Xishan, the weather has been quite good in recent days, the sun is shining, sweeping away the haze of some time ago, making this cold winter day a little warmer.

"Tsk, this craftsmanship is really good, the magnification of this telescope is quite good, and the mountains in the distance can be seen clearly."

Liu Jin held a recently made monocular in his hand and carefully played with the mountains in the distance.

With colorless glass, it is relatively simple to make this telescope, and the principle of the telescope is also very simple, which is a kind of use of lenses or mirrors and other optical instruments, using the refraction of light through the lens or the reflection of light through the concave mirror to make it enter the small hole and converge for imaging, and then through a magnifying eyepiece to be seen.

Liu Jin found a few masters in the jade industry in the capital, and asked the other party to polish the colorless glass according to his own requirements, polish the concave and convex realm, and then made this monocular.

"This lens polishing is really good, I ordered it to go down, and I will be rewarded, and I will inform them to polish more lenses for me."

After playing with it for a while, Liu Jin also put down the telescope and said to the steward on the Xishan side.

"Yes~"

Although I don't understand what Liu Jin has come up with such a strange thing, he still holds it and looks at it in front of his eyes, but Liu Jin has the final say on this Xishan, and these stewards under his hands have already admired Liu Jin's five bodies.

"Ahem~Ahem~"

At that moment, there was a coughing sound outside the door, apparently on purpose, and a boy who appeared to be eleven or twelve years old walked in with a few people.

This young man has sword eyebrows and starry eyes, red lips and white teeth, and he has a good skin, and more importantly, this young man's temperament, he looks like the second in the world, like a newborn calf.

"It turned out to be Zhu Gongzi~"

As soon as Liu Jin looked at the person, he immediately smiled and said, the person who came was Zhu Houzhao, the son of Emperor Hongzhi, Ming Wuzong, of course, Zhu Houzhao at this time was still a problem teenager, not studying well, asking the teacher for sick leave every day, like to dance knives and guns, as the most admired people of the prince, Wei Qing and Huo Quai.

At this time, Zhu Houzhao was looking at Liu Jin with a smile, next to Zhu Houzhao, several family members dressed up should be the royal guards responsible for protecting Zhu Houzhao, as for the side, the face is beardless, and the appearance of a housekeeper is naturally the famous Liu Jin.

Of course, the current Liu Jin is just a little eunuch next to the prince, and he is not the head of the Eight Tigers, Liu Gonggong, who makes people look bad.

"Last time I heard a lot of things from you in Mochizuki Tower, I have a lot of questions in my stomach that I want to ask you, and I have always wanted to come out to find you, but my father disagrees."

"It's strange that when I really have the opportunity to come out to you, I don't have any questions to ask."

Zhu Hou took care of Liu Jin, and he didn't mean to be polite to Liu Jin, so he pulled over a stool and sat beside Liu Jin with a big grin, looking like I am very familiar with your old Liu.

"If Zhu Gongzi has any problems in the future, you might as well let someone write it down, so that you won't forget it when you come to me next time, as the so-called good memory is better than a bad pen, that's what I said."

Liu Jin smiled and said, and then said to the person: "Come over with a pot of good tea." ”

"Don't, don't, I don't like tea."

When Zhu Houzhao heard this, he waved his hand again and again, and then his eyes looked around in Liu Jin's yard, and he seemed to be very curious, especially when he saw some strange things in Liu Jin's yard, he couldn't sit still, so he hurriedly walked over and played with curiosity.

"What is this?"

Zhu Houzhao was holding a magnifying glass in his hand, which was polished by Liu Jin.

"This is a magnifying glass, you can use it to magnify objects, you hold it and look at the ground."

Liu Jin regretted a little that he didn't clean up his yard properly, there were a lot of miscellaneous things in this yard, most of which were made by Liu Jin himself, which was something that was not available in this era.

"Magnifying glass?"

When Zhu Houzhao heard this, he immediately came to his senses, squatted down and looked at the things on the ground with a magnifying glass, and was immediately startled, and said, "Wow~ It's getting bigger." ”

He couldn't help but touch it with his hand, and found that his hand had also become bigger, and then he put his hand in front of his eyes, looked at it carefully, and found that there was no change, so he was relieved.

"Interesting~Interesting~"

Zhu Houzhao was like a child who had obtained a new toy, playing with a magnifying glass.

"Come, I'll show you, there's something more interesting about it."

Liu Jin walked over, reached out and took the magnifying glass to his hand, then took out a piece of paper and put it on the ground, so that he pointed it in the direction of the sun's rays, and used the magnifying glass to gather the light on a point, and soon the paper was ignited.

"It's... How do you do that? ”

"Is this immortal magic or witchcraft?"

Zhu Houzhao and Liu Jin were dumbfounded, as if they saw Liu Jin performing immortal magic and demon magic.

"It's very simple, you see, this magnifying glass can bring the sunlight together, we will point it in the direction of the sunlight, and then slowly make this white bright spot smaller, and it can ignite the paper."

Looking at Zhu Houzhao and Liu Jin's expressions, Liu Jin was also very satisfied, coaxing children, don't be too simple.

Hearing Liu Jin's words, Zhu Houzhao also took back the magnifying glass again, and learned it in a good way, and soon he was also using the magnifying glass to ignite the paper, and suddenly the whole person cheered.

"Haha~ fun, fun."

Zhu Houzhao carefully played with the magnifying glass in his hand, and then began to light the paper continuously, playing happily.

"What is this?"

After playing with the magnifying glass for a while, he may have felt a little bored, and his eyes were looking around, and he soon found the telescope that Liu Jin put on the table, and immediately asked curiously.

"This telescope can see distant objects very clearly."

"Put it next to your eye and close your other eye."

Liu Jin looked at Zhu Houzhao and explained the role and use of the telescope.

Zhu Houzhao took the telescope and looked at the distant place, his eyes suddenly widened, and he quickly removed the telescope and opened his eyes wide, wanting to see the distance with his naked eyes.

Then he put the telescope in front of his eyes, and looked around very curiously again, and at the same time kept saying: "Fun~ Fun, interesting, so interesting, I can see distant objects so clearly." ”