ps: The data is very slim, the collection is very thin, and the recommendation is even more dying. Brothers from all walks of life are in urgent need of help from the world!

I don’t know which spring was invented. Master Zhou quickly used the useless steel-like substances in his mouth to create a slightly curved leaf spring about three feet, bent at both ends into holes, which is similar to what I have seen in later generations, at least in the same shape. As for the effect, we have to try it.

At present, six pieces of length are enough. They are divided into two groups, overlapping according to length. While the U-steel column has not yet become hard, they firmly fix the three leaf springs together. There is no way, the screws and nuts are too complicated. It is estimated that Master Zhou’s technology still cannot meet the requirements, and it is estimated that the entire Tang Empire does not have such talents.

Dayong volunteered to pull a cart. Master Zhou played the job of a carpenter, dismantled the wooden wheels, tried the bottom plate of the cart, and shook his head.

"Sir, this base plate is too thin and cannot stand the force of this leaf spring, and it will break. Why not replace it with an iron base plate?"

"No, if it's too heavy for iron, it's better to use iron bars to reinforce the bottom plate. It's better to strengthen the area where the stress is applied, and use wood in other places."

Master Zhou was inspired, so he asked several apprentices in the workshop to make a few iron bars first and inlaid them in the parts where springs were needed so that the wood would not be damaged.

The sky gradually darkened, and Yu'er also found this place. Seeing me burying my head to discuss the details of the leaf spring and the axle with Master Zhou, I was also very curious, silently setting the stone beside me and looking at us curiously.

There was a problem soon. The axle must be replaced with steel, otherwise it will become a weak link and problems will be prone to problems. If it has reached this point, no matter whether the manpower is enough, at most people cannot pull it. If you change it, you can just change it to a scalper to pull it and make it into a ox cart.

It seemed that there was no end to finish today, so Master Zhou was asked to carefully consider it, and Dayong was sent away and followed Yu'er back to the house.

After a day of fatigue, Yu'er was a little tired and lay slanted on the couch, reporting to me about the situation of defending the city on the village.

"Wife, you can do these things as you please. Anyway, there are only two of us at home. Just know what you know. It's hard for me to remember these numbers."

According to the current grain yield per mu, it can almost be considered a waste of land. I have roughly estimated that the maximum yield per mu is 300 kilograms per mu. So why did there be famines in ancient times? The grain yield is not high, and it depends on the weather. Moreover, crops are not able to resist diseases, pests, drought and floods. Therefore, every natural disaster, they have to reduce or even eliminate harvests. No, I have vaguely heard that this rice seems to be the best in some place, and it is in a place in the south where you can't urinate. You can only think about it, and you have to think about it when you think about it.

"The husband is the same. Everyone in this family is muttering. The head of the family doesn't look like the boss, and they are lazy. The village households can't pretend. Don't feel uncomfortable when they talk about it in the future."

"Dare you, you're against it. The village household has taken care of the master's house. What's the matter?"

"Who said no? The old Sun family in the neighboring village last year ran to the county to file a complaint and was fined for one year's rent. The head of the house was beaten with twenty sticks. The yamen was so bad that they couldn't get out of bed this year."

Yu'er looked at me with lingering fear when she thought of this, and she pursed her mouth. She would be beaten. It seems that the happy life of land rent in ancient times was probably added to the fire. It was difficult. It was also because of the need for food in war, food for disaster relief, and food for food. In short, the current society is still the lead in food, and everything else is optional. Forget it, you should still adjust your mindset. The land mainly looks like a landlord.

I picked up the account book that Yu'er placed on the table and flipped it around. I couldn't understand it. Not only were the numbers in capital, but I couldn't understand the method of accounting. You should know that later generations still reported the accounts in the financial department. I still had an impression of the book. It was different from this. My eyes turned black and I had to look at Yu'er in dementia.

My wife smiled and knew that I couldn't understand, so she picked up the account book and explained to me one by one how much harvested the land in the family was, how much it paid, and then sent it to the county. In short, I fell asleep and completely ignored it.

After making up for the financial knowledge of the Tang Dynasty at home for a few days, I could barely see the number in the account book and make obvious progress. In order to reward myself with such diligence and studious spirit, I specially took three days off, which was considered a benefit.

I called Dayong and asked, Master Zhou worked hard for three days before he made the prototype. However, seeing that the proprietress was staring at me every day, the two of them did not dare to disturb me and had to wait for me to come out.

"What, it's done, hurry up, let's go."

I was anxious. This thing is not just a board cart, but also a primary mechanical processing. The combination of wood and steel is a germination and an epoch-making product. So I hurried to Master Zhou’s blacksmith workshop.

A brand new cart in the yard is presented in front of me. The wheels are still wood, but they are new, thicker and stronger than the original one. The car panel is still wood, with a few iron bars added below, and the axle becomes iron, which should be steel, and the box plates are still the same. The overall size is about half a foot higher than before, which is the curve of the spring.

Without waiting for Master Zhou's introduction, I pulled it up and tried it out. It was a bit heavy, but it was still slippery, better than I thought.

"Come on, Dayong, come and pull me, I'll sit on it and try it."

Since it is a spring, you must try whether the spring works. Jumping into the car, it’s good. You can feel a slumber force coming from below, and the spring works.

Dayong pulled me around the yard for a few times. It didn't seem very heavy, and it was within the range of human resources. Although I didn't feel very comfortable sitting on the box, I obviously felt waves under my butt, and the bumps were very weak, and the comfort was successful.

Let’s look at the load capacity. Master Zhou has time to interrupt at this time

"Sir, this kind of cart has never been heard of before, and I have never seen it. I have been a blacksmith for so many years. I never thought that such a few simple steel plates could transform the cart. Sir, a talented man, is such a god."

In short, ancient people thought about everything they didn’t understand, and I couldn’t change this idea, so I simply smiled, which was a reward for Mr. Zhou’s flattery.

"Master Zhou, have you tried how much weight it can be loaded?"

"Not yet, just wait for the Lord to come over, disciples, come and put things on."

Master Zhou instructed the apprentices in the workshop to move out all the iron tools in the workshop and carefully load them onto the cart.

Two legs were made on the front handrail of the cart. After the person put it down, he could form a plane with the wheels behind him, which would not slip or slip.

Yes, looking at the truck full of iron tools and looking at the leaf springs, it basically had no curvature. Seeing that Master Zhou didn't dare to put things up, I told him to install it again. Even if it was crushed, I wouldn't be afraid, just to see where the limit was.

It was almost done. I took a look and found that it would be difficult to install whether it was a horse or a scalper to pull it up. The cart had not been crushed yet, but the wheels were a little unbearable and made some unpleasant sounds.

Okay, Master Zhou will no longer add it, and the limit is too high, and the leaf spring will also become bent in the opposite direction. It is estimated that if the wheels or springs are installed, it will be damaged. Then Master Zhou will remove some of it, so that the spring will return to a slightly curved look. Take down all the iron tools on the car to weigh it, and it will be a full 1,000 kilograms. I am happy to catch the Changan small truck. I took this thing to Nanshan to load coal. The annual output is only 100 trucks, and the round-trip freight is also saved.

Dayong was so happy that he couldn't even close his mouth and kept flattering me. In Dayong's mouth, I had long surpassed the level of the great god and continued to extend towards God, just like the Big Bang of the Universe.

"Dayong, rub, saliva, yes, there's still around your neck."

Appropriate arrogance is our goal, but we must basically follow a low-key and pragmatic style. The big tree attracts the wind, and my mother taught me this way.

A gust of autumn wind blew over, and all the mess in my mind was blown away. Mom and Dad, are you okay? Thinking of this, I lost all my mood. After sending Dayong, I came to the pool of water alone, staring at a pool of spring water, and stayed stupidly.
Chapter completed!