"Just calculating to the millimeter is not accurate enough. I think it would be better if I could calculating to the nit calculating, but this period of time I have divided the gods for the Qiantang war, and there will always be various unexpected or unexpected mistakes. Once a little mistake is made, it will be too laborious and time-consuming." Zu Zhi smiled bitterly: "I am forty-seven years this year. I don't know how many years I will live. I'm not afraid of death, but I'm afraid that I can't achieve my wish before dying, and I'm not dead and dying..."

Xu You remembered that Zu Chongzhi lived 71 years old, and was a rare long-lived person in ancient times. No matter how poor Zu Zhu was, he seemed to repeat Zu Chongzhi's life trajectory. It should be fine to live until he was 60 years old, that is, there should be more than ten years of good time. But then again, it is actually a waste to fully calculate the pi. After all, as a veteran, Xu You once wrote pi to forty-seven decimal places with interest. Judging from the practical application in reality, it is enough to be accurate to the ten decimal places. American astronomer Simon Newcomer once said that ten decimal places are enough to make the earth's perimeter accurate to within one inch, and thirty decimal places can make the entire visible universe accurate to a quantity that cannot be distinguished by even the most powerful microscope.

Therefore, the endless calculation of pi is just a later test of computer performance, and it also demonstrates the mathematician's pursuit and exploration spirit of the field of mathematics, but it has little practical significance.

What Xu You wanted Zu Yan to do might be more ordinary or simpler, but for a country and nation, it is more meaningful than the digits of pi!

"Sir, IMHO, the technique of cutting circles is not the best way to calculate pi. Relying on arithmetic alone is both cumbersome and complicated, and it takes a long time, but it is actually not worth the effort."

"How can I not know that after hundreds of years of hard work of all the wise men, at present, only the value of the circular cutting technique can most accurately calculate the rate..."

"There is no need for round cutting techniques. I have several 'styles'. Compared with round cutting techniques, it is simple and clear, and it doesn't have to take years. The highest is the best but it can push the pi to more than 800..."

"What?" Zu Qi suddenly suffocated, feeling his heart almost jumped out of his mouth, his voice suddenly became sharp, and he said, "More than 800?"

"Yes, more than 800!"

Xu You remembered that Ferguson calculated π to 808 digits, which was the highest record of manually π calculation. Then came the computer era, and the π value began to grow wildly geometric multiples, which was beyond the reach of manpower.

Although Zu Yan had a high evaluation of Xu You's calculating level, he spent half his life to calculate the pi to the millimeter, which is the fifth place. When Xu You touched his lips, he had more than 800. It was simply incredible and it was really unbelievable.

His expression was more like seeing ghosts than seeing God!

Xu You smiled and said, "If I lie, I can say that there are ten or twenty, and there is no need to use more than eight hundred to arouse the Mr.'s doubts. In this way, the Mr. pushes the millimeter to nine, and I will first reveal the number of seconds and hur... the second is two, hur is six! After verifying the second, then choose not to believe me!"

Zu Yan was completely moved by Xu You's strong confidence when he spoke, and couldn't help saying, "Okay, I can use it for one more year at most to deduce the number of seconds. Then come and ask your husband for advice in person!"

"One word is certain!"

Xu You and Zu Yu slapped their high-highs as a sworn, then talked about the serious matter and said, "I came to Qiantang this time to ask the sir to help build a stone cannon!"

The stone cannon is a trencher, which is not a rare thing. It has been used by warriors in siege battles for many years. Zu Qiqi said: "There are stone cannons. The Lieutenant Colonel's Office has built dozens of stone cannons for use in the army, but Qiantang is hard and has no use..."

"The stone cannon I mentioned is not the kind you use now, but a kind of improved stone cannon. I named it Thunder Cannon!"

"Thunder cannon?"

Xu You took out the drawings drawn in advance from his arms. Zu Yan was full of doubts. The catapult had been developed for thousands of years. The part that should have been improved had long been improved by countless skilled craftsmen. If it were not for the preparation of the previous debate, Xu You would have been arrogant and said that he had created a new stone cannon, he would have been driven out directly. How could he talk about studying his drawings?

However, Zu Qi now respects Xu You very much, so he took it over and watched it carefully. First, he frowned. When he encountered something confused, he asked Xu You to explain it. Then his brows gradually stretched, and then his eyes were flickering, as if he was about to shoot out light. After a while, he sighed: "Mr. is extremely talented and both civil and military. He is the best person in this world that I have met!"

He has never flattered himself. He can say such words smoothly without blushing, which means that he really admires Xu You. However, after a turn of words, he implicitly advised him: "Such stone cannons are only used to kill people and seize the city. If one stone is fired, there will be no casualties, and it may hurt Tianhe. The husband is a talented man, and he should not be obsessed with it and ignore the great way."

"What the gentleman said is very, and the calculations are endless. These are all small skills, which are not enough to laugh at. If the war in Qiantang was not delayed for too long and affected the country's foundation, I wouldn't be too lazy to study these killing tools!"

The two of them discussed the specific details of the thunder cannon. Xu You knew the general method of making, but the selection of rod arms and tendon ropes belonged to ancient secret methods, which required the cooperation of people like Zu Zhi. After careful argumentation, Zu Zhi put forward practical modification opinions on adjustment and control. In view of the current military situation, the weight of the stone cannon originally designed by Xu You was reduced from 800 kilograms to 400 kilograms, and the range was increased from 200 meters to 300 meters. Even so, it was countless times higher than the human-powered traction catapult used by the Chu army, which weighed only 80 kilograms.

The most important thing is that the Thunder Cannon is the first counterweight catapult to appear in this time and space. It can be operated perfectly with just a few people. Compared with the scale of human-powered catapults that can often be dozens or hundreds of people, it can be said to have a leap forward to improve efficiency and practicality.

Zu Yan is worthy of being the best mechanical manufacturing master in Chu. In just five days, he built the basic framework of the thunder cannon based on the existing catapult. After a preliminary test firing, it proved that Xu You's idea was sufficient and feasible, and then reported to Xiao Yushu according to facts.

Xiao Yushu was ecstatic and immediately entered the Wohu Division. He transferred Meng Xingchun's direct backbone from Wu County to be responsible for the intelligence system of the Fengmen. He also sent a thousand middle army to strictly protect the location of the Lieutenant Colonel's Office. All matters regarding the Thunder Cannon were listed as top secret. People who came into contact with this matter must be in groups of three or five. Anyone who acted alone would be executed without regard to the reason. He unconditionally met all the requirements put forward by Zu Zhi and Xu You, asking people to give them, things to things, and money to pay. It took a month to finally build the first real Thunder Cannon.

After the test firing in the hidden valley, Xiao Yushu was shocked by the power beyond imagination and immediately ordered the expansion. At the same time, the siege attack did not stop, but the strength and strength were not as strong as before. The white thief huddled into the city, with more defense, but he was not able to leave the city to fight in the field. After two months of stalemate, the court finally couldn't bear it and sent the Censor Wang Chun as the military supervisor to the military supervisor to Qiantang.

Wang Chun had always had a disagreement with Xiao Xunqi, believing that the existence of the Sili Mansion was contrary to the way of a saint, and supervising all officials and causing everyone to be in danger. It is a bad policy and should be sacked and appeased the people. Xiao Xunqi had a high position and was of great power, but he never cared about him. He neither wrote to himself to defend himself nor retaliated. Letting him write to the sea every time he wrote to the stones, which was also a major story of the Chu Dynasty.

Wang Chun had no choice but to deal with Xiao Xunqi, but it was natural to deal with Xiao Yushu. The military censor of Chu State had great power and could report it to the master secretly when he saw and heard in the army. His words were slightly modified and he poured a few basins of dirty water, which was as easy as a backhand.

Just two days after entering the military camp, Wang Chun found an excuse to whip Xiao Yushu's deputy guard in public, and slapped Xiao Yushu in the face naked, arousing great anger among the members. Xiao Yushu became famous as a young man. After years of hard work, his edges and corners had been worn out, and he was not angry. He avoided Wang Chun and let him make trouble in the army, but sent someone to stare at him secretly. Unless the trouble was out of control, he would let him go.

After seven or eighth days, on the third day of June, Wang Chun broke into the tent of the coach and rushed to the front of Xiao Yushu's case, and said angrily: "General Xiao, you are not in the camp these days, where have you been?"

Xiao Yushu said calmly: "I don't seem to need to report to the envoy!"

"Hmph!" Wang Chun said coldly: "I am ordered by the imperial guards to conquer all military affairs. You are the general of the Eastern Expedition. You are the grace of the Lord and the hope of the government and the people. How can you go out day and night, just take possession of prostitutes and play and lose your military affairs?"

Xiao Yushu smiled and said, "It seems that someone secretly complained to the Imperial Master Wang. Let's hear, how can I hijack the military affairs?"

Wang Chun was heartbroken and pointed at Xiao Yushu, scolding: "My sincere advice, you are not only unrepentant, but you are not ruthless and arrogant. Okay, when I report to Jinling, I will see what your fate will be!"

Xiao Yushu picked up the cup and drank water, and said, "I'll wait!"

What makes people more embarrassed than being angry and harsh, is this indifferent attitude. Wang Chun almost burst into anger and said, "Don't think that with Captain Xiao as his backer, you can do whatever you want. Let me tell you, this court is the lord's court, this world is the An family's world, not your surname Xiao! You command an army of 150,000, and in addition to the central army, there are two thousand sword scatterers. Such troops took five months to conquer a mere Qiantang City. Xiao Yushu, if you say you are not a bandit, who can convince the world?"

"Bang!"

Xiao Yushu stood up, and the eighteen corpses in the separate tent immediately held their swords in their hands, with a cold light pointing, and the murderous aura was so fierce that they were afraid that they would have been so scared that they were powerless. What a good Wang Chun, not only was he not afraid, but he laughed to the sky and said, "Kill me? Xiao Yushu, your rebellion has already appeared, and you can surrender now, and maybe you can still save your life. If you resist stubbornly, the disaster of the destruction of the clan in the future will be near!"

Xiao Yushu waved his hand, and the soldiers were sheathed. He walked from behind the desk. He was tall and one head higher than Wang Chun. He looked down at the other party and said, "If you are not afraid of death, follow me to the front of the two armies. At midnight tonight, I will personally lead the central army to attack the city. Tomorrow is dawn, I want no more white thieves in Qiantang City!"

"ah?"

Wang Chun was as stupid as a wooden chicken and did not come back to his senses for a while.
Chapter completed!