Early in the morning of the fourth day stipulated by Zhou Nan, the grinder who polished the crystal wafers rushed to see Zhou Nan. Although his eyes were bloodshot, he was excited.

From the dust marks on his face, the imprint of a boxy mask can be clearly seen, and it is obvious that this miller has become accustomed to wearing a mask to work when grinding the crystal lamp.

"Your envoy, please see, the small one will select the white crystal, according to what the envoy said, avoid the position of the flocculent flaws in the white crystal, polish all these white crystals, and polish out the lenses of different sizes and thicknesses, a total of sixteen!" As he spoke, the miller held the box containing the white crystal in both hands, and the sixteen chips in it were inserted vertically into the silk as if they were placed in a jewelry box, neatly and neatly, and would not bump into each other.

Zhou Nan took the box and took out a chip from it at random, this is a convex lens chip, the same as the last time I saw it, it is crystal clear and smooth, transparent and flawless.

Zhou Nan came to the door with this convex lens, and adjusted it slightly against the ground in the sun, and a dazzling bright spot appeared on the ground.

When the miller saw this, he was amazed and said, "It turns out that your envoy also knows the wonder of this dragon!" In the Great Song Dynasty, even those who read may not know about spotlight. In the opinion of this grinder, few scholars in the Great Song Dynasty know about it, and the Liao people will not know that it has such a wonderful function.

Zhou Nan took out a few more wafers and tried them, and sure enough, they were all the same crystal clear, and the surface was smooth and smooth.

The sixteen wafers are large and thick, others large and thin; Some are small and thick.

It's just that there are very few small and thin ones. Originally, it took three days to polish eight wafers, but this grinder actually polished sixteen wafers of different sizes in one go, which really surprised Zhou Nan.

Zhou Nan asked Xiao Jiu'er to reward the miller with two more silver ingots, and then let the miller go back to rest.

It only took a few days of hard work for this miller, and he actually earned a sum of money, and he took it with joy.

It's a pity that those amethysts, green crystals, and hibiscus stones don't need to be polished, otherwise they can make some rewards.

The grinder asked flatteringly: "Your envoy, those hibiscus stones, amethysts, etc. are all tributes sent from below, and they are in excellent condition, so why don't you make two pairs of jewelry for your envoy?" Zhou Nan could see the intention of this grinder, and he couldn't bear to refuse, so he said with a smile: "His Majesty the Emperor and the Emperor's carriage will also be used, if you make jewelry for me, won't it be enough?" ”

"Your envoy can rest assured. Where is the crystal in such a good condition used in the carriage?! It's just that the scraps I've cut in the past two days are enough. As soon as he saw Zhou Nan's heart, the miller immediately patted his chest and promised that even if he used scraps to decorate the carriage, others would only think that those crystals were used in the carriage.

"Then let's make two pieces at random! Well done, more than this reward! Zhou Nan said nonchalantly.

This is equivalent to paying only a processing fee, holding the emperor's treasure, holding the emperor's craftsman, to add it to himself, and of course he is willing to give the reward.

The craftsman almost cheered and ran out, grinding the chip in front is a mandatory question, and now making jewelry is a self-selected question, and the reward is more, of course, you have to work hard.

Zhou Nan waited for the grinder to leave, and then took out a concave lens from the box, and then took out a convex lens.

Then hold the convex lens in your left hand and the concave lens in your right hand, and place the convex lens in your left hand in front as the objective lens and the concave lens in your right hand behind as the eyepiece, and slowly adjust the focus to the tree in the distance.

As the distance between the two lenses continued to change, Zhou Nan finally found a clear, magnified image of the branches of the big tree.

The branches of the tree suddenly became much thicker, and the leaves on the branches became like a fan, and the veins on the leaves were as clear as in front of you.

"Hehe, it can really be done!" Zhou Nan looked at it and smiled, talking to himself, Xiao Jiu'er on the side saw Zhou Nan behaving like this, his heart was itching, and he asked, "Dazhai master, what kind of treasure are you doing?" Zhou Nan looked in another direction, and said, "When it's done, I'll be the first to show you!" Go and call the goldsmith now. Xiao Jiu'er didn't dare to delay, so she hurriedly ran out to find the goldsmith.

Although it is just an ordinary telescope, Zhou Nan doesn't want his treasure to be stolen by others, and these craftsmen are not from Liao.

Just like just now, when the grinder was there, Zhou Nan didn't debug the two chips together to see the effect.

Similarly, for this goldsmith, Zhou Nan naturally would not hand over the two chips to him, and let him make the barrel of the telescope according to the distance between the two chips.

Zhou Nan took a piece of paper from the table and drew it on it with a pen. Zhou Nan first drew a section of the barrel with the front objective lens, marked the size and edge thickness of the objective lens, and marked a fixed position on the barrel of the objective lens, indicating that the wafer with a protrusion in the middle needed to be embedded into the barrel and not exposed outside.

Then, behind the position of the objective lens of this barrel, I made a random mark, and picked a convex lens slightly smaller than the objective lens just now from the box, and marked the size and edge thickness of the wafer, indicating that the wafer should be embedded here.

Immediately afterwards, near the mouth of the barrel, Zhou Nan made another mark, and also selected a wafer, noting the size and edge thickness of the wafer.

This was, of course, so that the goldsmith could not guess how the elements would have to be assembled to make a telescope.

I believe that if someone follows the instructions of this craftsman to build a telescope, it will be a mess. After drawing the barrel of the objective lens, Zhou Nan did the same and drew the barrel of the eyepiece, which was also filled in with the position of a few chips.

By the time Zhou Nan finished painting these, the goldsmith who had been bored and melted the gold collar for a few days was already waiting outside the door.

Zhou Nan called the goldsmith in, asked him to stand in front of the table, pointed to the two ends of the barrel drawn on the picture, and explained to him the marks he had made on it.

The goldsmith looked at the picture for a while and said, "The meaning of the noble envoy has already been understood. It's pretty clear on this picture. Zhou Nan said: "It's just that the two sections of the barrel body should be connected together, and they must be able to slide slightly back and forth, but they can't slide too much." Can you do it? ”

"The small one can make grooves and ridges on the barrel body, so that the grooves and ridges are opposite, so that the two barrels will not move at will, and the barrel can slide back and forth." The goldsmith thought for a moment and said to Zhou Nan.

"That's good, go ahead and do it!" Zhou Nan said to the goldsmith. The goldsmith hurriedly agreed, and he was about to go back, and Zhou Nan deliberately ordered: "Remember the position of each lens in the middle, you can't be wrong at all!" ”