Hearing the word Shi Lu, Chen Xu was a little stunned for a moment, as if he had heard of this name somewhere, and felt a little familiar, but he couldn't remember where he had heard it.

Soon a man in his thirties with a beard and a rattan hat climbed up from under the river, wearing a long linen coat and shorts, barefoot, and his face covered with sweat.

"Shi Lu, come and meet Qing Hehou!" Fang Kuan introduced the middle-aged man to Chen Xu.

The man was also full of panic, knelt directly on the ground and kowtowed to Chen Xu, and then said a series of muttering words, although he roughly understood, but it sounded extremely awkward and uncomfortable, just like the feeling of speaking Mandarin with Cantonese people, which was very tasteless.

Chen Xu was stunned for a moment, waved his hand to let Shi Lu get up, stared at him up and down, left and right, and said, "You are not from the Central Plains?" ”

"Master Hou, Shi Lu is from Yue, and Lord Zhao Qing found him from Changsha County!" Fang Kuan hurriedly explained on the side.

Chen Xu was stunned for a moment again, and then suddenly remembered something, and instantly contacted a character, and suddenly the doubts in his heart suddenly became clear, and he grabbed the man's arm excitedly and said, "It turns out that you are Shi Lu!" ”

Belch! Chen Xu's movements and excited appearance frightened Shi Lu a lot, and even Fang Kuan was startled, "Master Hou, you ...... Do you know Shi Lu? ”

"Haha, naturally I've heard of it, Shi Lu...... Well, I heard that you are proficient in water conservancy, okay, with your help, this dam seems to be fine! ”

"Hou ...... Hou Ye praised, fine ...... Shilu must ...... The dam must be repaired...... Fix! ”

Shi Lu was a little stunned by Chen Xu's praise, he was a craftsman in charge of water conservancy in Changsha County, and he had never even been to the county seat, I don't know how Hou Ye knew about him? However, he had long heard that the Marquis of Qinghe was a disciple of the Immortal Family, and he must have the ability to be a prophet of the hexagram, so Shi Lu held back his excitement and straightened his tongue and stammered in reply.

"Well, I'll give you a promotion after repairing this dam, and I'll be the chief of water in charge of the country's water conservancy projects!" Chen Xu patted Shi Lu on the shoulder, and suddenly Shi Lu was so excited that he couldn't stand on his feet.

Next, accompanied by Shi Lu and Fang Kuan, Chen Xu went down to the river to carefully inspect the dam under construction, and even climbed on the huge waterwheel to carefully inspect the riveted parts, and felt very satisfied.

"Master Hou, now that the stone is sufficient, plus the cement, it is not only more convenient than the original Sanhe soil, but also much stronger, you can rest assured, it can be completed in three or five days at most......," Fang Kuan said all the way to the side.

"The sooner the better, of course, we must also pay attention to quality and safety, after the construction is completed, at least half a month after drying and then releasing water for testing, it is important to ensure that there are no accidents this time, and, the water mill that I painted for you last time began to get it?"

"Water Mill...... The ......" Hu Kuan wiped the sweat on his forehead for a long time, and finally drooped his head and said: "Master Hou, I didn't understand the picture you drew last time, the mutual occlusion and rotation structure of the gear device you said is too complicated, and I have been busy completing the waterwheel recently, so I haven't thought much about it...... Hehe, Master Hou, since you are here today, give me a good guide in person! ”

"Let's go, let's take a look!" Chen Xu did not reprimand Hu Kuan, but planned to go to see the mill first.

The waterwheel is close to the river bank, with a diameter of 10 meters, which is about the height of a three-story house in later generations.

In the center of the waterwheel, there is a central axis with a diameter of more than ten zhang and a diameter of six feet, this thick and long giant wood is the main beam of Nanmu removed from an abandoned palace, it is very heavy, although it has been dried for hundreds of years, but it is still enough for several tons, and it took hundreds of prisoners two full days to transport this giant tree to the location of the dam, and it took hundreds of people three days to hoist it to the finished position.

With this giant wood as the main shaft, the rest of the things are easy to do, because the waterwheel Hu Kuan has built a waterwheel in the factory before the winter last year, and the installation of all parts has already been well understood, so after the beginning of spring, the old waterwheel was dismantled, and then installed on the main shaft step by step, and it was completed in almost a month, and then it was brushed several times with tung oil.

At present, the main shaft of the waterwheel sticks out of the shore at a distance of about five zhang, hanging at a height of about two meters above the ground, thick and long, looking very fierce and domineering.

A stone wall was built underneath the main shaft, and there was nothing else.

"Master Hou, you see, once the waterwheel starts, the main shaft rotates vertically, and the iron mill rotates horizontally, you said that you can drive it by gear engagement, but I can't understand the gear diagram you draw." Hu Kuan stood under the spindle and said cautiously.

"Stupid!" Chen Xu couldn't help but roll his eyes, climbed up the stone wall and stood on the main shaft to look down a few times, pinched his chin and thought for a while and said, "You arrange for someone to go to the factory to call the hemp pole and Gong Shengsheng, by the way, find a few more carpenters!" ”

"Okay, Hou Ye, wait a minute!" Hu Kuan hurriedly ordered a steward to ride a horse to the factory to find someone.

And taking advantage of this time, Chen Xu stood under the main shaft, looked left and right, looked up and down, and slowly had a rough eyebrow in his heart.

In fact, the water wheel drive is very simple, and the simplest force conversion between vertical rotation and horizontal rotation is to use gears, but Chen Xu has not seen any gear structure in Daqin after crossing over, which means that the principle of gears has not been discovered.

The principle of gear is not complicated, and this huge diameter gear does not need to be more precise, only two gears can be occlusive with each other, the fewer the number of teeth, the easier it is to achieve, because the error of gear occlusion is larger, there can also be a greater probability of fault tolerance, such as two gears with a diameter of one meter drive each other, if only four teeth are used each, then these teeth are just installed in the direction perpendicular to each other, almost no mistakes, but the fewer teeth, the longer the tooth arm, in order to ensure the success of the two gears, In this way, the force of the tooth arm will also increase, and the strength of the tooth arm will be higher, on the contrary, the more teeth are numbered, the more precise the requirements, the fault tolerance between the gears will be smaller, the force of the tooth arm will be smaller, and the rotation will be more stable, but if the design is not good, the gear teeth can not just bite together after the gear rotates, which will inevitably cause damage to the gear teeth or even cannot be driven at all.

Gears have a very important position in mechanical engineering, almost the cornerstone of modern precision industry, almost all mechanical equipment use gears, and as a set of gears is a mechanical clock, the structure inside is completely completed by the occlusion of various gears of all sizes, is the most perfect pure mechanical gear structure.

In order to get a large enough propulsion, the diameter of the large waterwheel is designed to be ten meters, although it is not known how long it takes to rotate a circle after the water test, but it is estimated that it will be more than a minute, that is to say, the central axis in front of you can only rotate a circle, and the diameter of the iron mill in the factory is only about eight feet, larger than the main shaft, if you install wooden teeth or iron teeth on the spindle in this way, the large iron mill needs more than a minute to rotate a circle, this speed is definitely not enough, although it may be labor-saving, But the speed of grinding stone is not as fast as using the bullock, it is estimated that there is not much grinding in a day, if you want to speed up the rotation speed of the iron mill, then you can only make the drive gear bigger......

Watching Chen Xu walk around, sometimes frowning, sometimes stopping to think, and then muttering in his mouth, Hu Kuan didn't dare to ask, so he could only stand next to him and not dare to make a sound.

It seems that this gear is indeed difficult, and it stumps the omnipotent little marquis.

Twenty minutes later, with the sound of horses' hooves coming from a hurry, soon Ma Gong Shengsheng and a few craftsmen with factory tags hurriedly followed the steward.

After a salute, Chen Xu called Hu Kuan and a group of people to the front of the main shaft and said: "You help me install a wooden wheel with a diameter of one zhang and six feet on this main shaft, remember to use the strongest wood, and rivet the riveting place should be riveted with angle iron and rivets, and the two sides of the wooden wheel should also be tied with iron bars, and sixty round holes with a diameter of five inches should be made evenly on the wooden wheel for embedding wooden teeth......"

A group of people didn't know what Chen Xu wanted, so they could only listen obediently, Chen Xu said a word, and everyone nodded together.

With the production process of the large waterwheel, and the wheels of the carriage are also common, it is not a problem to install a large wooden wheel with a diameter of one foot and six feet on this axle, and it is not a problem to divide and punch holes at equal distances, and the spokes of the wheels also need to be installed in this way, and all carpenters have experience.

"That's it, how long will it take to finish?"

"The factory has a lot of high-quality wood left over from the last watermill, and if you find more apprentices and helpers, it is estimated that it will take about five days!" A carpenter said.

"The riveted and reinforced angle iron and the iron bar factory with the hoop edge will soon be able to get out!" The hemp stick also nodded.

"That's good, notify me when the wooden wheel is built, and prepare a sand mold and a large amount of steel after the public loses the victory, and prepare to pour a pair of iron mills again, but after this wooden wheel is made, I have to observe the running state of the gears to determine the number and position of the gears on the iron mill!"

"Don't worry, Master Hou, I'll go back and prepare!" If the public loses, he hurriedly agreed.

"Alright, that's it for now, the dam and the wooden wheel are being built at an accelerated pace!"

These things are in a hurry, and Chen Xu can only take a step to see how to slowly make this waterwheel mill, but according to his assumption, it must be no problem.

Design a rudder-like large wooden wheel on the main shaft, install a strong wooden stick or iron rod, and increase the circumference of the wooden wheel after the diameter is enlarged by about three times, that is to say, the large waterwheel rotates a circle, it will drive the iron mill to rotate three times, then the working speed of the iron mill is three times faster, this speed is faster than using a bullock, and as long as the waterwheel is not bad, it can rotate day and night, and it is more than ten times stronger than the grinding with livestock, and it will not be tired at all, and there is no need to eat, drink and lazar and other messy problems.

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