Wizard: I Brought the Wrong System - Chapter 329

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After cooling in the stone grooves, the next step is sanding.

First, rub it back and forth with a grindstone with the same groove. The hardness of quartz glass is higher than that of ordinary glass, but it cannot withstand Yarrow’s strength. , but the degree of the convex mirror is getting more and more accurate.

After grinding the large convex mirror, and then grinding the small one, the two convex mirrors have all become gray, and some small scratches can be vaguely seen on them.

Yarrow changed materials and continued to polish.

Fine grinding flakes, fine sand, semolina, pearl powder… Yarrow has no sandpaper to use, and can only find these natural materials instead.

The fine sand is about 40 mesh, the semolina is about 80 mesh, and the pearl powder has reached 200 mesh… Yarrow’s movements are gradually irritable.

The mesh number originally refers to the fineness of the sandpaper, specifically the number of particles per square centimeter. The higher the mesh number, the more obvious the polishing effect.

As long as you are patient and have enough grinding materials, a stone can be polished into a mirror that shines brightly.

When grinding, the number of meshes can only be increased from small to large, and even there cannot be too many numbers in the middle, otherwise it will be very laborious to polish.

It’s like Yugong moving mountains, but he is holding a small spoon.

After grinding the one-digit mesh, take the thousand-digit and ten-thousand-digit mesh number. The tooth groove left in the front is too deep. The grinding of the thousand-digit and ten-thousand-digit mesh can only grind to the surface of the tip of the tooth groove, and it will be very difficult to grind. ‘s laborious.

Of course, two hundred eyes was still not enough, Yarrow continued to change materials.

Linen cloth can be polished to more than 1,000 meshes, and it will feel ‘moist’ after polishing.

A human hand or a cotton glove can reach 3,000 eyes. At this time, the lens is like some permanent objects. It can illuminate the human figure but it is difficult to see it clearly.

The last is wool felt, the same wool felt used in the last polishing process of glass products in the previous life, and the finished product can reach the level of 5,000 to 7,000 meshes.

“Finally done!”

Yarrow shook his sore arm, looked at the two transparent lenses, and finally breathed a sigh of relief.

Pick up the mirror barrel made earlier, put the two lenses in, and try to look at it.

“Huh? Why are there some lakes?”

It’s definitely not a lens issue.

After all, Yarrow had already checked the permeability of a single lens.

“Is the data given by the academy wrong?”

Yarrow tried to fold the mirror barrel, but the more the mirror barrel folded in, the more difficult his vision became.

This shows that the distance between the light rays of the two lenses exceeds the length of the mirror barrel.

“Is it because quartz glass has a lower refractive index?”

When the angle of incidence of light is fixed, the greater the refractive index, the smaller the angle of refraction.

From this point of view, it seems that ordinary glass is better. After all, the higher the refractive index, the shorter the distance of the mirror barrel.

But you know, the curvature of the lens can be adjusted, as long as the convexity is adjusted, the mirror barrel can be as long as you want.

But the higher the refractive index, the more severe the dispersion and the lower the clarity.

As far as the current lens is concerned, if the distance of the middle mirror barrel is adjusted well, the distance that can be seen can be much farther and the clarity can be higher.

This is a good thing.

It’s not too difficult to adjust, just add a section to the mirror barrel.

It’s just that the width of the mirror barrel and the convexity of the lens have been fixed for a long time. Even if one section is added, you can only see the farthest, not like the original mirror barrel, which can be divided into three sections for viewing.

If you want to achieve the original effect, you need to recalculate the width and length of the lens without adjusting the power of the lens.

Or continue to debug, rely on experience to modify.

Yarrow couldn’t remember the refractive index of quartz glass, it was a lot of work to calculate, not to mention that in the current situation, as long as the telescope can see far enough, there is no need to worry about adjusting the distance.

After sorting out the courtyard a little, I selected some materials and daily necessities to earn space rings.

Yarrow walked into the forest. After confirming that there was no one around, he activated the flying pendant with his own magic power. After reaching the maximum height of the flying pendant, he got into the console of the glider, controlled the glider, and moved towards the Perrin Manor. direction to fly.

Perrin Territory is close to the mountains, and the surrounding terrain is uneven and there are many valleys. Especially on the side close to Perrin Territory, there are not only deep pits, but also two towering peaks that can be seen from Perrin Castle.

Due to the remoteness of the terrain and the steep roads, neither of the two peaks has a name.

Yarrow’s goal was the shorter and closer mountain.

Wangshan ran dead horses. Even though Yarrow had looked at the mountain as early as in the castle, due to the distance, he could not estimate how big the mountain was.

It was only when Yarrow landed on the mountain in a small circle, saw a few tall ‘small trees’ in memory, and looked back at the castle, but only saw a small black spot. How far is the mountain.

“That’s fine. With such a long distance, it can also prevent the following wizards from finding their hiding place.”

Among the tricks that Yarrow exchanged, there is a wind spell that can make people’s eyes see far away. The original name of UU reading www.uukanshu.com is just a word, which cannot be directly translated. Yarrow refers to it as ‘ Hawkeye’.

In fact, it’s not just the wind element, there are also many spells in other categories that can see far away, but Yarrow made a choice and did not waste the contribution value to exchange all.

“The price of the distant view trick is not high, which may also mean that this type of spell has a lot of liquidity. Just hiding so far is still not enough insurance.”

Thinking like this, Yarrow climbed the tree, jumped to the edge of the mountain, and stopped at the side of the castle.

“It should be almost here.”

This is the sunny side of the mountain, and Yarrow chose a corner of a rock. As long as he walks out of the cover of the rock, he can see the castle unobstructed.

Setting up the telescope in the corner of the rock, Yarrow tried to look at the castle.

“The quartz telescope is really good. Although I still can’t see everyone’s appearance, I can vaguely see everyone’s clothes. Based on these clothes, I can roughly tell who is who.”

After confirming that the telescope was indeed effective, Yarrow took some dry grass and vines from the ground, weaved it into a fine small net, and then covered it over the lens of the telescope to prevent the telescope from reflecting and being noticed by others.

After finishing these, Yarrow began to organize his residence.

He didn’t plan to make it too complicated, he directly covered the glider between the rocks, and then pressed the edge of the glider with a stone.

Then I cleaned the ground, dug a trench to divert rainwater, and spread a layer of sulfur powder on the ground to get rid of mosquitoes.

After finishing these, he took out the space ring, all the grease accumulated in the castle in the past few months.