Chapter Ninety-Seven: Look at Back Pain Again

The one who kicked in the door was naturally Xu Qing! Xu Qing is also fun for a while, the ancient buildings he saw before, he even had to touch them carefully, but now when he sees his house, he suddenly wants to kick it and try it, and it feels good. It was bitter for Old Man Ni Bai, he was lying on the bed and enjoying the warmth of the bed, but he was suddenly frightened by Xu Qing so much that he was almost fifty years younger - he urinated directly on the bed.

"Hey, hey, my uncle, I'm scared to death of the little old man," Old Man Ni Bai hurriedly put on his clothes, and Xu Qing also said slightly apologetically: "Ni Bai, this is a terrible matter, a big matter, an urgent matter!" ”

Old Man Ni nodded yes and said to get up immediately. Xu Qing knew that there was no urging, so he stood aside and waited for Old Man Ni. Put on his clothes, step on his wool boots, and take Xu Qing to find a bamboo stick.

There are few bamboos in the north, and the county will always have some bamboo, while making mats and other objects. When I opened the warehouse, more than a hundred and ten bamboos were placed in front of me, but these were bowl-sized bamboos, and it was useless for Xu Qing to come. Seeing this, the old man Ni Bai took another dragon head bamboo, saying that this was used by the old man to make crutches, and after being cooked in lard, it was very tough and would not dry out. When Xu Qing looked at this dragon head bamboo, he remembered that the "old antique" family of later generations would plant a bamboo of this kind on the head of his ancestral grave.

Xu Qing subconsciously asked, "How many bamboos are there, take them all." ”

Old man Ni Bai shook his head and said, "Master, this dragon-headed bamboo was given by someone else, and there is only one at home." However, there are many elderly people in the surrounding big families, and there must be a lot of bamboo in this dragon's head. ”

Xu Qing nodded, picked up the dragon head bamboo in his hand, and found that it was about the same diameter as he wanted. So he said: "Ni Bai, I'll use this one first, and then you can buy some." If the master and I succeed, there will be a heavy reward, oh, by the way, this matter is not in a hurry, you can have breakfast first,"

Old man Ni Bai said that he went.

Xu Qing returned to the study with the dragon head bamboo, and compared the focal length and diameter he had recorded with this bamboo.

"Alas......" Xu Qing sighed heavily, the bamboo was a little bigger, and the convex lens couldn't be stuffed in, if the convex lens was sharpened a little, he was afraid of hurting the overall structure of the glass: "It seems that there is only the bamboo that Ni Bai brought back." ”

The dragon head bamboo was thrown aside, Xu Qing took out two convex lenses to play, the convex lens is a magnifying glass, when he was a child, he often held this in front of other people's eyes, a small sentence "cow eyes", but he didn't know that his own eyes were also cow eyes in the eyes of others. Magnifiers are only useful for things that are close, and for distances, you need two magnifying glasses to be superimposed on each other. After superimposing, you can only look far away at things within a certain range, and if you want to switch distances, in addition to changing a telescope, that is to focus. The focus can be reversed, and the distance between the lens and the rear of the lens can also be adjusted.

Thinking of this, Xu Qing picked up the dragon head bamboo again, and wanted to figure out how to make the structure of focus on this bamboo. Suddenly, Xu Qing knocked on his head and scolded: "Stupid," why? Because what he just measured is the outer diameter of the dragon's head bamboo, and the convex lens is stuffed into it and has a fart relationship with the outer diameter?

Xu Qing hurriedly tried to measure the inner diameter, but in fact, there was no need to measure it, just take the glass and put it on it? It turned out to be a little smaller, but this time Xu Qing was not in a hurry, but laughed. Because, if the bamboo is a little smaller, it can jam the convex lens.

Xu Qing slapped the table: "Find the carpenter at home!" ”

Ordinary carpenters can also do a little bit of carpenter's work, and they can still do such a small thing as connecting bamboo. Xu Qing solemnly handed over the dragon-headed bamboo to the carpenter, and asked him to make the bamboo in the dragon-headed bamboo the same. At this time, Xu Qing discovered that Longtou Bamboo had an obvious advantage, that is, his diameter was almost the same from beginning to end. If Xu Qing wants to make a telescope, he has to find a large and a small convex lens, and the dragon head bamboo is just right, and the two ends are the same thick.

The carpenter deserves to be hired by the Xu family as a special carpenter, the hand speed is like the arm of the unicorn, it is simply a show, three times five divided by two, and Xu Qing's dragon head bamboo is cleaned up. Xu Qing measured the focal length according to the distance calculated before, and asked the carpenter to choose the best section of the dragon head bamboo and saw it down. It's a little longer than it needs to be, in order to have an adjustment distance.

The carpenter naturally had no chance to know Xu Qing's purpose for making this dragon head bamboo, and Xu Qing took the empty dragon head bamboo back to the study. Carefully take out the baby convex lens, and put the two ends on in fear, this is not enough, the convex lens is easy to fall out. If this falls out, then Xu Qing's four or five days' "scientific research achievements" will all be in vain.

Wrap the two ends with a small hole fishing net, and at this time, Xu Qing dared to take it out and look into the distance.

Picking up the telescope, which was nearly three feet long, Xu Qing stood at the window, raised it, looked at it with one eye, and ......

Binoculars, it's really done!

Although it is a little blurry, as long as the distance is adjusted, although the grass cannot be seen clearly, the trees in the distance can still be seen clearly, you must know that people with excellent eyesight can only see so far, and it takes a lot of effort, it is basically enough to have this effect, and Xu Qing does not have extravagant expectations. The purpose of this telescope is just to detect the enemy's situation, Xu Qing took the telescope, and he could see the location of the enemy generals in the endless field, and in the hills, he could see the enemy situation on the mountain in front of him clearly in advance, and the role that this telescope could play was immeasurable.

After that, Xu Qing will polish more lenses and know the most suitable one. Of course, these can also be used as lenses for future focusing. Therefore, Xu Qing did not fix these two pieces. I went to a carpenter and made a lid out of the remaining bamboo.

Xu Qing placed two piles of books on the table, made a groove in the middle, put the telescope in the middle, sat upright, and carefully adjusted the distance between the two mirrors. Of course, you also have to appreciate the Bofu of Luonan County in the telescope.

I saw the camera turn, and a small attic in the distance was surrounded by fog. Xu Qingxin said, where did the fog come from at this time? Hurriedly pointed the camera there, only to see that in the small attic, a curtain was half-covered and half-hidden, and it was the fog coming out of it.

Take a closer look, there are two pairs of jade feet stepping on the lotus behind the door curtain, it turns out that the maids are taking a bath again!

The curtain must have been blown up by the wind, and the maidservants inside had not yet discovered it, and it was upstairs, and the place where the housekeepers lived was separated from it by a high wall, so the maidservants were also unscrupulous. Xu Qing didn't know if the telescope suddenly became clearer, or if his eyes suddenly became stronger, only to see that inside the door, the water splashed everywhere, and the maidservants were actually having a water fight! It's a pity that the curtain of the door has lifted a little bit...... Oh no, the curtain is blown!

At this time, Xu Qing chose to throw the camera over and stopped looking at it.

Why? Look again, back pain!