"What is this?" Fu Xuechen asked in surprise.

""The Legend of the Western Regions" and "Maritime Observations" were all found from my father's study." Fu Yuchen reported the title of the book, and said with some admiration: "You once told me to read more miscellaneous books, and now it seems that you are right!" Miscellaneous books contain a lot of knowledge that is not found in the Four Books and the Five Classics, no wonder you know so many things. ”

Because Fu Yuchen had already spread out the pages of the book in advance, Fu Xuechen easily saw the relevant paragraphs of text that Fu Yuchen pointed out to her in the two books, and she was shocked at this time.

The author of "The Legend of the Western Regions" was a foreign merchant who was proficient in the official language of China, and his ancestral home was Navarre, because Navarre was annexed by the Western Regions Commonwealth (the predecessor of the Spanish Empire) and fled all the way to northern India, thus starting his spice business between northern India and China.

This foreign businessman likes to write travelogues, and he has written down in detail the ups and downs of his life, as well as the customs and customs of the places he has visited.

In one passage, he writes about a Dutch spectacle merchant who created a new type of spectacle that could see in the distance, and that the two mirrors could be superimposed to help people sitting in theater seats away from the stage to see the performance on stage.

The author of the book felt that this glasses business could be done, so he contacted the Dutch businessman to discuss cooperation, but unfortunately because the new glasses were expensive, and his lack of funds was rejected.

The author of "Maritime Observations" is a Chinese, a private captain of the Ningzhou maritime merchants, who has been running with the ship to the South Seas all the year round to assist his master in the maritime trade business, and his essays are full of records of various experiences on the sea, including the thrilling experience of the imperial merchant ships encountering pirates and fighting with pirates, and winning by luck.

The captain was very envious of a kind of Western pirate that appeared in the South Seas, with red hair and green eyes, and an ugly appearance, but they had a tool that could be observed from a distance, a metal monocular, one large and one small.

With the help of such a tool, they can judge the passage of merchant ships from a very long distance, and whether the forces on their side can eat them.

Last time, if it weren't for the ships of the Darong Empire passing by in the process of the battle, drawing their swords to help, they would have been planted, and it was really a very good luck to be able to escape the attack of pirates.

The captain had heard the name of the tool from other merchants in the Western Regions, called the monocular, which came from the Spanish Empire, and the number was very scarce, and he also wanted to have such a tool, but unfortunately he didn't know where to get it.

Fu Xuechen looked at the records in the book in a daze, she didn't know that there were still such books in her study, and the monocular had indeed appeared, just in the Spanish Empire, and with the emergence of pirates, it seemed that the Age of Exploration over there had begun.

What is touching is that unlike the Ming and Qing dynasties in the previous life, the Darong Empire in this time and space is not forbidden to the sea, but it is somewhat similar to the practice of the Song Dynasty in the previous life, and the empire has a quite supportive attitude towards maritime trade, because the commercial tax of the Darong Empire is quite heavy, and the treasury can collect a huge amount of commercial tax from the maritime merchants every year through the city shipping department.

Fu Yuchen admired, but still a little puzzled: "I can find the relevant text, that's all, how did you build binoculars based on such a little bit of information?" Or do you have other miscellaneous books that are more detailed? ”

If you want to deduce the manufacturing principle of a telescope from such a written record, it is naturally difficult to ascend to the sky, but Fu Xuechen is different, she first created something, and then deduced the reason from the result, which became extremely easy.

So Fu Yuchen's question was answered very easily, Fu Xuechen smiled and said: "No, I don't have any other relevant information, it's a coincidence, I just saw a sentence mentioned in the transcript, saying that this new type of glasses that can look far away uses the method of superimposing double glasses......"

"Then our Darong Empire also has a magnifying glass that can magnify words! I tried to stack two magnifying glasses on top of each other to look at something in the distance, and I just tossed the telescope out. ”

Magnifying glass is an item that has been inherited for thousands of years in China, although it is not popular, but it is not a very rare thing in the upper class, and the old and dizzy readers like to take a magnifying glass to assist in reading the text, but this magnifying glass is made of crystal, not glass.

Fu Xuechen's newly built telescope uses the Kepler telescope principle, in which two-sided convex lenses can first obtain an inverted virtual image and then an upright real image.

This thing is not very difficult for later generations of junior high school students who have learned physics and know the principles, and they can DIY it themselves if they have tools at hand, and they can remember the calculation formula, which is not very difficult, but it is a very ordinary knowledge for later science students, and it is particularly magical when it is placed in the era when science is almost desert.

Fu Xuechen answered Fu Yuchen's question on the one hand, but she was secretly happy, she was worried that it was a little difficult for her to build a telescope, and others would find it to the bottom of it! The books and materials that Fu Yuchen found just filled her lack, so that her telescope manufacturing was traceable, and it was not obtained out of thin air for no reason.

"You are very conscientious to the six princes, and it is not enough to give a small gift, but you dare to give him any idea." Fu Yuchen suddenly said something like this.

Fu Xuechen pouted and said, "Aren't I taking precautions!" Sooner or later, the two of us will have to exchange identities, and everyone else is okay to say, including the emperor, I deliberately kept my distance, so as not to be noticed in the future that we have exchanged identities. But the six princes are different, we may not be able to deceive him in the past, only by currying favor with him a lot, can we get his help in the future, and cooperate with us to completely ignore the past in this matter. ”

At the beginning, the Xie family and the Marquis of Jingbei let the two brothers and sisters exchange identities for three months, and what they thought about was not to leave a handle, as long as there was no evidence, they were not caught, especially not detected by the emperor, even if others were suspicious, they could not accuse the Fu family of a crime of bullying the king.

Fu Xuechen wants to think more, although the two brothers and sisters have similar facial features, and because they are still young, there is almost no difference between tall, short, fat and thin, supplemented by the imitation makeup methods she brought from later generations, which are almost disguise-like, they can basically be exactly the same in appearance, but their personalities and temperaments are still different after all, and people who are not familiar with them can't tell the difference, but the six princes who often accompany them can detect the difference between the two.

When the two of them changed each other's identities, it was one thing for the six princes to find no evidence of the two swapping identities, and it was another thing to know that the two had swapped identities.