The distance of dozens of miles is not a matter at all for these horses, but in half an hour, Cao Liang and his entourage have already arrived at the land of Cao's Grange.

They walked all the way to the embankment of Luoshui, the embankment of Luoshui is actually a relatively wide road, when he first entered the grange, Cao Liang saw at a glance that there were two keel waterwheels had been built and put into use.

Several farmers stomped hard, and the water of the Luo River was drawn out by the keel waterwheel and flowed into the farmland with a clatter.

What water means to crops is clear to every farmer, and in the era when food is basically dependent on the sky, God's sprinkled rain is a great gift to farmers.

But good years are limited after all, and a month of drought means that the crops in the fields are not harvested.

Although Luoshui has abundant water, the river is low and high, and it can not transport much water by manual transportation.

But the keel waterwheel is different, as long as there are two people keep stepping on the pedal of the waterwheel, the river water can be continuously absorbed, the efficiency is more than 100 times higher than the manual transportation, if you build a few more keel waterwheels, thousands of acres of land in Caojia Grange, can be transformed into good watering land.

Water means a good harvest, and it's no wonder that the farmers have happy smiles on their faces.

Science and technology is the primary productive force, this is not false at all, just a few keel waterwheels can change the production efficiency of the entire Caojia Grange, if the keel waterwheel is popularized to the entire territory of the Wei State, even if the field suitable for the application of keel waterwheel is only one percent, the scale of its grain production increase is also unprecedentedly huge.

Unfortunately, the inaction of those in power has limited Ma Jun's inventions and creations to certain places, which has not helped much to improve the productivity of the whole society.

Seeing the arrival of Cao Liang and others, the cattle steward of the Grange greeted him from afar, smiling, and full of praise for the keel waterwheel.

Cao Liang briefly inquired about Ma Jun's situation, and immediately rushed to the construction site.

The keel waterwheel is something that Cao Liang is handy, but what he really cares about is the construction of the counterweight catapult, he crossed to the Three Kingdoms, but not to farm, and the Sima family to dominate the world, is his task.

The construction site covers an area of four or five acres, which is slightly narrow from north to south, wide from east to west, and long and narrow. The two rows of poplars on the north and south sides have been tied with wooden planks and made into fences, and from the outside, you can't see the situation inside at all.

On the periphery of the building, the cattle steward also arranged for several strong men, armed with sticks, to patrol back and forth, and other unrelated personnel were strictly forbidden to approach the construction site.

Cao Liang is still very satisfied with the safety protection of the construction site, after all, secretly building large ordnance is not a thing that can see the light, unlike you build a few crossbows to make a few bows, and you can prevaricate that you go out hunting or use it to watch the family and nursing home.

Such a huge catapult, you say that it is used for hunting, I'm afraid the ghost will not believe it.

Cao Liang didn't want others to know that he was building a catapult, especially if he didn't want to be discovered by the Sima family, so he used the excuse of building a keel waterwheel to hide people's eyes.

Anyway, the area around the construction site is already completely closed, and it is very difficult for the spies outside to infiltrate.

Besides, there is no physical comparison between counterweight catapults at all, and even if people see these things until they are assembled and formed, they will not suspect anything.

In short, there was a keel waterwheel to provide cover, which made the construction of the catapult a lot smoother.

When you enter the construction site, you can immediately feel the hot scene, dozens of craftsmen are busy nervously, and a giant catapult with a height of three feet is already beginning to appear.

Although Cao Liang had been mentally prepared before, he was still shocked when he really saw the original appearance of this giant catapult.

No wonder the return cannon is known as a siege weapon, the giant of the catapults, the size alone is scary enough, the catapults used in the army now, the largest need more than 240 gunners to operate, and its size is less than half of the catapult in front of you.

Majestic and imposing, it is no wonder that the counterweight catapult is called the pinnacle of the era of cold weapons, although it is still only a prototype, it is already shocking.

The catapult without the catapult arm is more like a wooden triangular tower, and even the stone bud is a little inexplicable when he looks at it, and he can't understand what Cao Liang is doing to build such a thing.

Ma Jun is the most eye-catching among this pile of craftsmen, others are doing things in place in peace, but he is the only one, running around, shuttling back and forth, and it is difficult for him to be an old man in his sixties, who is walking like a fly, not losing to the young and strong guy at all.

Ma Jun described him as a little haggard, his face was pale, his beard was scattered, and he obviously didn't sleep well, but this did not affect his passion, from Ma Jun's eyes, it was the kind of extremely excited and almost crazy look, which was more excited than the kind of man who stayed outside the delivery room.

That's right, for Ma Jun, building this amazing catapult is even more important than his wife giving birth to a child.

As an inventor, the most exciting moment is the advent of his own work, Ma Jun has gathered his life's work to develop a catapult, and his dream is about to become a reality, which really makes him ecstatic.

"How...... What do you think? Ma Jun and Cao Liang stood side by side, holding their heads high, full of pride.

"Can it be done today?" Cao Liang asked.

"Of course!" Ma Jun is full of confidence.

Cao Liang glanced at him, it was rare that when he said this, he didn't stutter, Cao Liang smiled and said: "Mr. Ma is really a genius in the world, such an unprecedented instrument can be made within three days, it is really admirable." ”

Ma Jun listened to Cao Liang's praise, and did not flutter, but said very humbly: "If there is no Cao Gongzi to mention...... Mentions, old decay is poor...... In his lifetime, he may not be able to create such a ...... Such a wonderful catapult came, this catapult was born, and the son should be ...... When it is the first merit, the old decay is only ...... It can only be regarded as a foil. ”

Cao Liang said: "I don't know anything about machinery, it's just an occasional flash of inspiration, Mr. Ma is brilliant and skilled, if there is no Mr., even if there is such an idea, it may not be able to have any results." ”

This is Cao Liang's big truth, as a traverser, although Cao Liang knows more than people in this era, but it is only the surface, can you make a train if you have seen a train, can you make an airplane if you have seen an airplane, just know the principle, it is not enough, only with a mechanical expert like Ma Jun, it is possible to build a catapult.