li Yu's "Yu Meiren" and sang out of tune by himself, and even said that the person who learned was out of tune, must be learned from others. Unfortunately, this person has a poor understanding and learned a non-donkey or a horse. From this point of view, it's true that the boy from the Mao family has a master."

After hearing what my brother said, Mr. Wang was already a hundred people in his heart who didn't want to see Mao Geng being a liar. Since the brother said that Mao Geng had a master, it is true that according to logical reasoning, without music scores and out of tune, it can only mean that Mao Geng himself is not the composer, and having a master is a reasonable explanation.

Just the master exists, Mr. Wang immediately said:

"That's right, if you want to talk about that tune, it's also wonderful. But the boy from the Mao family didn't learn it, so he made a laugh here. Unexpectedly, Qin Yin realized some of the wonderful things of the original song from his out-of-tune tune, which shows that his master is indeed very clever."

Mr. Wang nodded and said:

"Well, I guess, the master and the master of the Mao family may have their own skills, maybe his master is good at writing lyrics, and the Xin Qiji taught him is a master of the lyrics, and the master of the Mao family may be good at compose music. However, the Mao family has limited qualifications and has no chance to inherit the master's composition skills. His master's song is easy to tune and goes off the tune. It's a pity and ridiculous!"

Mr. Wang was in a relaxed mood at this time. His brother's guess was that he actually believed that the Mao family's master's affairs were not false, so he followed the trend and expressed his own speculation:

"I heard from my brother that everyone has different talents. The talent of this Mao family boy may not be in the rhythm. You see, he is not very good at speaking. You can imagine that he has no talent in the rhythm of eloquence. However, he is very good at teaching the boy, or he has some special talents in the field of machinery and equipment, which is also possible."

Although Master Wang is honest, he has seen countless people in his life and has knowledge. People in the world have different talents. Of course, this is not wrong. Master Wang remembered the incident of the test boy at that time and said:

"I'm talking about it again. The Mao family's test was a question from one plus to one hundred. Even if it was calculated using paper and pen, it would probably take half an incense stick. However, according to the Mao family's trick, it doesn't even take a cup of tea. In this way, perhaps his master is really very clever, and he can even surpass Su Song and make clever instruments. It is unknown."

The two of them whispered for a long time and finally came to a consensus conclusion that the Mao family's master had an extraordinary origin. The Mao family's younger brother was short of his oral talent, but was good at organs and mathematics, so he still had knowledge.

Since then, Mao Geng has been respected more, and even a rude woman like Wang Qinqin calls her "Mr. Mao", which makes Mao Geng feel a little proud. However, Qin Yan and Qin Yin are also called Mr. Mao, and Mao Geng feels a little awkward. He feels that he doesn't seem so reckless when he called him Brother Mao before.

The group passed through Dongting from the water, passed Changsha, and went straight to Luokou, Xiangtan. They took the land route at Luokou, and five days later they arrived at Shangmei Town, where Xinhua County was located.

But when we arrived at the temporary resettlement site, after we settled the crowd, only the local police arranged food and accommodation to maintain order. The two tolls from Chuzhou went to see Zhubu Guo with Brother Zhang.

Brother Zhang was originally a remedial person who moved to Xinhua from Shandong two years ago. He once learned from his uncle for a while. Although he didn't know a few words, he remembered them very well. In this era, he had to memorize the comments thoroughly. It was not possible to read the comments on the comments on the stage. It was precisely because of Brother Zhang's eloquence that he became a sergeant in Xinhua. His main responsibility was to recruit Han people to settle in Xinhua.

Xinhua has been naturalized for a hundred years since the Xining period. It has been a situation where Han people, Yao people, Dong people, and Tujia people live together. However, there are still few Han people. Xinhua has been absorbing Han people to settle down over the years. However, there is a reputation as a barbarian land, and many people regard it as a fear of their own, so there are very few people who come here to settle down.

But last year, a large-scale armed fight between the Yao people and the Han people occurred. The cause was a battle for a carbonite vein. The Yao people and the Han people were incompatible. Hundreds of people were dispatched to fight. In the end, the Yao people had the upper hand, and hundreds of people died and injured. Since then, all the Han people in the ten-mile radius moved to Guiyang to smelter the mine and mine silver.

As a result, there were even fewer Han people willing to move in.

As a last resort, Master Guo had no choice but to use new tricks, focusing on recruiting the corrected Han people to settle down, and sending people like Brother Zhang with outstanding eloquence to the sidelines to promote, and trying every means to cooperate with the local government to recruit. Once this trick was made, it was indeed very effective.

After listening to the report, Zhuzhu Guo was very unhappy when he heard that the county could add more than 100 Han people’s household registrations, and there were also well-educated people in it. Then, Zhuzhu Guo opened Zhuzhu Lin’s letter and read it.

It doesn't matter if this is obvious. The chief clerk Guo saw the names of Mao Geng and Wen Yuan. The letter reminded that these two people had some unknown origin and had to be careful.

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Chapter completed!