Online Games: Start as an Emperor

The compass, also known as the Sinan chariot, is a device used to indicate directions in ancient times. Unlike a compass that uses the geomagnetic effect, it does not use magnetism.

A compass is a simple mechanical device that uses gear transmission to indicate direction.

The principle is that manpower is used to drive the two-wheeled guide car to move, thereby driving the wooden gear in the car to rotate to transmit the differential of the two wheels during steering, and then drive the pointing wooden man on the car in the opposite direction to the car's steering direction. The angles are the same, so that the wooden man on the car indicates the direction. No matter which way the car turns, the hand of the wooden man always points to the direction indicated by the wooden man set when the compass car set off."Although the car is returning, the hand always guides."

There are four theories about the time when the compass appeared: 1. Ancient books such as"Gujinzhu" and"Zhilin" written by Cui Bao of the Western Jin Dynasty said that when the Yellow Emperor fought with Chi You, Chi You made a heavy fog, and Huang Di built a compass to lead the way for the soldiers. 2. Ancient books such as"Ancient and Modern Notes" and"Guiguzi" say that Duke Zhou made a guide car because the"Yue Shang clan" came to pay tribute and lost their way back. Zhou Gong built a"five-carriage" guide car to guide them. 3. In his book"History of the Invention of Mechanical Engineering (Part 1)", Liu Xianzhou said that the invention of the compass should be based on records in the ancient book"Xijing Miscellanies" and was dated to the Western Han Dynasty. 4. Wang Zhenduo said in his book"Science and Technology Archeology Forum" that"the person who created the compass must be trusted by Ma Jun from the Three Kingdoms period" and cited the records in"Wei Lue" to prove it.

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But according to Yelu Chucai's words, this compass should be a product of the Yellow Emperor's period.

Regardless can't help but look with discerning eyes.

Information about the guide car suddenly appeared.

Item name - guide car.

Level - gold level props.

Function: Break all formations and guide the direction.

In the military formation, you can look for flaws in the formation.

Can be immune to confusing military magical powers.

Source: Huangdi period, it was a treasure from the period when the emperor fought against Chi You

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After Lu Yan read this information, his originally disappointed mood was suddenly shaken.

His eyes suddenly lit up.

The guide car not only functions as a guide, but can also break formations.

This effect is really too powerful.

Especially the military formation.

This thing is absolutely awesome.

Regarding the guide car, Lu Yan also knew that many people wanted to develop a guide car.

Some people are really good and develop the compass very well.

In Lu Yan's view, the difficulty lies in the characters on the compass.

How can I get the other party to keep pointing south?

It is said that craftsmen manually adjusted the wooden fairy's hand to the south when using it.

If the horse drags the shaft and goes straight, the two small flat wheels on the left and right are suspended in the air, and the small gears of the wheels and the large flat wheel in the cart do not engage in transmission, so the wooden man does not turn, and of course it will not change its direction.

If the car turns to the left, the front end of the shaft must also turn to the left, and the rear end of the shaft must turn to the right.

This change in the shaft will cause the ropes tied to the shaft to suspend the two small flat wheels to correspondingly tighten, thereby pulling the small flat wheel on the left upward, but still making it suspended; while the small flat wheel on the right will be suspended by the iron weight and Its own weight falls, causing the meshing transmission of the wheel pinion and the large flat wheel.

If the car turns 90 degrees to the left, the left wheel will not move while the right wheel turns half a turn.

The small gear connected to the right wheel also rotates half a turn (that is, 12 teeth), and is transmitted to the large flat wheel through the small flat wheel. The big flat wheel will rotate 12 teeth in the opposite direction, that is, 1/4 of a turn (that is, 90 degree), in this way, while the wooden fairy turns 90 degrees to the left together with the car, it also turns 90 degrees to the right due to the meshing transmission of the gears. The result is that there is no rotation, so its direction remains unchanged.

The results of a car turning to the right or other motion situations can be deduced by analogy. In short, no matter how the car turns, the Wood Immortal can always keep its direction unchanged.

The compass wheel not only appeared in the Huangdi period, but also appeared in many dynasties in the later period and was even studied.

However, most of them were used as tools for the emperor's envoys. They were only used by the emperor on solemn occasions and were often indispensable in the emperor's honor guard.

《An interesting thing is also recorded in"Book of Southern Qi". After Liu Song of the Southern and Northern Dynasties conquered Guanzhong, he received a compass as a trophy, but it only had the outer shell and no internal parts.

So when the emperor traveled, he had people hiding in the car to control it. It can be seen that whether there is a guide car is related to the emperor's dignity and dignity, which is very important.

The use of compasses did not last until the Song Dynasty. According to the records in"Song History", we know that there must have been compasses in the Northern Song Dynasty. After the capital of the Song Dynasty moved south, it suffered from many wars and had no intention and inability to take care of compasses.

After the Song Dynasty, the Yuan Dynasty was established, which was ruled by ethnic minorities and did not pay attention to the past traditions of the Han people. The compass was no longer developed, and it has since disappeared.

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""I like this thing very much." Lu Yan liked the three gifts brought by Yelu Chucai very much.

Especially the Qingzhou Ding.

"As long as the emperor likes it," Yelu Chucai couldn't help but breathed a sigh of relief.

""Here are the people, let's have a banquet." Lu Yan looked at the sky and realized that it was getting late, so it was time to hold a banquet in honor of the guests from the Liao Kingdom.

"Tonight, I will not return unless I get drunk."