Yuan Cheng didn't say anything, just let Yixue look at the lake, under the afterglow of the sunset, the lake was glowing with orange light, the breeze blew, mixed with orange fragrance, and the lake surface was also broken into golden glass, shaking gently.

Yuan Cheng has seen these scenery many times, but the first time he watched it with Yi Xue, he was inevitably still a little excited, he didn't know what Yi Xue was doing,

But he knows that predicting the future from small things, at least where he can see and touch, will not walk away, so he is satisfied.

By cutting one side of the wooden core, the material is trimmed to a thickness in the middle and a little thinner at both ends, and then the two ends are slightly narrowed by the two sides, slightly like a flat shoulder. The two ends are further trimmed into an octagonal shape with a planer.

In the trimming, it is necessary to achieve a smooth surface, symmetrical at both ends, and consistent thickness in order to exert force evenly. Once the shape has been cut, a flexure test is performed to check whether the elasticity of the bow's segments is uniform.

"The one who bows, kneading the wood and the string is the arrow".

He knew that if he pleaded on the spot, he would definitely be more guilty of seducing Dai's courtiers and make the emperor angry, so he asked his father to beat him the next day, and according to his father, the emperor's face softened a little at that time.

The longbow has a simple rounded arc shape, and there is no complex shape of the Celestial Empire Angular Bow that curves back. If you don't need to roast the bow, it will reduce the tension of the bow, and you won't be able to bend it all at once, so that the back of the bow will not break and cause internal injuries and lose its elasticity.

The two of them were silent with each other like this, and the wind kept blowing on Gencheng's cheeks and around his hair, trying to bring this tenderness to Yixue as well.

Tie the rope to both ends in the relaxed state of the bow back, put the center of the bow back on the groove of the bracket, use even force, slowly pull the string, and hang it into the first string groove, and the bow back is slightly bent.

Then pull the rope apart, gradually increase the opening and hang the groove downward, and keep trimming the bow back until a satisfactory and uniform arc is formed.

couldn't help but feel palpitations, hesitated for a long time, took a deep breath, and turned her head to see that when she saw Xue Xue, she was actually asleep, right next to him, but an arm's length away.

Yuan Cheng's head was hot, and he stepped forward, stopping at a distance where he could feel each other's breathing, and looked at Yi Xue's face by the moonlight,

There are 266 kinds of mineral medicines listed in the book, and in addition to the three parts of water, fire, and earth, there are more than 160 kinds of mineral medicines contained in the gold and stone department, including appendices, which are divided into four categories: gold, jade, stone, and halogen.

This "round edge" is the forerunner of various types of chisel knives used for drilling in modern times, and it is indispensable in deep well drilling.

"There are shallots on the hills, and silver below; There are shallots on the mountains, and gold below; There is ginger on the mountain, and copper tin below; There are precious treasures in the mountains, and the branches of the trees are drooping. ”

Before leaving, Gencheng brought a woman's cloak from home and asked his sister to order it for him. Although I don't know the size of the snow, I don't know why, but if you make a little comparison, you will remember the scene where the emperor fell into the water where the ice and snow melted, and he went to see him at night and secretly hugged him.

Underground, miners use boat-shaped wooden discs and other instruments to carry out gravity beneficiation to determine the grade of ore and determine the direction of mining. They were very precise in selecting the high-grade areas of the ore bodies in the fault contact zone for mining.

The place to see the stars is the grassland in the northwest, where there is a Baiga Lake, which Gencheng likes very much, just like meeting Lake Led in Brin, and he wants to ride a horse to it.

Yi Xue's riding skills are not very good, although Yuan Cheng asked her to ride the same horse with him, but he was worried that Yi Xue would refuse, so he didn't go, so Yuan Cheng still led two horses.

At the same time, a series of complex technical problems such as underground ventilation, drainage, hoisting and roadway support are preliminarily solved by various technical means.

At the gate of the Prince's Mansion, Yuan Cheng personally tied a cloak for Yi Xue and said to her gently: "It's going to be a little cold at night." ”

Yuan Cheng looked at Yi Xue's face and turned cold again, thinking that she didn't like the color of the cloak, he was selfish, and instead of the peach color commonly used by women in the Central Plains, he used the emperor's favorite light cyan.

The cold flue gas may be natural gas that contains more carbon monoxide. The depth of the mine and how to prevent cold smoke are mentioned here, but the structure of the mine as a whole is not described.

It was the color of the white jade, and it was rubbed into the pearl, if there was moonlight, it would also reflect the streamer, and there was a silver-white fox hair, and they met because of a jade hairpin.

And he himself used crimson purple, slightly darker purple, with black raccoon dog hair. He originally liked dark colors, but the emperor said that he was too rigid and too dull compared to his yellow dragon robe, so he used purple.

Yuan Cheng paused for a moment, Tao Gongzi, Tao Yixue, Tilt, woman......

In the next second, he shook his head, broke free from his memories, and chuckled, thinking that he was not crazy, and he would link the two so far-fetchedly,

During the period of vigorous development of large-mouth shallow well-type salt wells, it was possible to mine not only the underground salt brine marked by natural salt springs and salt rocks, but also the underground salt brine marked by natural salt springs.

"I don't know if you don't like this color, so you won't wear it next time."

Yi Xue didn't know why Gencheng suddenly said this, but she noticed his chuckle just now.

Squinting his eyes, he asked, "What were you just laughing at?" ”

The lead-dominated lead-zinc-copper polymetallic deposits also exist with greenstone on the top and tin on the bottom, and the greenstone on the top and red copper on the bottom is also an accurate reflection of the actual situation.

Yuan Cheng tied her cloak for her, looked at her slightly pursed little mouth, powdery, doting the corners of her mouth, touched her head, and turned to lead the two horses to Yi Xue.

Copper gives the glaze an emerald green color, and iron gives the glaze a yellowish-brown and brownish-red color. Adding a small amount of cobalt-containing or manganese-containing minerals to the lead glaze will also give a variety of different shades of glaze such as blue and purple.

This horse was also specially chosen.,It's a smaller pony prepared for the snow.,I remember but in order to avoid Suyu Suqi Yuancheng temporarily took her to ride a horse.,And deliberately picked a sweaty horse that ran fast.,Hurt her legs so much that she couldn't get off the ground at all in the next two days.。

The main coloring elements in ochre color are iron, and the main coloring elements in black color are iron and manganese. Therefore, it is estimated that the ochre color material may be ochre, and the black color material may be a red clay with high iron content, or black gold and purple gold soil.

His own horse is also, he did not lead the dust that he often rides, but led the horse of Yuan Zhen, who is not in good health, and the horse will not run too fast.

He helped her on his horse and said, "Because you are beautiful." ”

Yuan Cheng has also become extremely straightforward today, although he is a son of the grassland, he has lived in Dayu for many years, and his temperament is not as outspoken as a nomadic man.

The cat's whole body is pure white, with a black or yellow mark on its forehead, a black mark on its white head means a hanging mark, and its tail means a drag gun, also known as a star cat.

Maybe it was the emperor's words yesterday that inexplicably made him angry, or the prince's plea made him angry, or maybe it was this night that knocked off Yuan Cheng's protective shell, and he wanted to be presumptuous today.

Yi Xue naturally understood that Yuan Cheng was thoughtful and she couldn't do it, and even where she thought of it, the outspoken prince also caused her a lot of trouble, and Yuan Cheng's move actually helped a lot, so the queen could recruit her into the palace to show relief.

"Even if you go to Guozixue and find out the way, you have to send someone to go, maybe there is more than one place, and you still need to think of a reason......

But Yi Xue didn't want to admit that she lived very hard, but it was not as good as Yuan Cheng's words. Pretending not to be impressed, he let out a soft "um" to mean that he heard it, but his eyes looked intently into the distance.

Yuan Cheng was very irritable, and he couldn't talk anymore, so he simply lay on the grass. Pretending to be light and breezy, he said to the snow that the night sky was beautiful.