In the absence of modern photoelectric measurement equipment, in ancient times, surveying and mapping was a very troublesome and complicated thing, which not only required a lot of manual measurements, but also needed to calculate trigonometric functions according to angles.

Therefore, in this era, surveying and mapping not only requires a large number of manual measurements, but also requires a large number of calculations. The main calculation is to calculate the distance and height according to the principle of geometric proportionality, by measuring the length of the shadow of the wooden pole and the angle of sunlight under sunlight, and by the Pythagorean theorem. To this end, Marin also had a trigonometric comparison table written detailing the values of trigonometric functions from different angles. In this way, when surveying and calculating, there is no need to be so troublesome, just look up the table.

However, this is all mapping at closer distances. If you encounter a long distance...... Marin directly gave the method of latitude and longitude measurement, as long as the latitude and longitude of the two places were measured in detail with a sextant. Then, according to the two numerical references of the equatorial circumference of 40,078 kilometers and the meridian length of 40,009 kilometers, and then according to the difference in latitude and longitude, with simple geometric calculations, and then check the table, you can get the approximate distance between the two places. Although there is an error, it is also within the tolerable range.

In addition, in addition to the need for a large number of surveyors in the military, there is also a need for a large number of surveyors in the civilian sector. For example, when building a project, it is necessary to apply a lot of surveying and mapping. Therefore, the demand for surveyors in Beihai is very large.

Therefore, in order to train surveyors, Marin simply established the School of Geology at the University of Aurich to train all-round geological talents. As for the training of surveyors, it was handed over to the surveying and mapping major of the School of Geology. However, there are two training programs for the surveying and mapping major of the School of Geology. One is to recruit college students to specialize in geological research and surveying and mapping of civil maps. Another training plan is to help the military train committee trainees. Any soldier with a good geometric foundation and a good sense of direction can be sent to the Institute of Geology for training. After the completion of the training, the surveyors will be paid according to the salary of junior officers. The living conditions and various benefits are also much better than those of ordinary soldiers......

Moreover, these surveyors do not have to go home to farm after they are discharged from the army. Because they have a skill, they will be arranged into the land management departments in various places, and they will be responsible for the measurement and verification of land, so they can be regarded as having a good iron job.

Because it is necessary to make a sand table that restores the topography and landform, those surveyors not only need to learn geometric calculation methods, but also need to learn painting methods. The most basic thing is sketching. Because, as surveyors and surveyors, when drawing maps and topographic maps in other countries, they need to use sketching methods to quickly draw down the characteristics of the local mountains and rivers to provide reference for officers to make sand tables. After all, if you want to map the terrain on the territory of another country, you need to solve it quickly. If it drags on for a long time, it will be easy to be discovered. At the same time, because there are too many mountains and rivers, if you paint slowly like an oil painting, it is easy to make mistakes.

Therefore, every surveyor is not only a master of geometry, but also needs to be good at sketching. In this era, it is definitely talented.

Dürer, the great painter recruited by Marin, happened to be the king of sketch painting. Therefore, the unlucky painter Dürer, while busy teaching Leonardo da Vinci to learn science, also needed to go to the newly established geology school as a sketch teacher to teach students how to draw sketches.

It is also hard to say, Dürer was a noble painter and a guest of many great nobles. He was not only proficient in painting, but also studied sculpture, alchemy, mathematics, mechanics, literature, anatomy, architecture, etc., and was also quite accomplished in geometry......

Marin originally arranged for him to study with Leonardo da Vinci, hoping that he could become Da Vinci's second. After all, this product was originally a low-profile version of Leonardo da Vinci, with comprehensive abilities and versatile talents. Moreover, much younger than Leonardo da Vinci, he has a lot of potential.

At the moment, this guy is leading a research team to study single-cylinder diesel engines. However, Marin felt that even if the single-cylinder diesel engine was well studied, there would not be enough diesel. Therefore, it is better to have a steam engine. It just so happens that this guy is also proficient in geometry, which is very suitable for being a geometry teacher majoring in surveying and mapping. Dürer was then appointed as a geometry teacher and sketch teacher at the Faculty of Geology, and the only teacher of surveying and mapping at the Faculty of Geology......

Dürer was not happy, after all, he was currently with his idol Leonardo da Vinci, and although he was forced to do so, he could learn a lot. But can Marin get used to him? He was only given two options - one was to take the initiative to teach at the School of Geology; Second, he was knocked unconscious and taken away, and was forced to teach at the School of Geology......

What else can Dürer say in the face of unreasonable demands? The School of Geology was also in Aurich for a long time, and he could still meet with his idols often and ask for advice.

Leonardo da Vinci was also concerned about the loss of Dürer...... Ahem, it is also dissatisfied with being the best assistant, after all, Dürer is a very smart person, and he is a rare genius in this era who can match his brain waves. With Dürer as his assistant, he only needs to start a lot of things, and Dürer can understand his meaning and do it well. After all, Dürer is known as Leonardo da Vinci in Germany, and he is very similar to Leonardo da Vinci. Both of them are painters, and their range of hobbies is about the same, so it's just the same series. The only difference is that Da Vinci's skills are more profound, and Dürer's heat is much worse, just a low-profile version of Da Vinci.

But because the two were too similar, Leonardo da Vinci also attached great importance to Dürer, and wanted to teach him what he had learned all his life and let him inherit his mantle.

However, Marin wanted to leave Dürer, and Leonardo da Vinci was helpless. Others don't know, but he knows Marin's hooligan style, and he will be knocked unconscious and taken away if he doesn't agree with him. That's how he was kidnapped from Milan to East Friesland. Therefore, he knew very well that even if he wanted to stop it, he couldn't stop Marin, the "devil", from wanting to take Dürer away.

On the day of the separation, Dürer held Leonardo da Vinci's hand tightly and choked speechlessly......

"Teacher, take care......" Dürer was full of tears, reluctant.

"In vain...... Alas...... "Leonardo da Vinci didn't say anything, because he knew that he was powerless to change what Martha hooligans decided......

Marin on the side couldn't look at it, and said dissatisfied:

"It's not that we can't meet again, they're all in the same city, and you're worried that you won't be able to see each other?"

Marin did not mention the fact that he was at the same university, because the Faculty of Geology was not located on the main campus of the University of Aurich, but on the edge of the city. For one, there is no space available on the main campus. In addition, the major of surveying and mapping is a confidential course, which requires the use of many confidential instruments such as telescopes and sextants. Therefore, it is not suitable to appear on the open main campus. As a result, the Institute of Geology was placed on the edge of the city, next to a barracks, and security was tight.

"I can't always follow the teacher and accept his old man's teachings......" Dürer said very literally.

Marin's teeth were sore when he heard this, and he waved his hand impatiently:

"Alright, don't be sour. In this way, you go to the School of Geology to teach during the day, and you can come back to Ada as an assistant after class, as long as you are not afraid of the hard work of going back and forth......"

"I'm not afraid of hardship!" Before Marin could finish speaking, Dürer took a stand.

For a science maniac, being able to learn and engage in scientific research is the happiest thing. Even, in order to study with Leonardo da Vinci, Dürer lived in a university dormitory for a long time and did not return home much.

Of course, it is also a fact that Dürer and his wife Agnès had a bad relationship. Dürer and his wife Agnès were married by their father, who came from another family of artisanal owners, and whose father-in-law and father were old friends. But the relationship between the couple is very weak, and it is not good, nor is it bad.

Originally, in history, Dürer did not return home for a long time, and his wife did not go out of the wall. Therefore, the couple had no children for life and had no children. Even, Agnès didn't like Dürer's art very much, and he didn't like Dürer's artist friends. Because, Agnès, who was born as the daughter of a handicraft owner, valued money and wealth more, and was not on the same channel as Dürer's thoughts.

But on this plane, Dürer was forcibly recruited by Marin, and Agnès followed Dürer to the North Sea Kingdom. Because of the importance of Dürer, after Dürer became Leonardo da Vinci's assistant coach, Marin directly gave a knightly title of nobility, which made Dürer's utilitarian wife Agnès very valuable. Then, the relationship between the husband and wife improved a lot, and even had children. In fact, Agnès took the initiative to push back her colder husband Dürer......

However, Dürer was, after all, an art maniac and a technocracy. Therefore, even after giving birth to a daughter with his wife, Dürer still valued the opportunity to study with Leonardo da Vinci more than his family.

Marin oppressed him so much, he was so willing. Of course, he mainly liked to study with Leonardo da Vinci rather than being a teacher at any geological college. However, if he does not go to the School of Geology, someone will come and knock him unconscious and forcibly take him to the School of Geology. Therefore, even if he is dissatisfied, he can only do so.

And Marin asked him to go to Leonardo da Vinci to work overtime and stay up late after taking classes in the School of Geology, and he didn't have any dissatisfaction, he was really a fanatical technical nerd......

"What an unfortunate boy...... Leonardo da Vinci shook his head, sympathetic to Dürer's plight. But how could he not? In the North Sea Country, Leonardo da Vinci alone is almost used by 10 people. He is a professor in the science department at the University of Aurich, and he is the only one who teaches students in the fields of mechanics, physics and chemistry. Although the first batch of graduates has graduated, those who are still following him to gain experience cannot take the lead. Therefore, he is the one who is the most tired. Dürer, on the other hand, was just beginning to follow his old path. In short, they are masters and apprentices, and they have sold their lives to Marin in this life. Fortunately, what they do is the science they already love. Although Marin desperately squeezed them, the treatment he gave was really not low. Moreover, they also learned a lot of scientific knowledge from Marin, which can be regarded as a great benefit. Otherwise, their masters and apprentices are all arrogant peerless geniuses, where are they willing to be so squeezed by Marin?