Chapter Ninety-Six: The Telescope

The door closes the doors of the front and back rooms, and through the carved hole in the middle of the door, the cotton thread is straightened and tightened. Xu Qing read to the bamboo tube:

"Under the bridge in front of the door, swim past a flock of ducks, come and count them, two, four, six, seven eight."

After Xu Qing finished speaking, he continued to say to the bamboo tube: "Xu Qi, do you hear it, if you hear it, you can say a word in the bamboo tube." Saying that, Xu Qing's ears sounded against the bamboo tube, for a long time, maybe Xu Qi was stunned, and then returned to Xu Qing. I only heard a faint, but clear voice from the bamboo tube, Xu Qi whispered on the side of the bamboo tube: "I heard ......"

Xu Qing suddenly smiled, glanced at the four girls with suspicious faces, and said to the bamboo tube: "Then come over and tell Xue'er what you heard." ”

I only heard a creak outside the door, followed by footsteps, Xu Qi pushed the door in, and said in surprise: "Really!" I really heard it! ”

"Under the bridge in front of the door, a flock of ducks swim by, come and count them, two, four, six, seven eight!"

Xu Qi said excitedly and laughed.

Huang Shimei took the bamboo tube in Xu Qing's hand and looked at it and said, "No, you two may be colluding, this time I will speak, Xu Qi, will you listen?" ”

Xu Qi shook his head and said, "Why don't I go and talk to the other side, and you guys listen to them one by one?" So you will believe......"

Xu Qi ran over again, arranged the bamboo tube as before, straightened the cotton thread, and Huang Shimei also sounded against the bamboo tube. The other three girls also leaned over and wanted to hear it.

Before Luo Xiuxiu could get over, she was hugged by Xu Qing, this little girl, since she was broken that day, she has been a little estranged from Xu Qing. Unless Xu Qing takes the initiative to ask for it, she will never ask for a kiss or hug. Xu Qing almost thought that she was being shared that day. Mian was frightened, after all, Xu Qing had no mercy on Xue'er and Xiaoyue, and that scene was indeed a bit crazy. Later, Xu Qing figured out that Luo Xiuxiu was just cold in that aspect, of course, this did not delay Xu Qing's enthusiasm, but enhanced Xu Qing's desire to conquer.

Luo Xiuxiu sat on Xu Qing's lap, leaned on Xu Qing's arms, and only smiled and did not speak.

Behind the door, all the women were surprised and delighted, and they talked to Xu Qi one by one with bamboo tubes. Xu Qing had enough tofu, let go of Luo Xiuxiu, stood up and said, "How is it, my tailwind ears are not bad, right?" ”

Huang Shimei was convinced, and said coquettishly with a smile: "Giggles, Brother Xu, my Brother Xu is the most powerful......"

Xiao Yue also nodded and said, "Mmmmmmmmmm ”

Luo Xiuxiu also went over to listen to it, and sure enough, she heard it, but she just said: "Xu Qing, this thing is good, but you can't hear it from a distance, right?" ”

Xu Qing was actually very satisfied with this result, fortunately, the surroundings were relatively quiet, otherwise this cotton thread would not be able to conduct such a long distance of sound waves.

He nodded and said, "If you replace that cotton thread with a string, the effect will be better and spread farther." However, if you really want to spread the sound for ten miles, you still need to borrow something from the sky. ”

All the women asked in unison, "What is it?" ”

Xu Qing smiled and said, "Electric ......"

There was a time when Xu Qing really wanted to make electricity, but when he thought about it, it was useless to make electricity, at least it was useless without him now. But the women's faces turned cold, and they hurriedly said: "No, you are not allowed to do it!" ”

Xu Qing was puzzled: "What's the matter, don't you want it?" ”

All the women said in unison: "That's electricity, it will kill people, what do you want that thing for?" ”

Xu Qing laughed, it turned out that the women thought that what he said about borrowing electricity was borrowing thunder from the sky. Looking at the stupid, but serious expressions of the women, should Xu Qing be moved or moved?

Xu Qi quietly put away the "Shunfeng ear" made of the bamboo tube......

Everyone sat down, went to the meal again, and ate together, Xu Qing asked Old Man Ni Bai to invite the carver to the study.

When asked, the carver said that he could carve medicinal jade, but the ellipse had not been carved. Xu Qing took out a new piece and drew the arc, but the carver still said that he was not sure, saying that the medicine jade was too brittle, and it was all broken when he took the knife. Saying that, he gave Xu Qing a way, and after saying that, Xu Qing went to invite someone who could make medicinal jade, and directly made a piece of it.

Xu Qing asked him if he could find it, and the carver said that he couldn't find it either. Helplessly, Xu Qing took out the polished one and asked him if he would polish it.

This time, Xu Qing got a satisfactory answer, and the carver said that he would polish. He also said that if the polishing Xu Qing had polished it in his hand, he would have a great grasp. It's just that you also need to make a temporary polishing machine. Xu Qing clapped his hands, isn't there a carpenter at home, and called the carpenter over.

The carpenter and carver made do, and that afternoon, a simple polishing machine came out. It's with manpower. The large wheel is equipped with a small wheel, and the small wheel is equipped with a cloth with large friction, and the unevenness of the glass surface can be removed by continuous polishing.

There were also some small corners that protruded, and Xu Qing brought a whetstone to rub them finely. Five quilts were brought and spread on the ground, and the development of the first convex lens in history began that night.

With Xu Qing accompanied, the carver also raised his spirit and processed overnight.

In less than three watches, the convex lens is formed. After making the convex lens, Xu Qing handed over the medicinal stone materials he bought from Luonan County to the carver, and saw that he took it to practice, whatever he wanted, as long as it could be processed into what it is today, one or two pieces of silver!

The light transmittance of the few pieces of jade in Xu Qing's hand is ninety-nine, while the one bought in the county is slightly worse, but it also looks between eighty-five and ninety-five. If you let this moment be practiced, then you can use high-grade medicinal jade to make a convex lens for him in the future, wouldn't it be beautiful?

Xu Qing took the two pieces in his hand, so excited that he couldn't sleep all night, and Huang Shimei, who was harmed, was also excited, and took advantage of this sleepless night to squeeze Xu Qing's inventory.

On the second day, without waiting for dawn, Xu Qing turned over and got out of bed, not for anything else, just for the sentence that there are only tired cattle and no ploughed land. Looking at Xu Qing's back staggering away against the wall, Huang Shimei smiled with satisfaction.

And of course, for the sake of making telescopes!

Xu Qing sat in the study and recalled the principle of convex lens learned in junior high school, and he found that the vibration fluctuations and interference diffraction that he learned in high school and college were nonsense and unrealistic at all.

"Focus, uh, focal length, and other large inverted image ......"

Xu Qing lit a candle on the table, the convex lenses in his left hand, and the imaging plate used as a temporary rice paper in his right hand, carefully adjusting the distance.

It's almost done, and mark it with a straight stick, which is double the focal length.

Old man Ni Bai slept in the room, the old man had a short sleep, at this point, in fact, he had already woken up, but the weather was too cold and he refused to get out of the bed.

At this moment, someone kicked open his door and said eagerly: "Old man Ni, hurry up, go find a pipe so long and wide, bamboo!" ”