To Ye Chang's expectation, this question only stumped Zhang Xiu for a while. Then he took out some bamboo sticks from his bag, divided three times, five divided by two, and reported the correct answer. Ye Chang was surprised. Looking at Zhang Xiu¡¯s eyes again, there was something different. The Chicken and Rabbit in the Same Cage question is just a preliminary question, but this water-filling question is much more difficult. In this era, anyone who can solve this kind of problem can definitely be called a mathematician. What mathematicians were there in the Tang Dynasty? ¡°At least in Ye Chang¡¯s memory, he can¡¯t recall any well-known mathematicians in the Tang Dynasty, let alone Zhang Xiu Maybe in history, he died in obscurity without leaving any traces? Since ancient times, there have been many wise men and sages in China. Among them, only a few are known to future generations, and most of them are like ordinary people and have disappeared in the long river of history. "Are there any more questions?" After finishing this question, Zhang Xiu was eager to try: "Can it be harder?" Ye Chang pondered for a while, then reported a set of numbers, and among this set of numbers, there was an empty A group. This is a permutation and combination question. You need to find the pattern of this series of numbers, and then calculate the vacant number based on this pattern. Like the previous two questions, this question still tests logical thinking ability. This time Zhang Xiu pondered for a long time and fiddled with the calculations in his hands for a while, but in the end, he still reported the correct number. "It's amazing, it's amazing." Jia Maoer originally looked down on this thin and handsome man, but at this time she couldn't help but raise her thumb. He is a discerning person. It is obvious that Ye Chang intends to recruit this person. If this is the case, he will naturally help him. "Congratulations on the way of arithmetic. I'm afraid no one can compare with me except Ye Langjun. Tsk tsk, it's amazing." They can calculate the changes in the stars." Ye Chang just laughed at Zhang Xiu's words. This was obviously a boast, but Jia Maoer frowned over there. Unlike Ye Chang, who has stayed in Chang'an for less than two months, Jia Mao'er has stayed in Chang'an for more than thirty years. He knows many allusions that others don't know. "Wait a minute, you just said that your uncle is Zen Master Dahui. Could it be that he is Yixing Master?" The name Yixing made Ye Chang's face move with horror. "If we say that among the astronomers of the Tang Dynasty, the one who left a great name in later generations, probably apart from Li Chunfeng, is this monk and his entourage. However, Ye Chang was curious. Yi Xing was the Buddhist name of this astronomer in the Tang Dynasty. What was Mahamati? "It's my uncle." "Dahui is Yi Xing?" This time, Ye Chang no longer concealed his surprise. "Yixing is the title of the Dharma, and Dahui is the posthumous title of His Majesty." Jia Maoer whispered: "I also remembered Liang Lingzhan. He was once the imperial edict of Jixian Palace, and he and Yi Xingshi both have ingenious skills." Ye Chang At this time, I also vaguely remembered that a group of people had worked with a man named Liang Lingzhan to build a water-transporting armillary sphere, which used the oldest escapement. Others don't know what the escapement means, but Ye Chang knows it very well: a clock. And What significance does a clock have in this era of relying on hourglasses to tell time? What significance does it have for the great navigation industry that Ye Chang wants to develop? What significance does it have for accurate military operations? Even if it makes money, the watch industry It will become a huge source of wealth. Unexpectedly, this thin and handsome Zhang Xiu would be Yi Xing's nephew. Yi Xing passed away more than ten years ago, at the age of forty, and Liang Lingzan, who collaborated with him, has also passed away, so for a while, Jia Maoer I didn't want to come straight. When asked about Zhang Xiu¡¯s identity, he was indeed the nephew of a layman. Although Zhang Gongjin, Duke of Tan among the twenty-four heroes of Lingyan Pavilion, was his great-grandfather, in fact he was only the great-grandson of Zhang Gongjin. The Zhang family, which has flourished to this day, is still a prominent official in the Tang Dynasty, and it is also the custom at this time for the whole family to cling to their family. Zhang Xiu is the nephew of Yi Xing. After Yi Xing became famous in Chang'an due to Li Longji, he followed Yi Xing as a novice monk. Influenced by Yi Xing, he loved arithmetic and mechanics very much. After Yi Xing's death, he followed Liang Lingzhan. But after Liang Lingzhan passed away, he was left homeless, relying on the help of his tribe for a living, and studying arithmetic and calendars on his own. "Where are the craftsmen who built the water-transporting armillary sphere, the ecliptic traveling instrument and many other artifacts now?" Ye Chang suppressed the excitement in his heart and asked calmly. Those people are the most precious wealth of this era. In this era, those who can write poetry and paint are talented people. However, these talented people can only create spiritual wealth. They can indeed be immortal, but they do not contribute much to the progress of the entire society. Of course Ye Chang respected them, but if Ye Chang had to choose, he would rather recruit more craftsmen to study machinery together. "workMost of the craftsmen will be the supervisor" Zhang Xiu's words made Ye Chang disappointed. "What's going on with the general being the supervisor? "With a glimmer of hope, Ye Chang asked Jia Mao'er. He knew that the General Supervisor was an organization that managed craftsmen's affairs, but some details still needed to be asked from people of this era. Jia Mao'er was familiar with Chang'an City and had no idea about the General. The supervisor was familiar. He explained in detail, and Ye Chang nodded repeatedly. It turns out that the general supervisor and the Shaofu supervisor in the Tang Dynasty were the two major agencies that managed craftsmen in the central government. Most of them used criminals as craftsmen, and the number of craftsmen under their jurisdiction was very large. There are 15,000 craftsmen among generals and 19,850 craftsmen in Shaofu. This does not include the craftsmen controlled by local prefectures. Moreover, Shaofu and Generals are specially trained. New craftsmen. Each apprentice's completion time is clearly defined. In his "Six Codes", it is stipulated that an apprentice must complete the study for as long as four years and as short as forty days, otherwise he will be punished. Craftsmen such as gold, silver, copper, and iron, because of their complicated craftsmanship, require a four-year apprenticeship, while weaving and making hats require nine months. Ye Chang knows that they belong to the generals and the Shaofu. It is impossible for craftsmen to have personal freedom. He wondered whether he could get a group of craftsmen through Princess Yuzhen, but he immediately rejected this idea: Princess Yuzhen also has selfish motives. The ball market is an example, and he got it through her. It's hard to say who the craftsman is loyal to. Maybe the craftsman was summoned by Princess Yuzhen just after he developed his new craft. He doesn't mind if Princess Yuzhen or other members of the Li Tang clan join him in starting a new industry. - He also needs the industrial bourgeoisie to grow rapidly and replace the agricultural bourgeoisie to gain mainstream status. However, the prerequisite is that the other party is tied to his interests, such as the knights brought by Jia Maoer. The interests are too independent and sometimes conflict with Ye Chang's interests. Therefore, Ye Chang will not consider starting a new cooperation project with her until he has enough power to protect himself. "There is no way." Please come" Thinking of this, Ye Chang scratched his head and sighed. "If Ye Langjun wants to invite me, it's not impossible. "Zhang Xiu suddenly said again. "Ah? " "The craftsmen who made the water-transporting armillary sphere were all named on the armillary sphere and had great achievements. Later, the saint granted amnesty twice, and their names were removed from the criminal record and listed as miscellaneous households. " Ye Chang was overjoyed when he heard this. "The household registration system of the Tang Dynasty is very particular. You don't have to get away with a criminal record, but miscellaneous households are different. Although miscellaneous households are also craftsmen and have difficulty participating in the imperial examination, at least relocation and employment are not as troublesome as having a criminal record. They don't need to Go through the government channels that are too deep ¡°Do you recognize them? " "In the past two years, Mr. Liang passed away, and there have been less contacts. In the past, when Mr. Liang was still alive, I often went to see them. " Ye Chang is very satisfied. Zhang Xiu is not only a research-oriented talent, but also has such connections among craftsmen. "I have a new book, please read it first. " Ye Chang did not say anything directly to Zhang Xiu, but summoned Chunming and asked him to get a manuscript from his study. After a while, Chunming ran over and handed the manuscript to Zhang Xiu. " Zhang Xiu When he opened it, he found a long text written by Qu Yuan on "Tian Wen". Although Zhang Xiu was not interested in poems and essays, he was very familiar with Qu Yuan's "Tian Wen". , had spent a lot of effort to answer the questions in "Heavenly Questions" Zhang Xiu glanced at Ye Chang in surprise, could it be that Ye Chang actually had answers to these questions that had stumped so many smart people? Chang smiled. When he was teaching in another life, he lived among the vast mountains. Qu Yuan's "Tian Wen" and Liu Zongyuan's "Tian Dui" were also the articles he memorized when he was lonely. Liu Zongyuan lived in a different era. Not long after this time, Liu Zongyuan's Heavenly Duel, if someone who didn't know it saw it, would really think it was shocking, and he would definitely be punished by the government. However, although Liu Zongyuan was demoted, it had nothing to do with this "Tiandu". Relationship. But Ye Chang didn¡¯t take out "Tian Dui" for safety reasons, so when Zhang Xiu turned to the second page, it became what he was interested in. "Hot and Cold?" " The second page is about heat and cold. Based on the experience summarized by carpenters and others, Ye Chang pointed out that the deformation of furniture in winter and summer is the result of thermal expansion and contraction. Then he boldly proposed that there is not a vacuum around people, but a vacuum. There is air, and the air expands and becomes lighter when heated, just like a boat floating on water, holding up the sky lantern. When the candles in the sky are extinguished, the air becomes cold again, so the sky lantern falls down. "After we said goodbye to Chang'an, I thought of this problem. , the guess is this result, and then several experiments were conducted, which corroborated the results. "Ye Chang said again. "It turns outit turns out that this is the truth. Is there energy around us? Zhang Xiu thought for a while: "Indeed, there must be air. When we inhale and exhale, it is air flow. If a hollow bag is stuffed into water and pierced a hole, there will be bubbles overflowing."?Also, the balls in the capital are also filled with pig urine" In an instant, he entered the state and began to mutter to himself again. "Ye Chang knew that he would sink into this book. It was originally a textbook written by him to teach students some common sense of physics. As for Qu Yuan's "Tianwen", it only stimulated students' enthusiasm for exploring the unknown world. If any literati accused him of teaching something unrighteous, it would be wrong. I could use this as a excuse. But I never thought that the textbook manuscript would already have readers before it was compiled into a few pages. "Brother Mao'er, I'm afraid I'm going to trouble you to go back to Chang'an." "Ye Chang turned to Jia Mao'er and said, "As many craftsmen as you can invite, I will invite as many as you can for me. If you can't invite me, their nephew or apprentice can do it. As for wages, you can decide as you like within a hundred years. " "Bai Guan? "Jia Maoer was surprised. "These craftsmen only get some rice and grain to work for the imperial court. They don't get any wages. They just continue to do some work on weekdays and are exploited in many ways. If you can really give them hundreds of dollars, you can only I¡¯m afraid that everyone will come crying and shouting. ¡°Yes, you should control the number and don¡¯t cause too much trouble. This matter needs to be kept secret. "When Ye Chang said this, he winked at Jia Mao'er. Jia Mao'er understood and nodded. Although those craftsmen were pardoned and became miscellaneous households, after all, they were named as Shaofu craftsmen. , it is impossible to get out of Chang'an City. Ye Chang's intention is to let him use extraordinary means. For tens of thousands of craftsmen, running away is something that happens every year, and the court will not be too worried about it. Check. Among them, illegal methods such as bribery and private customs clearance are inevitable. For Jia Maoer, this is a familiar path. "The placement of these craftsmen" Ye Chang thought about it. It is impossible for these craftsmen to be placed in Wolong Valley. There are many people coming to stare at Wolong Valley. Secondly, it is because the space in Wolong Valley is small. If there is a school, there is really no room for these craftsmen. It seems that it is necessary to expand further in Busan. Ye Chang is not convinced. I am very anxious. Fushan is a branch of the Taihang Mountains. There were once a hundred thousand mountain bandits hidden in the Taihang Mountains. Even now, there are also foreigners in the mountains. Another valley was opened not far from Wolong Valley and a craftsman area was built. Adding a guard was just a good way to train the children of the clan and let them learn to do some practical things. He had already had the idea of ??expanding Wolong Valley, so after thinking about it, he thought of the location, which is about four miles away from Wolong Valley. It is in a valley, sandwiched between the mountains and Wu Zepi, with a lake on one side and mountains on the other. The transportation is very inconvenient, so a ferry will be set up to facilitate confidentiality and guarding. Ye Chang was thinking about these details. Suddenly, Zhang Xiu suddenly jumped over, his movements were even faster than Monk Shanzhi. He grabbed Ye Chang and said, "What's behind, what's behind, is there anything else?" " "Ah" It turns out that the book Ye Chang compiled in the past few days was only a few pages. Zhang Xiu quickly read it and couldn't stop, so he naturally came up to Ye Chang and asked for an update. Ye Chang was stunned for a moment, and then smiled. The look on the other side made Ye Chang understand that this guy was on board with him and the boat. Now that he was on board, he couldn't even think about getting off again. However, at this moment, he heard something outside. There was a commotion, and then a man and a horse were seen galloping towards him. Although he was good at running, he couldn't run, and the distance between them was getting farther and farther. Ye Chang stopped with a screeching sound. The wax pole in Shan Zhi's hand had almost hit the passenger's face. The passenger turned over and dismounted, then bowed to Ye Chang and cried: "Ye Langjun, help me."