Especially in Southeast Asia, where there are many islands, which resemble primitive societies. Most people depend on the sky for food, they have almost no pursuit, and the development of science and technology is close to nothing.

Therefore, except for simple tools, products with any complex processes cannot be manufactured. And the iron pot is the product they need the most, and the demand for the iron pot is amazing, and the seemingly simple iron pot is the most demanded thing there.

Without rice bowls and cups and saucers, they could eat with leaves and branches, but without iron pots, it would be difficult for them to cook rice.

Through the export over the years and the understanding of the personnel stationed in the internal supervision area, Zhu Zhanji also had a preliminary understanding of the needs of the Nanyang countries.

In a word, as long as it is a product of the Ming Dynasty, there is no country that does not need it, it is nothing more than the price and the profit.

From the first time he went to the West ten years ago, Zhu Di was influenced by Zhu Zhanji, accepted the first compensation, and decided to develop business. In the next few times, every time they went to sea, the internal supervisor would fill the big ship with all kinds of goods, and behind the fleet, there would also be many merchant ships sent by nobles and ministers.

Compared to the original history, the current business environment is much more relaxed. However, it is still only those who have a relatively strong relationship to participate in the sea trade, and those ordinary people can only choose to sell their goods to the dignitaries and nobles in order to hope to sell the sea.

Of course, this kind of monopoly is not conducive to commercial development, but in the current Ming Dynasty, Zhu Di's ability to allow high-ranking officials and nobles other than internal supervisors to participate in maritime trade is progress in itself.

And North Korea and Dongying, which have the closest relationship with the Ming Dynasty, are also the largest trading countries of the Ming Dynasty, and they are still tightly controlled by internal supervision.

No one can do the trade between the two countries alone, and it can only be operated through the entire internal monitoring system. In recent years, the inner treasury has been abundant, mainly relying on these trade profits and tariffs.

However, Zhu Di was used to being lavish, and almost all of this money was spent by him, and it cost three million taels of silver to build a Wudang Mountain Dao Palace alone.

And that's not a big deal, because it costs more money to build the Great Wall. This time, it was because of a big victory and the discovery of copper mountains in the grassland that he decided to mobilize the people who built the Great Wall to the grassland to build roads.

For Zhu Zhanji, he agreed that the symbolism of the Great Wall was greater than its practical significance.

The long border, where can I defend it? There are only a thousand days to be a thief, how can there be a thousand days to prevent thieves!

Only by using all means to dismantle the hostile forces can we truly do it once and for all.

Therefore, this time the copper mountain was discovered on the grassland, and this huge benefit made Zhu Di and the soldiers of the army reluctant to give up, so they made up their minds to expand their power all the way to the heart of the grassland.

Of course, the more important thing is the benefit, the cost, to solve the cost problem, at this time, the Ming will not be afraid of any enemy.

Holding the statistical data, I was distracted, and there was a sound of footsteps outside. Zhu Zhanji raised his head and soon saw Li Liang rushing in with high spirits. "Your Highness, great joy. Deputy Envoy Ma, no...... It was the deputy of the horse institute who contributed a new type of telescope to His Royal Highness the Taisun, which is said to be able to reach 40 times! ”

Zhu Zhanji's heart moved, stood up, looked at Liu Wan who was following him, and said, "Take it and let me take a look." ”

Liu Wan, who was holding the box, immediately stepped forward, put the box on the low table in front of Zhu Zhanji, and then opened the box.

Looking at it at the first day, this telescope is not much different from the current telescope, but he is also well-informed, and he knows this kind of thing, but he can't just look at the appearance.

With this telescope in his hand, Zhu Zhanji looked at a big tree in the courtyard of Yongshou Palace outside the palace wall.

The telescope works well, but the lens shakes a lot.

This is normal, whether it is a refracting telescope or a reflecting telescope, the higher the magnification, the higher the requirements for stability.

An astronomical telescope like that can't be held in your hand at all, otherwise you won't be able to see anything clearly. A base needs to be installed to slowly adjust to the best viewing angle.

A tiny, imperceptible tremor is dozens of times the tremor effect for a telescope that is dozens of times greater.

Therefore, even if it is a military telescope, it is ten or twenty times at most, and no matter how high the multiple, it is not applicable.

Zhu Zhanji sat down again, and Li Liang and the others immediately retreated to the side in amusement and gave up their eyes.

Zhu Zhanji put one arm on the table as a support, then aimed at the tree and began to slowly adjust the lens.

He has been practicing martial arts for a long time, and his stability is very good, which also makes the shake of the lens not so powerful.

The camera zoomed in, he saw it clearly, and the clarity was not bad, which also made him curious about how it was made.

In his previous life, he didn't touch a telescope when he was a child, and later the barracks were equipped with various telescopes, but he didn't have the leisure to disassemble them to see what the principle was.

He just knew that convex and concave lenses could form telescopes, and convex lenses and convex lenses could also form telescopes, but he didn't understand the specific principle at all.

Although he has a reputation for inventing the telescope, the improvement of the telescope is actually experimented by the craftsmen of the Ministry of Industry little by little.

For example, the telescope he first developed was upside down, and although it could be used as a telescope, it was very laborious to see things.

Later, the craftsmen used the principle of light refraction to add a convex lens and add a refraction to solve this problem.

And now the lens not only sees more clearly, but also has no upside-down mirror, so it makes him more curious.

Putting down the binoculars, he asked, "You just said that it was made by Deputy Envoy Ma?" Didn't he just come home yesterday? ”

Li Liang said with a smile: "Although it was contributed by Deputy Ma, it was not developed by him, and the person who developed this telescope is Deputy Ma's nephew, who is one year younger than His Royal Highness!" ”

Zhu Zhanji had a hint of curiosity at this time, and said with a smile: "I guess you also understand him clearly, come back!" ”

Li Liang gave an introduction to the situation of Ma Zhicai's family, and saw that Zhu Zhanji was interested in Ma Di, and also said that Ma Di was proficient in arithmetic, although he was only fifteen years old, but this telescope was invented by him alone, and introduced it.

"They are foreign ministers and can't enter the palace, so the slave maid didn't bring them back today, and when they entered the palace and wanted to see them, the slave and maid immediately arranged it."

Zhu Zhanji nodded and said, "I'm going to go to the farm tomorrow to inspect the young army, so let their uncle and nephew see me at the farm tomorrow." ”

On the second day, Zhu Zhanji met Ma Di, who was one year younger than him, at the farm.

Fifteen-year-old Madi is handsome, and now she has no hair tied up, and she looks like a little girl. And his expression is very much like a ranger's frightened, somewhat curious little girl.

followed his uncle with a big salute, and after Zhu Zhanji sat down, he dared to raise his head and look at Zhu Zhanji secretly.

Except for the lack of a pair of glasses and a little longer hair, he is not much different from a junior high school student in later generations.

If you just look at him, it is hard to believe that he is proficient in arithmetic and can independently calculate the equation of triangular sum. In addition, the multiple of the telescope can be calculated according to the principle of refraction of light.

Especially the latter point, Zhu Zhanji can't even figure it out now.

What he remembers most is the calculation formula of the sextant and the test formula for the distance to the port of ocean navigation, because this is what he must be proficient in when he is a captain. In addition to these, he remembered a few equations at most, and forgot all the rest.

He asked in a friendly voice: "Ma Di, yesterday you told Li Shaojian that you were proficient in "Yang Hui's Algorithm" and "Arithmetic Enlightenment", is this true? ”

He immediately stood up, bowed down and said, "The little people don't dare to be bullied. After the grandfather Yu Gongnai miscellaneous family, the Yu family retreated all the way south to Fujian in the pre-Song Dynasty, but in the end, the country was ruined, and the Yu family eventually fell into the hands of the Yuan people. However, relying on ancestral arithmetic, in the pre-Yuan period, it was also possible to make a living from it. The maternal ancestor of the family was moved to Songjiang by the Yuan people in the pre-Yuan period to help them make a profit from the sea trade.

The small people of Gusu, because they had paid tribute to the Great Zhou, were sentenced to be rebellious, not allowed to take the imperial examination, the ancestors of the family had no queen, treated the small people as their own grandsons, and gave the family arithmetic, including the "Euclidean Geometry" collected by the former Yuan, to the small people. ”

proficient in mathematics, and has a family history, and can polish crystal, glass, and process carving, this family is really a talent that Zhu Zhanji urgently needs now.

Then Zhu Zhanji asked him how to improve the telescope, and when he heard that a prism should be added to the telescope, Zhu Zhanji was also a little confused, he had never dismantled the telescope before, and he didn't know that such an accessory would be added to the telescope.

If you don't understand something, you leave it to a professional person to do, and he doesn't think about it anymore. After a look, he asked Liu Wan to hand him the few equations he had copied before. "In that case, I will also test you, if I can be satisfied, it is possible to help you get rid of the guilt."

He raised his head in surprise and looked at Zhu Zhanji's eyes full of surprise. "Your Highness, Xiaomin is willing to give it a try."

Ma Zhicai wanted to remind his nephew, but he didn't dare to speak.

The so-called rebellion, the crime, in addition to not being able to conduct scientific research, in fact, not many people in the entire Suzhou Mansion cared. Because most of the people in Suzhou are guilty.

Therefore, a Suzhou Mansion bears nearly one percent of the tax burden of the entire Ming Dynasty, which is the punishment of Taizu because the Suzhou Mansion supports the Great Zhou.

He was requisitioned for nine years before he was transferred from the people to the stream and served as the deputy envoy of Congjiupin, which also has something to do with his identity. However, he has now become an official, although he is the lowest official, and this crime is actually equivalent to being abolished.

Although Ma Di is smart, he has not studied the Four Books and Five Classics since he was a child, nor has he learned the Eight Shares, and now it is too late to learn.

Now to study the Four Books and Five Classics and participate in the scientific examination, it is better to take the opportunity of the telescope to directly seek a career for Madi.

Therefore, Madi did not think clearly about the doorway, but for those who have been studying these issues all their lives and want to get out of citizenship as soon as possible, they have figured it out in an instant.

Taisun's promise may be a great favor to other families, but for the Ma family, it is at most just icing on the cake and has no practical benefits.

However, the nephew's innocence may be more satisfying to the grandson, so if you don't mention other conditions, maybe the result will be better.

(First of all, let's make it clear that although the protagonist is called Zhu Zhanji, he will never engage in that base.) Hey hey)