These little things are not used to coax children to play at home, but are related to Xu Qilin's great career of becoming an official and becoming a knight. I didn't think about it so thoroughly, but now that there are conditions, Xu Qilin wants to be perfect.

"Dad, mother, look, is that Chang'an?" Sanni suddenly stretched out her hand and pointed, her tone full of excitement and anticipation.

Sun Li put down the carving knife in his hand, looked at it for a moment, and turned his inquiring gaze to the man.

Sun Ah Si nodded and said with emotion: "I haven't been here for a few years, and I may not be able to recognize it." ”

In ancient times, people, especially peasant households, lived a self-sufficient life, and the means of transportation were inconvenient, and some of them traveled around a radius of dozens of miles all their lives.

A craftsman like Sun Asi, who has traveled from south to north, traveled hundreds of miles, and been to Chang'an, can already be regarded as having seen the world.

Even Xu Qilin, whenever he saw this majestic international metropolis, whenever he walked to Suzaku Street, which was about 150 steps wide, he couldn't help but be impressed by the Tang Dynasty's demeanor.

You know, this was more than 1,000 years ago!

Only in the world is Chang'an, there are more than one million people, there are rows of shops, and only then can you see the people of all countries, nationalities, and colors gathered here, and you can appreciate the grace and grace of all rivers.

After entering Chang'an City, except for Xu Qilin and the servants in the original house, the eyes of Wu Xiang and Sun Asi were not enough.

Sanni was excited, and was stopped by her father, not daring to shout, but her little head turned happily, looking at this and that, and the expression on her face changed back and forth.

Xu Qilin asked the servants and the vehicle to go home first, only taking Wu Siong and a family member, and stopped by a well-known jewelry shop.

"Young Master Xu, please come in." The guy nodded enthusiastically and respectfully, making Xu Qilin admire his memory, just after coming once, he remembered him.

"The shopkeeper is here?" Xu Qilin walked into the store and asked.

"Yes, yes, right away." The man answered in a loud voice, and asked people to call the shopkeeper.

There was not much time, and the shopkeeper walked out of the back room with a box in his hand, and when he saw Xu Qilin, he was also polite and respectful, "Erlang is really punctual, the objects you want have been polished, and the villain is waiting for you to pick it up!" ”

Xu Qilin stretched out his hand to take the box, opened it and looked, several pieces of uneven crystal pieces of different sizes were lying at the bottom of the wooden box padded with red silk, which looked very crystal clear.

"The size is exactly what you want." The shopkeeper is showing his skills on the side, boasting of his own craftsmanship, "There are always more than a dozen times of coarse grinding, fine grinding, and water grinding, and it is only ......"

Xu Qilin picked up a lens and took a look at his hand, the instantly enlarged pores, the smooth and traceless surface, and the relatively upright focus made him feel satisfied.

"Your craftsmanship really lives up to its reputation." Xu Qilin put the lens back and motioned to his family to take the money and settle the account, "If there is a transparent crystal in the future, I will send someone to inform you, and the price will not let you suffer." ”

The shopkeeper took the money, and after counting it, he smiled and complimented: "But there is the crystal that Erlang said, and the villain will be a prophet to you." ”

Xu Qilin nodded, got up and handed the box to Wu Xiang, and arched his hand to the shopkeeper, "I'm sorry for you, I'll leave today first." ”

"Erlang walks slowly." The shopkeeper sent it to the door before returning to the store.

Xu Qilin was very anxious and excited, all kinds of objects were ready, and the world's first telescope was about to be born in his hands.

"Erlang, this thing is very precious, isn't it?" Wu Xiang saw that there was a lot of money for the shopkeeper, and asked guessingly, holding the box firmly in his hand.

"It's just a rarity." Xu Qilin tried to say in a flat tone: "If you want to do more, it's very difficult." ”

Of course, transparent crystal is expensive and small, and the lenses polished today are a few small materials, and the cost is not very much. And the effect is equivalent to the children's toys of later generations.

If you want to produce transparent glass, and the properties are relatively close to optical glass, Xu Qilin is not impossible.

But if it is really successful, it needs to go through thousands of experiments, and he doesn't want to waste that time and energy now. More importantly, financial resources do not allow it.

This brings us to the essential skills of the traverser, steaming wine, mixing gunpowder, making steel, burning glass, making soap, and making cement.

If someone says I don't know any of this, it can only be said that you are illiterate and have never even attended junior high school.

By yes, it doesn't mean that you've done it yourself, but that you know the principle, or the recipe, even if it's not absolutely accurate.

As long as you go to junior high school and can graduate, you will have a foundation in physics and chemistry, and most of you will know that glass is made of sand (quartz sand) and soda, and that limestone and clay are the main raw materials for cement.

That's it, do you have to burn it by hand?

The ancients didn't know as much as you knew, and they relied entirely on groping to make things like glass and cement from scratch.

A modern person cannot rely on his own knowledge to study and experiment, even if it is a poor period of years, tens of years, or decades, and he still does not believe that he cannot make the same two things.

Of course, if you have mastered more knowledge, and even read a few time-traveling novels, then you are already standing on the shoulders of giants, and you will get twice the result with half the effort when you invent and create.

When Xu Qilin returned to Xu's house, his mood was a little calmer, he had finished washing, changed his sweaty clothes, and listened to the report of the housekeeper, only to know that the little sister went to the palace today, and the eldest brother did not come back in the Hongwen Pavilion.

"The Zhaojia porcelain kiln outside the city sent a batch of porcelain bottles, saying that they were customized by Erlang and had received the backyard warehouse; Boss Xu came yesterday and sent some spices and medicinal herbs, saying that it was a list from Erlang. The housekeeper took the list and handed it to Xu Qilin to check.

Peppermint, camphor, borneol, honeysuckle, sandalwood, orange peel, musk......

Xu Qilin nodded lightly after reading it, even if the memory is not complete enough, it is not a problem to make a copycat version of the Liushen Flower Water, anyway, the Tang people have not used it, and no one doubts what flavor he makes.

"Boss Xu still left a message, wanting our chef to help in the restaurant for a few more days." The steward hesitated for a moment, and then added, "Or, ask Erlang to leave the cook in the restaurant." ”

Xu Qilin smiled and said, "Let someone bring a message to Boss Xu, if the chef himself is willing to stay in the restaurant, I have no objection." ”

It's just that he taught some stir-frying methods, and Xu Fu is not a cook, even if he teaches now, he is in a hurry. As long as the treatment given by Boss Xu is good, and the cook is willing to change places to work, Xu Qilin will not force him to stay.

The steward retreated, and Xu Qilin rushed into the workshop after eating, took out the cardboard tubes, fish bladder glue, paper tapes and other things that had been prepared, and began to assemble the toys - well, it was an epoch-making invention.