Just as the battles started outside the pass, the Jingji area inside the pass was still looking peaceful and stable.

In early spring, the green winter wheat gives vibrant vitality on the slightly deserted northern fields. Farmers can be seen everywhere in the fields. Farmers are weeding, watering and fertilizing their crops in order to achieve a good harvest of summer grain.

I am unwilling to be busy with the plowing spring, and my face is hungry after autumn.

Every word and sentence of the ancient proverb passed down by our ancestors reveals a deep understanding of life.

At this time, the carriage that Zhu Youjian was riding in was driving towards the military weapon prison. Wang Chengen bent down and stood in a corner of the carriage shaking constantly, not just looking at the emperor who was leaning against the soft collapse and resting.

Since receiving the news that the four-wheeled carriage has been successfully trial-produced yesterday, Zhu Youjian couldn't wait to see the true appearance of this epoch-making vehicle with his own eyes.

Although horse-drawn carriages were born in China a long time ago and soon became the main means of transportation, due to various reasons and conditions, the two-wheeled carriages that have been galloping on this vast land have always been two-wheeled carriages.

The four-wheeled carriage was not introduced into China from the West until the end of the Qing Dynasty, but before the Chinese could use it for a long time, it was quickly eliminated with the birth of the car.

Compared with four-wheeled carriages, two-wheeled carriages have several obvious shortcomings and disadvantages.

First, the load on the two-wheeled carriage is very small.

Since there are only two wheels in contact with the ground, the weight of the carriage will increase the pressure, resulting in deeper ruts on the road. Once the carriage falls into deeper ruts, it will be quite time-consuming and labor-intensive to drag the carriage out again.

Secondly, the load part of the carriage is pressed on the livestock, which increases the burden on the livestock, making it impossible for the livestock such as cattle and horses to pull the cart to pull the cart with all their strength.

Third, the vehicle is extremely unstable.

Since the height of the livestock and the wheels cannot be required to be on the same plane, the car is always inclined, causing the people and cargo in the car to be placed inclined.

When the cattle and horses pulling the cart are running, their four legs swing back and forth, and their backs are always in a state of vibration, so the carriage is forced to pay together, resulting in unstable carriages in the carriage.

Fourth, whenever you need to stop and rest during the journey, you must put something in front of you and carry the shaft so that the animals can be removed and rested.

This may be like putting more wooden frames and other support objects on the car. These rough and clumsy things will definitely take up a lot of space, which greatly reduces the number of people and loading.

The biggest problem with a two-wheeled carriage is the steering problem of the carriage.

This extraordinary difficulty has never been properly resolved in China's thousands of years of history.

After thinking about improving the two-wheeled carriage, Zhu Youjian spent his brain and thought about the knowledge he learned in later generations, and finally remembered an article he had read in a late night when he was unable to fall asleep.

This short article mentions the most critical issue of four-wheeled carriages and two-wheeled carriages: steering system.

Although the article does not provide specific physical objects and production processes, it mentions the idea of ​​solving this problem.

The first two wheels of the four-wheeler are installed on one frame, while the second two wheels are installed on the other frame. The rear frame is mounted on the front frame and is connected by a vertical shaft in the middle.

The so-called four-wheeler is actually a combination of two two-wheeler.

This is the famous four-wheeler steering problem.

The Ming Dynasty did not lack skilled craftsmen, they only lacked a kind of idea and creativity.

As long as someone expresses his ideas and ideas, these skillful craftsmen will transform your creativity into actual objects, even better than your imagination.

Just as Zhu Youjian was concentrating on his mind, the carriage stopped and the military weapon was in charge.

The Minister of Works, Fan Jingwen, and the two ministers on the left and right, Bi Maokang, who was given the title of Minister of Works, Zhang Jimeng, the disciple of Bi Maokang, who had been promoted to the Chief of Military Arts Supervision, and his two nephews, Bi Dengfu, Bi Denghan, who were obsessed with the study and unintentional imperial examinations, all stood at the gate of the Military Arts Supervision to welcome Zhu Youjian's arrival.

"I will meet the Lord!"

Fan Jingwen and others bowed and bowed.

Zhang Jimeng and others bowed their hands.

Some time ago, Zhu Youjian issued an order that unless there are major occasions such as sacrifices to the dynasty, officials above the fourth rank do not need to kneel down when they see the emperor, and they will be replaced by bowing ceremony.

This enlightened move has been unanimously praised by all senior officials.

The emperor's move was obviously respectful, and what literati most yearned for was the way ministers and emperors "stand" to discuss the truth during the Tang and Song dynasties.

"I'm not giving any gifts! Today I'm here to see the four-wheeled carriage, but I don't know if the real thing is consistent with what I want?"

Zhu Youjian, who was wearing casual clothes, waved his hand with a smile and said.

"The real thing was built a few days ago, and several craftsmen made some changes before they announced the completion! As for whether they have been seen as the master of the emperor, I don't know, but this thing is indeed a world of difference compared to the previous two-wheeled carts!"

Fan Jingwen smiled and bowed.

Since the emperor sent someone to inform the Ministry of Works of the four-wheeled carriage, Fan Jingwen attached great importance to it.

As one of the few technical senior officials in the Ming Dynasty, Fan Jingwen had a deep understanding of the importance of four-wheeled carriages. As long as the road conditions are good, the huge transportation capacity of four-wheeled carriages will allow more goods to be circulated in various parts of the Ming Dynasty.

Because Fan Jingwen knew that under the instructions of the emperor, the sharp weapon to harden the road had been made. If it were paired with a four-wheeled carriage, the main roads in the Ming Dynasty would become a busy and smooth road.

The cement firing process led by Song Yingxing has been completed and has been accepted by Zhu Youjian.

However, due to the small number of kilns, the daily output of cement is not very high now, and the two kilns can only produce about a few hundred kilograms of cement every day.

The cement that has been produced has now been stored in the warehouse and has been treated with moisture. After reaching a certain amount, it is necessary to harden the road surface from the Tongzhou Wharf of the Canal to the Beijing City as directed by Zhu Youjian, to speed up the transportation of goods from north to south and reduce transportation costs.

Now several new large kilns are being built near Mentougou. When these larger kilns are built and put into use, the cement output will be greatly improved in the future.

"Bi Qing, what kind of things are used for the vertical shaft between the front and rear frames of the four-wheeled carriage to operate?"

Zhu Youjian walked towards the military weapon supervisor with his hands on his back. Fan Jingwen and Bi Maokang were half behind, following closely, Wang Chengen fell behind, while the others followed far behind.

The group of people was surrounded by casual lieutenants with sharp weapons, and there were crossbowmen who appeared on the high wall in the distance.

Zhu Youjian was not worried that the craftsmen could not make such things that were broken like a window paper. What he was most curious about was what was replaced by the bearings inside the vertical shaft.

At present, the Ming Dynasty's lathes cannot make iron or steel balls, so what kind of materials do the craftsmen use?
Chapter completed!