"Fourth, I don't know if the prince can know Sinan?"

The vestibule of the Lee House.

Li Zexuan looked at Li Xiaogong and asked.

"Of course I know, how many of these things are in Qin Tianjian, what's wrong?"

Li Xiaogong replied strangely.

According to the records of the "Ancient Mine Record", Sinan first appeared in the area of Cishan in Hebei during the Warring States Period, and was originally used for Kanyu Feng Shui, but there is no archaeological object. From Sinan to the compass, it has been a long time in the middle, at least the compass has not appeared in the early Tang Dynasty.

Qiu Yanhan, a Shanxi Kanyu scholar in the Tang Kaiyuan period, was respected by later generations as the founder of the earliest positive needle method in the three needles (positive needle, sewing needle and middle needle) of Kanyu technique, and this person may be the earliest inventor of magnetic needle.

In the early years of the Northern Song Dynasty, China created a guide tool - the guide fish, which was made of a thin steel sheet and shaped like a fish. It is two inches long and five minutes wide, and the belly of the fish is somewhat concave, and it can float on the surface of the water like a small boat. Fish made of steel sheets are not magnetic, so they do not have the role of a guide. If you want it to guide, you must also use the method of artificial magnetic transfer to make it a magnet and have magnetism.

Zeng Gongliang and others of the Northern Song Dynasty compiled the "General Essentials of the Wujing" using the data of their predecessors, which introduced in detail the preparation method of guide fish. As for the production method of the water floating magnetic needle, it was first seen in Shen Kuo's "Dream Creek Writings" in the Northern Song Dynasty. The application of the compass in navigation was first in the Ming Dynasty when Zheng He went to the West, and in this era, the compass was invented, and it is estimated that no one would think of using it for navigation.

That's right, the gift that Li Zexuan wants to give to these tens of thousands of teams is the compass, this thing is a nautical weapon, in the Song and Yuan dynasties, the compass invented by our country has spread to many countries in Europe and Asia, making it possible to explore the oceans in modern Europe.......

"Lord Wang, no matter how Sinan's spoon handle rotates, it can point well to the south, and through it, we will be able to discern the direction on the vast sea! That way you won't get lost. ”

Li Xiaogong's eyes lit up, although he had never been to the sea, but he didn't know how many water fights he had fought, he said excitedly: "Haha, you kid has a lot of ghost ideas, use Sinan for navigation, only you can think of it!" But ........"

Speaking of this, he frowned and said, "But Sinan is too large, and I am afraid it will be inconvenient to place it on the ship." ”

Li Zexuan said with a smile: "The prince doesn't have to worry about this problem, the kid knows that there is a thing, and he can also point the way, and it is extremely light and easy to carry." If the prince needs it, the kid can ask the workshop to make a few today and send them to the palace, and the prince will know when the time comes. ”

"Is there such a thing? Then you have to do it as soon as possible, and there are only a few days left before the army starts! ”

Li Xiaogong is really glad that he came here today, and the harvest is too great!

Li Zexuan was about to nod, when he suddenly remembered something and said: "The kid is very willing to help the prince, but recently the kid is still in the lockdown period, and he can't go out, and he can't go to the workshop in person, so I'm afraid the progress will be much slower." ”

Although the lockdown order allowed him to take many days off, if he needed to go out for something, it would be inconvenient, such as the revision of today's "Datang Daily", when he thought of the idea yesterday, he had to take the trouble to write a letter to teach Ma Zhou how to change it, how could it be convenient to say it in person.

Li Xiaogong said nonchalantly: "This is not a big deal, this king will go to the palace in a while and ask His Majesty to suspend your grounding order, the military situation is urgent, this little matter must be accommodating Your Majesty." ”

Li Zexuan said happily: "Thank you, Lord Wang!" ”

"It's okay, so about the aspects that need to be paid attention to when going to sea, Xiaoxuan, do you have anything else to say?"

"There's one more point."

Li Zexuan muttered: "Lord Wang, this time there are 20,000 sailors, the kid suggests that Lord Wang Ye choose as many elite soldiers as possible, so that he can win both water battles and land battles, and his weapons must also be fully prepared." ”

Li Xiaogong's eyes flashed, and he said coldly: "Xiao Xuan, what do you mean..... Not only will we have to fight in water, but also on land? ”

Li Zexuan nodded and said:

"Well, it's very likely. It's possible to encounter pirates on the water, but on land... Lord Wang, the goods carried by your fleet this time are of great value, and those gorgeous silks and exquisite porcelain are no less precious than gold to the people outside the South Seas, and it is difficult to guarantee that they will not have bad intentions.

If you are not careful, the 20,000 troops led by the prince will be attacked by those small countries with all their strength, and the entire fleet will also fall into a situation where they are besieged on all sides. The original intention of the fleet to go south this time is indeed for trade, but the heart of guarding against people is indispensable, if others take the lead in vainly trying to break the rules by force, I think when the time comes, the prince will not need to show mercy to his subordinates, right? ”

Li Xiaogong frowned, and said coldly: "Fanwai small country, if you dare to offend the tiger power of my Heavenly Empire, this king will definitely draw his sword and drink blood, and raise my Tang Tianwei!" ”

Li Zexuan exclaimed: "The prince is so courageous! It's not early, why don't you have dinner at the boy's house! ”

Li Xiaogong said with a smile: "I have heard that your kid is eating and drinking, and he is quite accomplished, so it just so happens that this king is in your house today, taste your family's food and wine, haha!" ”

Qin Qiong also nodded and smiled: "Haha, it should be like this, count the days, Xiao Xuan, you and Yu Xi are about to get married, the old man, as Yu Xi's father-in-law, has not eaten at your house yet!" ”

Li Zexuan Khan said: "Ahem, it's the kid who didn't think it through!" ”

"Haha!"

..................

The other side.

Meng Wenhao read the newspaper on the bridge pier for a while, he naturally focused on the last few paragraphs of the newspaper a few times, he was really very excited about the rich remuneration for writing, and he also had the idea of writing in his spare time, but he just thought about it, and immediately vetoed it.

First of all, the study of the arithmetic hall is already very tense, and the competition is also very fierce, he also wants to be the first in the monthly exam, and get the opportunity to take his family to the drunken fairy building for a free meal, under normal circumstances, if the family lets go of eating and drinking in the drunken fairy building, at least fifty or sixty times, if you order a drink, it will be more expensive, this is more cost-effective than writing!

On the other hand, writing will definitely delay his studies, and his father and mother will definitely not allow it, and he himself will not allow it.

Shaking his head, dispelling this unrealistic thought, Meng Wenhao looked at the sun above his head, and then got up to go home for lunch, only then did he realize that he was near Yongda Fang, wandering all the way in the morning, and unconsciously came to a place so far away from home.

Meng Wenhao sighed and walked home.

"Don't move! Rob! ”

When he walked to Xuanyi Fang, Meng Wenhao suddenly heard a deep man's voice in the alley between Xuanyi Fang and Feng'an Fang. He was shocked, and hurriedly turned sideways to the corner of the road, cautiously peeking at the situation in the alley.

I saw a big man in gray clothes, his face covered with a black cloth pulled from nowhere, holding a cold kitchen knife in his hand, which was on the neck of an eleven or twelve-year-old girl.

.........................

I'll tell you a bad news, tomorrow the knight is going to run the job fair again, the wooden way, there are classmates around me who have got an offer, and the knight is anxious! If you don't run diligently, you're going to GG! Tomorrow's update will be late, but it will certainly not be interrupted! Sorry!

Thank you for the fate of luck and another two tips!

(End of chapter)