Han Qian went to the countryside to see the process of well exploration, and went down to the well in person, and saw the soil profile under the well, and was already satisfied. In the process of going down the well, a lot of embarrassing things happened, which made her feel that it was difficult to get along with Su Hao calmly anymore, and hiding back in the county was her best choice.

The two workers ran away with their wheels in their hands, and they knew that they had seen something they shouldn't have seen and had to slip away as soon as possible. Before they left, Su Hao whispered a few words of advice to them, or a few words of threat, telling them that if today's incident got out, then no matter how far they escaped, he would send officials to arrest them. At that time, imprisonment is already a luxury, and the biggest possibility is to throw them directly into the waste well and evaporate from the world.

After sending away the small worker, Su Hao accompanied Han Qian's master and servant and walked slowly towards the entrance of the village. Han Qian didn't want to speak, and Su Hao couldn't be cheeky enough to talk to her, so everyone walked in silence.

When I came to the entrance of the village, Han Qian's coachman was already waiting there. At the time of the meeting just now, he had already sent Cheng Yi and Cheng Dong to the county seat, and found a temporary place for them to settle down. The next step is to wait for Han Qian to return to the county, and then find a job for Cheng Yi and contact Cheng Dong to study in the academy. These things were originally taken over by Su Hao, but they were all handed over to Han Qian, and Han Qian didn't feel wronged at all.

"Brother Su, I'm leaving, you can be more careful." When Han Qian got into the carriage, she reluctantly said to Su Hao.

"Brother Han, when you go back, please report to the magistrate, and say that I will live up to the high expectations of the adults." Su Hao said with a serious face.

"Okay......" Han Qian felt a little disappointed, but she couldn't tell what was wrong with Su Hao.

The wheels rolled and took away Han Qian and the red lotus master and servant. Han Qian sat in the carriage, her heart was in turmoil. In front of her eyes, Su Hao's confident face and slender fingers appeared from time to time. Compared with the sissy sons and young masters she had seen before, Su Hao had less wealth and nobility, but more manly pride.

"This is called a great man......" Han Qian couldn't help but muttered softly.

"Miss, what did you say?" Honglian, who was sitting on the side, asked strangely.

"I didn't say anything." Han Qian categorically denied it.

Honglian turned her head, stared at Han Qian's face seriously, and said, "Miss, why is your face so red......"

"Dead girl! Looking for a fight! Han Qian picked up her small pink fist and gently smashed it on Honglian's body a few times.

"Help! Miss is going to kill someone......" Honglian shouted quietly, teasing Han Qian. She was bought by the Han family as a maid ring since she was a child, nominally serving Han Qian, but in fact she was Han Qian's playmate, so she spoke without hindrance.

Han Qian pinched a piece of meat on Red Lotus's arm with her hand, and threatened in a low voice: "Red Lotus, I warn you, after you go back, you are not allowed to tell my father and mother about today's incident, or else......"

"Don't dare, but, miss, do you really want to choose Su Gongzi as your uncle?" Red Lotus asked.

"Who scarces him!" Han Qian said hatefully, but anyone could hear it, and her words had a taste of insincerity.

Su Hao sent Han Qian away and began to bust himself with his own affairs. Dyche had already sent someone to bring his custom-made measuring instruments, and he called the students back and began to explain to everyone the methods of field engineering surveying, including how to measure angles, how to measure distances, and how to mark.

There are many tools used in modern engineering surveying, including gyro-theodolite, dual-frequency laser interferometer, electronic level, etc., and no matter how complex, there are also measurements with the help of GPS. For these things, Su Hao didn't dare to think about them at all, he could only design some of the most basic measuring tools because of the ugliness. Luckily, the work he wants to do doesn't require too much precision, and these tools are enough to get the job done.

Now in front of the students, there is a simple engineering theodolite designed by Su Hao, which includes four parts: tripod, plate, collimator and horizontal dial. The collimator was supposed to be an optical device, but where did Su Hao find the telescope? Helpless, it can only be designed as a ruler and crosshair on the gun, which is still enough when you don't need to measure targets at too long distances.

Xie Sizhi and Jiang Youbao, the two servants of the workshop, can indeed be called good craftsmen, and the equipment made in a hurry is also very exquisite. On the horizontal dial, Su Hao asked them to divide the circumference into 360 scales, and these two people actually did it, Su Hao thought that if he didn't have a protractor, he might be difficult to do this.

It is unrealistic to explain the principle of triangulation to students in a short period of time. Su Hao gave up this effort, he just told the students how to use these tools, and then followed a fixed procedure to calculate angles, distances and other values. Even so, among the dozen or so students, only a few people such as Ma Yu understood. After the basic skills were taught, Su Hao instructed the students to work in groups of several people to go to the measurement practice. Practice makes perfect, Su Hao believes that after everyone has tried for a while, these methods will be able to be fully mastered.

Looking at the clumsy appearance of the students, Su Hao sighed secretly. As a geology expert, he knows that in fact, as early as the Song Dynasty, China's surveying technology has reached a very high level, for example, Shen Kuo once presided over the level measurement within a distance of 840 miles, and measured the horizontal height difference between Kaifeng and Luzhou is 19 zhang 4 feet 8 inches 6 minutes, accurate to the centimeter level. In the Yuan Dynasty, Guo Shoujing organized the latitude measurement of the whole country, and the measurement point in the South China Sea was the Huangyan Island in later generations. At that time, the inhabitants of a certain country were still in a state of prehistoric civilization.

It is a pity that these geodetic surveys, in the eyes of the reader, are regarded as the work of craftsmen, and cannot be climbed to the hall of elegance. In this way, most readers have no concept of this knowledge at all, if it weren't for Su Hao dragging them out to do measurements, they would never have thought that they could still do such a thing.

In order to calculate the actual angle and distance based on the measurement results, in addition to the conventional addition, subtraction, multiplication and division, there is another tool that is very important, and that is the trigonometric function table. Su Hao is not a genius, and he does not have the skills to write a trigonometric function table silently, so he can only use empirical methods to find a large empty field, draw triangles with a side length of seventy or eighty feet at various angles, and then use a tape measure to measure it, and then calculate the trigonometric functions by hand. The group of workshop officials he brought ran around according to his instructions, one by one they were tired and out of breath, but a Ming Dynasty version of the trigonometric function table really made Su Hao toss it out.

Su Hao and his entourage stayed in Caijia Village for two days, and the well location they selected finally reached the specified depth. Heaven didn't joke with Su Hao, this well location was as Su Hao expected, bubbling out of a clear spring, which was about 200 taels per hour.

Seeing the success of drilling the well, the students' admiration for Su Hao reached its peak. Especially Ma Yu, a student, follows Su Hao every day, and almost every word Su Hao says, he has to take notes and write it down, and then go back to ponder it carefully. Previously, no matter how much scientific knowledge Su Hao talked about, it was all in the air after all, and it could not be verified. Now, according to the method pointed out by Su Hao, they have really found the correct well location in Caijia Village, who dares to doubt Su Hao's talent?

The first battle was successful, and the dozen or so students brought out by Su Hao also initially mastered some skills in surveying the direction of groundwater. Su Hao divided his subordinates into 4 groups, with 4-5 students in each group, plus 2 officials from the workshop, and then asked them to go to various townships to guide the selection of well locations.

Su Hao asked each group to conduct a field survey like in Caijia Village, draw a simple map of the local area, and mark the direction of the landscape, rock types, and so on. For those places where the well has been drilled but no water has been produced, the students must also go down to the well to observe the distribution of soil and rock formations, and also record it.

After completing these tasks, the accompanying officials were responsible for sending the information to Su Hao on a fast horse, so that Su Hao could judge the local hydrological conditions, and then send them back to the original place as the basis for selecting the location of the well.

This arrangement is equivalent to treating the students as Su Hao's eyes, Su Hao does not have to personally survey each village, but only needs to judge the well location according to the geological data submitted by the students. This method of paper work is certainly not as accurate as Su Hao's on-site survey, but it can greatly improve efficiency. Previously, the average result of drilling wells in the county was that one out of every four wells could produce water, and with this method, even if the rate of abandoned wells could be reduced to less than 50%, Su Hao's credit was big enough.

One by one, the students were in high spirits and rode to various townships in carriages. Su Hao himself also brought a team and went all the way to the south, surveying along the way. Due to the limitations of the equipment, he naturally can't do it 100% correctly, but among the three wells, at least two of them can produce water, which can be said to be the difference between heaven and earth compared with the previous well drilling results.

Accepting the lesson of Caijia Village, Su Hao asked Chen Guanyu to inquire about the people in the village before surveying the wells in each village, so as to avoid hurting the vulnerable groups in the village and bringing regrets because of the wells.

Along the way, Chen Guanyu accepted the "hard-earned money" presented by the mayors of various villages for Su Hao, and unconsciously received as much as thirty or forty taels, Su Hao very generously asked Chen Guanyu to extract one-tenth of it as a commission, which made Chen Guanyu suddenly feel that he was following the right person and was more motivated to work.

On this day, Su Hao took Chen Guanyu and several subordinates to Guangfeng Township, which is located in the southeast of the county, which was known as Dushi Town in later generations.