Otaku Engineer in Great Tang Dynasty Chapter 143: Navigation weapon!

"Fourth, I wonder if the prince can know Sinan?"

The front hall of Li Mansion.

Li Zexuan looked at Li Xiaogong and asked.

"Of course I know how many of these things are in the Qintian Supervisor, what's wrong?"

Li Xiaogong replied strangely.

According to the Record of Ancient Mines, Sinan first appeared in Cishan, Hebei during the Warring States Period. It was originally used for feng shui, but there was no archaeological object. It took a long time from Sinan to the compass. At least the compass hadn't appeared in the early Tang Dynasty.

Qiu Yanhan, a Kanyu family in Shanxi during the Kaiyuan period of the Tang Dynasty, was praised by later generations of Kanyu as the founder of the earliest positive needle method among the three needles (positive needle, stitch needle and middle needle) of the Kanyu technique. This person may be the earliest magnetic needle Inventor.

In the early years of the Northern Song Dynasty, our country created another guide tool—the guide fish. It was made of a thin piece of steel and looked like a fish. It is two inches long and five minutes wide. The belly of the fish is recessed. It can float on the water like a boat. Fish made of steel sheets are not magnetic, so there is no guide. If you want it to be a guide, you must use manual magnetic transfer to make it a magnet with magnetism.

In the Northern Song Dynasty, Zeng Gongliang and others used the materials of predecessors to compile the "Wu Jing Zong Yao", which introduced the preparation method of guide fish in detail. As for the production method of the water-floating magnetic needle, it was first seen in "Mengxi Bi Tan" by Shen Kuo in the Northern Song Dynasty. The application of the compass in navigation was the earliest when Zheng He sailed to the West in the Ming Dynasty. In this era, the compass was invented, and it is estimated that no one would think of using it for navigation.

Yes, the gift Li Zexuan wants to give to these tens of thousands of teams is the compass. This thing is a navigating tool. During the Song and Yuan dynasties, the compass invented in my country spread to many countries in Europe and Asia. Ocean expeditions in modern Europe have become possible. Of course, European countries have established colonies through ocean voyages and have completely risen up, and we...

"Lord, Sinan's spoon handle can point to the south well no matter how it rotates. Through it, we can distinguish the direction in the vast sea! This way we won't get lost."

Li Xiaogong’s eyes lit up. Although he hadn’t been in the sea, he didn’t know how many water battles he had fought. He said excitedly: "Haha, you guys have so many spooky ideas. Only you can use Sinan in sailing. I can figure it out! But..."

Speaking of this, he frowned and said, "But Sinan is too large, and it might be inconvenient to put it on a boat."

Li Zexuan smiled and said: "The prince does not have to worry about this problem. The kid knows that there is something, he can also point out the direction, and he is very light and easy to carry. If the prince needs it, the kid can let the workshop make a few today and give it away. When you arrive at the palace, the prince will know at a glance."

"Is there such a fetish? Then you have to make it as soon as possible. It is not a few days before the start of the army!"

Li Xiaogong is really fortunate to have come here today, and it has been so rewarding!

Li Zexuan was about to nod his head, and suddenly remembered something: "The kid is very willing to help the prince, but the kid is still in the ban and cannot go out or go to the workshop in person. In this way, the progress is probably slower. ."

Although the ban allowed him to leave for many days, if there is something to go out, it is indeed inconvenient. For example, today’s revision of the "Datang Daily", yesterday when he thought of an idea, he had to write a letter to teach How do they change Ma Zhou, it is not convenient to talk in person.

Li Xiaogong said nonchalantly: "This is not a major event. This king will go to the palace in a while and ask your Majesty to postpone your ban. The military situation is urgent. This little matter must be accommodating."

Li Zexuan joyfully said: "Thank you, Lord!"

"It's okay, then, Xiaoxuan, do you have anything else to say about the things you need to pay attention to when you go to sea?"

"There is still a little bit more."

Li Zexuan groaned: "The prince, this time the 20,000 navy, the kid suggested that the prince should choose as many elite soldiers as possible, so that he can win the water battle and the land battle, and the weapons must be fully prepared. ."

Li Xiaogong's eyes flashed, and he said coldly: "Xiaoxuan, what do you mean...we will not only encounter water battles, but also fight with others on land?"

Li Zexuan nodded and said:

"Well, it is indeed very possible. There may be pirates on the water. As for the land... Lord, the goods you carry in the fleet this time are all valuable, those gorgeous silks and exquisite Porcelain is no different than gold to the people outside Nanyangization. It is hard to guarantee that they will not be malicious.

A little carelessness, then the 20,000 troops led by the prince will encounter those small countries, and the whole country will attack them, and the entire fleet will be embarrassed on all sides. The original intention of the fleet to go south this time is indeed for trade, but the defensive heart is indispensable. If others are the first to use force to break the rules, I think of the time, the prince does not need to be merciful, right? "

Li Xiaogong wrinkled his brows and said coldly: "Fanwai Xiaoguo, if you dare to offend my celestial power, this king will definitely draw his sword and drink blood, and raise my great Tang Tianwei!"

Li Zexuan exclaimed: "The prince is so bold! It's late, it's better for the prince and Uncle Qin to eat at the kid's house!"

Li Xiaogong said with a smile: "I heard that your kid is eating and drinking. You are quite accomplished. Then it happens that this king is at your house today, taste your food and wine, haha!"

Qin Qiong also nodded and smiled: "Haha, it should be the case, count the days, Xiaoxuan, you and Yu Xi are about to get married, the old man, as Yu Xi's foster father, has not eaten in your house yet! "

Li Zexuan said with sweat: "Ahem, it's the kid who didn't think about it!"

"Haha!"

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

The other side.

Meng Wenhao read the newspaper on the bridge pier for a while. He naturally focused on the last few passages of the newspaper. In his heart, he was really excited about the generous rewards for writing, and he also used his free time. The idea of ​​writing ~IndoMTL.com~ but he just thought about it, and immediately rejected it.

First of all, the school is already very tight and the competition is fierce. He still thinks about taking the first place in the monthly exam and getting the opportunity to take his family to the Zuixianlou for a free meal. Normally, If a family is allowed to eat and drink in Zuixianlou, at least 50 or 60 cans can be eaten. If you order drinks, it will be more expensive. This is more cost-effective than writing!

On the other hand, writing will definitely delay school, his father and his mother would definitely not allow it, nor would he allow it.

Shaking his head, dispelling this unrealistic idea, 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 Yongdafang, so muddled in the morning. Wandering all the way, unconsciously came to a place so far from home.

Meng Wenhao sighed and walked to the house.

"Don't move! Rob!"

When he reached Xuanyifang, Meng Wenhao suddenly heard a low man's voice in the lane between Xuanyifang and Feng'anfang. He was shocked, and quickly turned sideways to the corner of the wall, carefully peeking at the situation inside the lane.

I saw a big man in a gray shirt with a black cloth pulled from an unknown source on his face, holding a chilly kitchen knife in his hand, standing on the neck of an eleven or twelve-year-old girl Above, it was a scene of robbery in broad daylight.

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

I’m telling you a bad news. Tomorrow Xia Ke is going to a job fair again. Much, there are classmates around who get an offer. Xia Ke is anxious! If you don’t run, hurry up, it's gg! Tomorrow's update will be late, but it will definitely not be interrupted! Sorry!

Thank you for your luck again and again twice!

(End of this chapter)