"That husband must make this thing." Listening to her cheering words, Zhang Yang looked at the drawings and frowned, in order for this pendulum clock to operate, it needs to rely on the potential energy of gravity.

Keep the object falling slowly while the object is subjected to gravity, and drive the gears to make the pendulum swing back and forth.

With the shaking of the pendulum, the clock can be driven. Zhang Yang wrote down the formula of a pendulum, which is quite difficult to create a combination of mathematics and physics.

It was late at night, and the daughter-in-law went to bed early with her daughter in her arms. Zhang Yang walked to his yard, raised his eyes to look at the starry sky and was silent for a long time, recalling the only remaining knowledge in his memory.

It is necessary to pick up the theorems and formulas that have been forgotten for a long time. This feeling is very painful, if only Zhang Heng were alive.

Scratching the back of his head in pain, the snoring of a bear could already be heard in the yard. After washing up, Zhang Yang went to sleep.

Early in the morning, Zhang Yang walked out of the room wearing a coat and saw his daughter-in-law looking at the formula in a trance. Her gaze looked at the one-way formula as if she was thinking, and after a moment she shook her head again, as if she had given up.

"Do you have eyebrows?"

"It's hard." Li Yue came to such a conclusion.

"I thought so too, so I came to a conclusion last night."

"What conclusion?"

"Unless Zhang Heng is still alive, maybe he can figure it out." So far, the fragments scattered throughout the Central Plains have not been collected, and Li Tai said that he had asked someone to find them, but there has been no news so far.

Zhang Heng's mathematical and astronomical attainments in his life were extremely high, and it would be the best and collectible if he found his fragment to be handed down.

There is not much wisdom that can be passed down through the ages, and many crystals of wisdom have been lost. Since the Layue holiday, to the current New Year, Zhang Yang has returned to his usual idle appearance, dressed like a country man, and his words and deeds have returned to the past.

is no longer as restrained and polite as when he was an official in Chang'an City.

"Damn war! A family of evil gate valves. Zhang Yang scolded in his mouth,

"You will only be self-contained, do not seek the welfare of the masses, and live like a god, ignorant of the suffering of the world." In the morning, the master was scolding again.

Xiao Wu and Xu Hui had just woken up, and the two of them were sitting on a small stool and washing.

"If you don't use wisdom for people's livelihood, but seek benefits for your immediate status, you are the real villain." Throughout the ages, people who want to be immortals will not die well.

Especially those ancestors of the family who have lived like immortals. Even if they are still out and about, let them die a good death, Zhang Yang gnawed on the meat bun fiercely, and continued to focus on the formula, his eyes were bloodshot and meditated.

After thinking about it for a while, I went to do carpentry work. The clock is also considered furniture, and the clock at home can give you a sense of the passage of time, at least you can know what time you go to bed and what time you eat.

Li Yue saw that her husband was almost stunned, and whispered: "The duck eggs at home are gone." Zhang Yang put down the wooden hammer in his hand,

"I'll go to the duck pen in the village and get some."

"Hmm." Xiao Wu saw that the teacher's original nervous expression relaxed a little,

"Is the teacher worried that the master will be in a hurry?" Li Yue nodded and did not deny it. Xu Hui also said: "Well, if your thoughts keep falling into it, you will only get more and more confused, the teacher wants the master to go out for a walk, but in fact, there are duck eggs at home." The two disciples were very smart, Li Yue tied up his own hair, and then helped them tie up their long hair.

After getting ready, Aunt Yang also brought a wooden sword. The three masters and apprentices began to practice swords. Zhang Yang came to the duck pen in the village, and the village was still quiet in the early morning, so he met Li Tai here.

He washed a plucked duck in clean water. Zhang Yang looked at it and said curiously: "His Royal Highness King Wei, are you going to prepare to eat duck in the morning?" Li Tai raised his head and smiled: "I want to grill it on charcoal for half a day, and it is just right to eat it at noon." This fat man's specialization in eating has become more and more in-depth, and the tricks of cooking food have begun to increase.

"Brother-in-law, what are you doing here early in the morning?" Hearing him ask, Zhang Yang lowered his body to pick up duck eggs,

"I've finished eating the duck eggs at home." With their own thoughts, the two of them walked outside the duck pen to reclose the fence and sat on the stone by the ridge.

Li Tai handed over the duck to his guard, and said in a deep voice: "There is news from Luoyang again, saying that Sun Fujia has imprisoned those children of the family for a month and written more than 30 crimes. Zhang Yang sighed with emotion: "It's a good thing." ”

"But some people say that Sun Fujia has detained those children for a month, and ordinary prisoners will not be tortured for a month, thinking that they have been tortured into confessions, even if these charges are confessed by the children of the family, someone will come out to refute them." Zhang Yang didn't reply for a long time.

Li Tai's face was uncomfortable, as if he had eaten a worm,

"Why do they have to reverse right and wrong, when it's black, they have to say it's white, brother-in-law! What's wrong with this world? "Friends have cheated each other and calculated.

After so many years, Li Tai is also sixteen years old before he knows it, and he is at the most critical stage of his life, and he is also the most rebellious age.

Children at this age are in the process of learning about the world. Fortunately, this fat man still knows what is right and what is wrong.

Zhang Yang sighed: "His Royal Highness the King of Wei can say this, I am very pleased. The bear walked lazily through the village early in the morning, sniffing towards the east, and paw away the puppy wagging its tail.

For it, the overlord of Lishan, these puppies don't know whether to live or die.

"His Royal Highness the King of Wei, when those scholars stand up and start opposing the family, it shows that there is still justice in this world, justice is a very magical thing, it will spread in people's hearts, used to overthrow all injustice, and now what they lack is only strength." Li Tai's chin already had a blackened soft beard, and he stammered, "What kind of strength is missing?" ”

"There are many aspects to this power, such as a person who can unite them, just like Chen Sheng and Wu Guang rose up back then." Seeing that Li Tai's expression was wrong, Zhang Yang said again: "Your Royal Highness King Wei, don't be afraid, I'm just making an analogy, at first I also persuaded your father to ask him to stand on the side of the masses, but he has never answered positively, maybe your father also has concerns in his heart." After chatting with Li Tai for half an hour, he also said about the construction of the village in the future, the secret recipe for white sugar has been sent to the palace, and it is impossible for Lishan to continue to produce white sugar.

After the Lantern Festival, the village will officially start work, and the raw materials hoarded last year can now come in handy.

When I walked home, Aunt Wang came with a stone of fine salt with a flat shoulder. She put the fine salt in the courtyard and explained, "This is the queen arranged for someone to send it." Li Shimin got the Tubo Salt Lake, and the last thing he lacked was this fine salt, and with fine salt, he couldn't quickly put this salt on the market in exchange for money.

First, it is necessary to control the price of salt, and second, the DPRK and China need to have control over the price of salt. Salt and iron are the most important weapons of the country, and the DPRK and China must always hold them in their hands.

Zhang Yang listened to the news that Aunt Wang brought back from Chang'an City, because of the matter in Luoyang, Zheng Gong went to meet His Majesty again, and pointed at His Majesty and scolded.

It is said that His Majesty is indecisive, and he should be constantly decisive. Wei Zheng is a very rigid old man, and right and wrong are very clear in his heart.

If it weren't for his persuasion at the beginning, Li Shimin might have really married the woman who had a marriage contract into the palace, thus making a joke again.

The heart of being the emperor is bitter, and Li Shimin, the heavenly khan, is also very bitter. Other people's courtiers are all submissive, and when it comes to the Zhenguan Dynasty, whenever there are some words and deeds that are wrong, he will be taken out by the courtiers to draw inferences.

Today, the rule of the Tang Dynasty is still clear, and the emperor is open to speech and actively admonishes. In addition, the folk customs of the Tang Dynasty are fierce, the military generals are heroic, and the literati are even more willing to cut their bodies.

The matter in Luoyang was delayed, and Wei Zheng attacked Li Shimin hard. In the end, the Heavenly Khan first verbally promised Wei Zheng that he would severely punish the children of the family, but the will to punish him severely has not yet been issued.

Zhang Yang made a gear set at home, and then found an iron ingot from the toolbox, which is the iron material made by the Lishan blacksmith workshop.

The portions are generous, square and well-proportioned. The nails were tied with hemp rope and wound around the gear set, which rotated with every inch of the ingot dropping.

Until the iron ingot hit the ground, Zhang Yang wrote down the weight. Then use a larger gear set and install it on a shelf, because the wire head is wound around the gear set, there is traction This time the speed of the iron nail falling is much slower.

Finally, it half-hovered to a halt. Again, note the number of times the wheel turns. Zhang Yang wrote on a piece of paper on the side that the gravitational force experienced by the object is the product of the weight of the object and its height.

With this formula, the corresponding weight can be calculated by pushing it back once. The courtyard was quiet, and Xiao Wu and Xu Hui were working on the question.

Li Yue watched her daughter's little hands clumsily adapt to the fast son, as if her fingers would be knotted. She wanted to throw away the nasty fast child, but she saw her mother bow her head with a stern gaze.

The child has to take his time to learn to use fast children, and she is only one year old. In the end, I still used a spoon to dig hard and eat the rice.

Li Yue saw that her husband kept thinking, walked to the side and watched quietly, her eyes were soft, and she nodded slightly.

As if to confirm whether this algorithm is correct. Zhang Yang tied a few grams of stones to the iron ingot, and this time the gears continued to rotate for a while.

Until the iron ingot fell, Zhang Yang made a record again. This time, it took ten breaths to land. The husband spliced the wooden strip between the gears, retightened the hemp rope, and as the iron ingot fell under gravity, the gears turned, and the wooden strip began to sway.

"If you let it swing for a day, will it take a day for this ingot to hit the ground?" Zhang Yang shook his head and said: "Not really, if you can make clockwork, you can find a way to make it do the work of rising and falling, but it is very complicated." After a pause, he said: "But I can do three or two clocks to continue to operate in a cycle, and I can splice a few more sets of gears, and the gears are also lossy, and the weight needs to be increased in the process of transmission." Li Yue, who is not good at physics, just listened.

It's not easy to keep up with your husband's thinking. After several experiments, the proportions were calculated, and it was known that the pendulum oscillated once a second, and the periodic formula for the amplitude of each swing could be calculated by determining the length of the pendulum.

Zhang Yang finalized the drawing, which was a large pendulum clock nearly three meters high. This is because to get the object to fall to the potential energy due to gravity, a high enough height is required.

Three meters is enough to turn the pendulum clock for twelve hours. This is only to look at the twelve hours, with the current craftsmanship of Lishan can reach the limit.

It is not without thought of building a huge bell tower so that the whole village can feel the time.

If you really want to build it, it will be more than ten meters high, maybe it will be overrun, and in the Tang Dynasty, the tall tower is not something you can build casually.

It's really a pedantic system. Zhang Yang was disdainful in his heart, and first shelved the plan. After doing this, Zhang Yang sat in a rocking chair and closed his eyes to empty his brain.

With such a complicated operation, it feels like the brain in my brain has become a pulp lake at this moment. Originally, there were still fifteen days of rest, and it took ten days to study the pendulum clock.

Zhang Yang installed a wooden wheel at the bottom of the pendulum clock and pushed it out of his home. Under the surprised gazes of Li Tai and Li Yuan, Zhang Yang looked up at the sun.

The nearly three-meter-high pendulum clock was very conspicuous all the way, and the curious eyes of the surrounding people seemed to have landed on this tall wooden pendulum clock.

The top of the pendulum clock is pointed, and at first glance it is thought to be a strange house. And this weird house has a compass embedded in the middle of the top edge.

Xiao Wu and Xu Hui were waiting for the hour according to the scale of the sundial. At noon, Zhang Yang pulled out the latch, and the lower part of the pendulum clock was hollowed out, and the swing of the long pendulum could be clearly seen.

And with the swing of the pendulum, the minute hand also began to move. Li Yue held the booklet, his eyes went back and forth between the sundial and the pendulum clock, the shadow of the sundial hands moved with the sun, and the hands of the pendulum also moved.

Seeing the noon moment, Li Yue drew the position of the minute hand and the clock, turned a page, and continued to record after another moment.

Fortunately, his efforts did not come to naught, and Zhang Yang said happily: "Congratulations to His Royal Highness King Wei, congratulations to the Emperor, our Tang Dynasty has a clock, this is a great joy." Li Tai and Li Yuan's grandson were both silent.

They can't figure out what benefits this thing has for people's livelihood and society. Seeing him ecstatic again, the grandfather and grandson frowned.

Li Tai stayed away from his brother-in-law, who was so happy that he didn't know why, and leaned over to his imperial grandfather and whispered, "Has my brother-in-law eaten anything dirty lately?" Li Yuan also looked at Zhang Yang, he took Yue'er in his arms and happily circled, and also said in a low voice: "Speaking of which, what did your brother-in-law grow up eating." "It's like Li Xiaogong often talks about it, what the hell is this Yang.

If you want to say that this person is talented, he can also write books such as Red Mansion and Liao Zhai, which are enough to be handed down. If you want to say that this man is eccentric, he is happy to make such a pendulum clock that I don't know what to do.

The joys and sorrows of people are not the same. Zhang Yang created things like a pendulum clock to celebrate that Datang had a clock.

Li Tai shook his head and sighed all the way away, his brother-in-law would sooner or later become a madman in the eyes of others if he continued like this.