After Zhou Nan arranged the carpenters, he called the two craftsmen sent by the ghost envoy to make jewelry, one of the two craftsmen was a grinder and the other was a goldsmith. Zhou Nan found two boxes of gold collars and three boxes of crystals from the materials, and in this courtyard, he specially designated two houses for the two craftsmen to build telescopes.

The grinder polishes the crystal to make the lens of the telescope; The goldsmith, of course, is going to be used to create the golden telescope barrel.

Zhou Nan asked the two craftsmen to bring their own tools and raw materials, live in their own houses, and start working. The goldsmith is a good arrangement, anyway, these gold collars always have to be refined first, so let him make a telescope barrel out first, and practice first.

The goldsmith did not say much about such a strange request, but took the two boxes of gold collars and went to make a fire in his house.

Zhou Nan asked the miller to separate the three boxes of crystals according to color, and put away the colored ones first, and only select those crystals that are pure and transparent.

Soon the miller was able to divide the crystals. I saw that only half of the box was white crystal, and the other two boxes were full of colorful crystals, including amethyst, citrine, blue crystal, brown smoky quartz, green crystal, and a pink crystal. According to the miller, this pink color is called hibiscus stone, and it really looks like the color of hibiscus flowers. Any piece of crystal, if it is obtained in the afterlife, is enough to make the women on the street scream.

Zhou Nan picked up a piece of transparent crystal, held it in his hand, and looked at the reflection of the surface with the light cast by the light or the window, only to see that the surface had an oily luster. Zhou Nan picked up a thin sheet of transparent crystal, through which the pattern could be clearly seen.

"These are all crystal tributes from Donghai County, Haizhou, and they are all fine crystals." The grinder saw that Zhou Nan seemed to identify the crystal again, and explained to Zhou Nan.

"Hmm...... Would you polish this piece of crystal into such a shape? Zhou Nan held the thin crystal in one hand and drew a convex lens on the ground with the other.

"Your envoy wants to grind it?" The grinder carefully identified the shape drawn by Zhou Nan and opened his mouth to ask.

"Huh? What is it? Zhou Nan asked strangely.

"That's ......," the miller glanced around the house with his eyes, not knowing what he was looking for, and finally stammered, "Sniff...... It is the size of a large amount of money, and it is made of such white crystal, and the old man's eyes are dizzy, and he cannot read the book, so he can see clearly by covering it in front of him. ”

Zhou Nan suddenly realized, it turns out that the people of this era have glasses! Zhou Nan didn't care about emotion, since you kid can polish reading glasses and the like, this is easy to say. Zhou Nan said to the grinder: "Exactly! You first polish out a piece that is so big and so thick. Zhou Nan gestured with his finger and told the grinder the thickness and size of the convex lens.

"It's easy." The miller dragged a wooden box from the side and took out a set of tools from it. I saw that there are round iron discs, circular saws, drills, cones, cowhides, etc., and the round iron discs are installed on the horizontal axis of a pedal and can be rotated.

"What's this called?" Zhou Nan asked, pointing to the round iron disc that could be rotated.

"This is a stone, which is used to polish jade." The miller replied as he fixed the thin crystal. After fixing, the grinder began to step on the East Circle Iron Disc and began to rough grinding. With a screeching sound and white dust mist flying up, Zhou Nan looked bored and left. This kind of jade polishing work is a delicate work, and a slight mistake can shatter the whole piece of jade. Besides, it is not a moment and a half to polish it, the faster it begins, the more it takes to polish it, the more it takes to polish it, the more it takes more effort to polish it.

Zhou Nan went to the carpenters and bamboo craftsmen to take a look, and the craftsmen had broken the wood they brought, first cut it into wooden planks two inches thick and three zhang long, and then took materials according to the size of each part of the carriage and made them according to their needs. For a while, the big saw erected in the courtyard did not stop for a moment, and the sawdust on the ground was covered with a thick layer. Among them, there are probably craftsmen such as foremen, who constantly watch the progress of each craftsman one by one.

Zhou Nan saw that the craftsmen were busy step by step, so he went back to his yard. This day, I was really tired. Not only did the body not rest, but even the mind did not stop for a moment. It's even more tiring than three days on a regular day. After eating some dinner casually, Zhou Nan fell asleep.

In the early morning of the next day, after Zhou Nan got up to wash, he went to see the grinder first. The grinder patiently sharpened the lenses motionlessly and patiently in the rotation of the iron disc, and the dust was still flying around him.

Zhou Nan left here silently, went straight to the craftsmen, and asked, "Is there anyone here who can do fine silk work?" ”

One of them replied, "The small ones are made of carriage hangings and tops, and can do fine silk work." ”

"Okay, take some fine thread, silk, and some of the finest sawdust." Zhou Nan said to the craftsman. This craftsman hurriedly took the needlework from the middle of the materials, and carried some fine wood chips, and followed Zhou Nan over.

Zhou Nan saw that the grinder always had to work in the dust and mist, which was really pitiful, so he thought about making some masks and coming out. He asked the craftsman to cut the silk into four inches square, then sprinkle it with a layer of fine wood chips and spread it with a layer of silk. Then the two layers of silk are sewn together with needles and threads, and the middle is sewn into a nine-square grid, so that the sawdust does not gather together. Then sew it on the outside with another layer of silk. Finally, attach the straps on both sides so that you can put it on your ears. In this way, a mask was born in Dasong Tokyo. The wood chips filled inside can be used as an adsorbent and play a good protective role.

Zhou Nan watched the craftsman do it, took it, put it on his face and tried it, although it was full of sawdust, it was very light, and there was a faint fragrance of wood. Zhou Nan called the craftsman to come to the miller's house, and the craftsman immediately understood Zhou Nan's intentions and said, "The little one knows how to restructure." ”

Zhou Nan took off the mask and handed it to the craftsman for him to improve. Zhou Nan took a cursory look at the side, and saw that the crystal lenses in the hands of the grinders had become much more detailed, and the tools for polishing the crystals had also been changed to abrasives made of cowhide, and some fine powder and water were sprinkled in the middle from time to time. Zhou Nan didn't bother the grinder and quietly left here.

When Zhou Nan returned to his yard, he found that Shen Ding and Sun Rong, the carpenters of Sanssouci Village, had already arrived and were waiting for him accompanied by Xiao Jiu'er. When they saw him coming, they all stood up with a grin.

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