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Chapter 4 Du He's decision to change Datang (II)

"Regarding this voyage, the minister has a question to ask Lord Xiao Du. Pen ~ Fun ~ Pavilion www.biquge.info" Just after Li Shimin compromised, Li Ji, the secretary of the Ministry of War, suddenly stood up.

Du Hehui glanced at his former boss and said with a smile: "Lord Shangshu, it's okay to say it directly!" ”

Li Ji said in a deep voice: "I remember that when Emperor Wu of the Han Dynasty developed the Silk Road, he went through a lot of hardships. This sea is far less difficult than the land, although as Wei Xiang said, the navigation is convenient, and the sea extends in all directions, without any danger. But because of this, there can be no marked places, the sky is high and the sea is endless, how can the crew of a long journey ensure that they do not get lost at sea? This is the route between countries. It takes at least a month to make a trip. When sailing, you may also encounter strong winds and waves, and so on...... And how can you be sure that the route is correct or not? Is it just Sinan? Lao Chen believes that if this problem cannot be solved, there will be great risks on the Maritime Silk Road. ”

As a famous general, Li Ji is very sensitive to the direction of the terrain, and realized the biggest shortcomings in the development of the Maritime Silk Road at the first time.

Li Ji's words made Li Shimin frown, Wei Zheng, Fang Xuanling, Du Ruhui, Chu Suiliang and other famous ministers also found the seriousness of the problem, and pondered one after another, if the problem in this direction is not solved, the navigation matter cannot be implemented. They are all good ministers with real talents and learning, and when they encounter problems, they do not deny this decision, but think about how to solve them.

No important decision can avoid mistakes in the details, and if they are solved, they will be effective, and if they cannot be addressed, they will mean failure.

Duhe has long taken this into account, as a veteran fan of the Age of Sail game, a history teacher, and a certain understanding of the world's maritime history. The reason for the rise of European navigation is that the compass invented by the Ming Dynasty was obtained, and with the compass that accurately distinguishes the direction, the movement of navigation that touches the world will develop vigorously.

According to historical records, the real development of the instrument to identify the direction lies in the Song, Yuan, and Ming dynasties, the Song Dynasty's compass fish eliminated the Sinan that has been used, the Yuan Dynasty due to the vast land range, the navigation industry developed, and further improved the compass, and the Ming Dynasty China's navigation industry has been at the top of the world, there was a historical event of Zheng He's voyage to the West, and the famous sea weapon compass was also born in that era.

This point of the Tang Dynasty is slightly insufficient, because before the Tang Dynasty, there is no navigation at all, the tools for pointing the direction are still Sinan, although there is some improvement, but because of the little use, the effect can be seen.

Although Sinan is an extremely great invention, after all, it is something thousands of years ago, and there are many shortcomings, and it is not very accurate, so it cannot be used for navigation.

Du He listened to Li Ji point out the key at this moment, and said with a slight smile: "This kid has already taken this into account, and has already started researching, according to Sinan's principle, he wants to invent a compass needle that is 100 times more accurate than Sinan." Can be used for nautical ...... Here you can show the ministers a gadget, which can be regarded as the predecessor of the compass needle! ”

He took out a semi-circular ball from the official sleeve, the sphere was made of glass, and there was a suspended magnetic needle in the transparent glass ball, one blue and one red, pointing north and south, which was a delicate compass.

Coincidentally, Du Ho was a history professor before the crossing and used to teach junior high school history. Junior high school history is the knowledge of thousands of years of Chinese history, which naturally involves China's four major inventions, and in this lesson, he specially made a concise compass to teach students.

For the knowledge that has been specially investigated, the production of the compass is recorded in the famous Southern Song Dynasty scientist and reformer Shen Kuo's "Mengxi Bi Tan", which is the water float method, the bowl lip rotation method, the nail rotation method, and the wisp suspension method.

The water floatation method is to put a few rushes on the surface of the water through a magnetic needle, which can indicate the direction. The bowl lip rotation method and nail rotation method are to rest the magnetic needle on the edge of the bowl mouth and rest on the nail cover to indicate the direction. As for the wisp suspension method, it is to apply some wax in the middle of the magnetic needle, stick a piece of silk, and hang it in a place where there is no wind, and you can indicate the direction.

The book compares the four methods, and points out that the biggest disadvantage of the water float method is that the water surface is easy to shake and affect the measurement results. The bowl lip rotation method and the nail rotation method, due to the small friction, the rotation is very flexible, but it is easy to fall, and the wisp suspension method is the most secure method.

Don't look at these methods are simple, but they embody the wisdom of the ancients, and even in later generations, water needles and dry needles were made according to this principle.

The compass in Du He's hand is used in the wisp suspension method, using wax and silk to hang in the glass ball, although the structure is simple, but it is much more accurate than Sinan.

The chief eunuch took the compass in Du He's hand to Li Shimin, and let him play with it, and the double-pointed pointer pointing to the north and south would never change.

"What a clever work!" Li Shimin couldn't have imagined that such a small thing would be more exquisite than Sinan, which has been passed down for thousands of years.

"It's just a gadget," he continued, "and the real compass needle is more detailed and precise than this. ”

The structure of the compass needle is a hundred times more complicated than the compass, and Du He can't remember the detailed steps, but fortunately, he has a general impression and the principle of the compass as a basis, and may not be so fine, but it is more than enough for navigation to identify the correct direction of the course.

There are 10 articles and 20 sub-items in Duhe's recital, each of which is in line with the actual problems of developing Jiangnan and the actual situation that may occur.

Li Shimin also asked every big and small item.

Almost every point and every Du He can give a reasonable explanation, even if there are individual deficiencies, Wei Zheng, Fang Xuanling, Du Ruhui, Chu Suiliang and other heroes of the Tang Dynasty will also come up with better ways to solve them one by one.

For a long time, Du He has not been very popular in the court, and the key is that he is too young and his foundation is too shallow. His military exploits are indeed brilliant, but in the eyes of Wenchen, no matter how high his military merits are, it is difficult to enter their eyes. Therefore, in the hearts of those old ministers, Du He was able to meddle in government affairs, it was all because of Li Shimin's partiality, Du He proposed to govern Jiangnan and develop the Maritime Silk Road, which did make some Wenchen look at him differently, but they were all stubborn as cattle, and it was not so easy to admit Du He's ability, not to mention that the original proposal was just an outline, and had no substantive significance, just like empty words, which could not be convincing.

Now the ten articles and twenty small items in his music are every word, which makes people have to be convinced.

The biggest advantage of the early Tang Dynasty was that there was no mediocre minister in the Manchu Dynasty, they may be villains, or they may have some bad intentions, but they are all capable, capable, and good ministers with hearts to the Tang Dynasty.

For the sake of the future of Datang, they all expressed their opinions without hesitation, so that the deficiencies in the Duhe recital could be improved and more perfect.

Li Shimin joined the concert, and they had just discussed the last of the 20 items, the issue of flood protection.

Jiangnan is extremely rich in water resources, and there is almost no drought, but only floods need attention.

The Yellow River and the Yangtze River are the two major rivers in China, and if the Yellow River is the mother river, then the Yangtze River can only be regarded as the Houma River, which is far less effective than the Yellow River, and there are frequent floods, of course, all of which are related to the indiscriminate destruction of vegetation.

At present, the south of the Yangtze River has not been developed, and the ecological environment on both sides of the Yangtze River has not been damaged, so Du He put forward the opinion of prevention in the recital, and the development of the south of the Yangtze River can be, but it must not be developed indiscriminately, especially the vegetation and ecological environment on both sides of the Yangtze River.

Li Shimin said with emotion: "The ten articles in the chapter of Xiao Du Aiqing, twenty small items, every word is beautiful, and the precautions for governing Jiangnan are undoubtedly revealed, and I hereby order that all the articles and items mentioned in the chapter will be followed, and in addition, I will be promoted to the right Shilang of Shangshu Province to assist Shangshu Province in handling all specific matters related to the development of Jiangnan." ”

At this moment, Li Shimin was promoted to the official of Duhe, and the Manchu Dynasty was civil and military, and no one said a word.

"Retreat!"

In order to develop the major event of Jiangnan, they have unconsciously discussed for five hours, and it has already passed the lunch time, and before they know it, this discussion is over, and everyone has a feeling of hunger.

Li Shimin also gave the order to retreat from the dynasty.

The ministers retreated, Du He spoke for almost five hours, his mouth was dry, and his stomach began to bark, and he was about to go to the side hall to drink tea and eat pastries, but the eunuch next to Li Shimin stopped him and asked him to go to the dining room.

Du He knew that there was something delicious and hurried to the dining room.

Li Shimin was already eating and drinking in the dining room, with empty dishes and chopsticks placed opposite him, and when he saw Du He coming, he asked him to sit down together.

Du He was not polite, while pouring wine into his mouth, while stuffing ham meat, no one spoke.

After filling his stomach slightly, Li Shimin pretended to ask casually: "Virtuous son-in-law, you said that Alexander the Great really has such a masterpiece, and the land he fought down really has my three Tang territories?" ”

When Du He heard this, he was happy, and he had already expected that Li Shimin would ask: To tell the truth, there was no one at all.

Although Alexander the Great is powerful, his territory spans Southeast Europe, West Asia, North Africa, Central Asia, and South Asia, but the actual territory is not as good as the period when the territory of the Tang Dynasty was victorious.

The reason why he said this is because he knows Li Shimin too well, Li Shimin is a perfect idea, he is very modest on the surface, but in fact he is very narcissistic, he wants to be the first in the world, the goal is to surpass the Qin Emperor Han Wu, with the current development trend of the Tang Dynasty, it is not far from surpassing the Qin Emperor Han Wu, and in some places the Qin Emperor Han Wu is far inferior to him.

What this person fears most is that he has no goal, especially an emperor, once the emperor has no goal, all that is left is pleasure.

Du He deliberately fabricated an unattainable character here, just to tell Li Shimin that you are still far away.

Li Shimin really got hit, and the target was no longer Emperor Qin and Han Wu, but the "Alexander" who defeated the three Tang Dynasty!