A group of four people came to Yu Linglong's factory again, still in the huge sealed container on the second floor, and the four of them stood there waiting for Yu Linglong.

While waiting, Chen Ziyang glanced at the items in the lattice above the ground, the old copper tripod was gone, and several things in the other lattices had been replaced, it seems that this jade Linglong is really busy, I don't know how many self-righteous collectors will be pitted when these things flow to the market.

After a while, Yu Linglong walked in from the door of the container with a plate. When she came over, several people looked at the things on the plate in Yu Linglong's hand, and they were all stunned, and there were two golden discs on the plate!

"Linglong girl, you've been tired for the past two days, but why is there two pieces of this thing?" Wang Chuan didn't understand Yu Linglong's intentions, originally he just asked him to help make an imitation, but he took out two at once, could it be that Yu Linglong also started to buy one and get one free here? Wang Chuan hurriedly asked the reason.

Yu Linglong lit a cigarette, took a puff, and then pointed at Yang Lei with her finger and said, "You should really be grateful for the growth of so much flesh on his ass, in the wax mold made of the imprint on his body, I found that there are some seams on the edge of this disc."

Later, I remembered what you said that this thing could be a cog, and I understood the reason. This disc should be a gear, as you say, but the card slots around the gear are hidden inside the disc.

There is a circle-shaped pattern on the front and back of the disc, and the size of the two circles on the front and back is the same, I estimate that this circular pattern should be similar to a bearing, which can be rotated, and the gear card groove hidden inside the disc will be exposed after turning.

However, because the lines on the side of the disc are not too clear, I can't judge the width of these gear slots, and I can probably judge that there are two possible compositions of these slots according to a few obvious traces, so I made two imitations for you, both of which are different in width and length. ”

After listening to Yu Linglong's words, Chen Ziyang and Wang Chuan glanced at each other, and then one of them held a disc, pressed the front and back of the center of the disc with his thumb and index finger respectively, and then slowly rotated the surface of the disc. Sure enough, as Yu Linglong said, as the disc rotated, several card slots hidden in the middle of the disc slowly stretched out and became the shape of a gear.

The two of them nodded at the same time with a sudden realization, what is professional quality, what is industry discipline, this is vividly shown in Yu Linglong's body. This is really a thief, Chen Ziyang thought in his heart, don't look at Yu Linglong as a fake, but with this rigorous energy, it is no wonder that she can have today's achievements.

Seeing that a few people understood what they meant, Yu Linglong continued: "In addition, regarding the material of this disc, I am sure that the prototype of this disc is definitely not made of gold, even if it really contains gold, I estimate that it is only plated with a thin layer of gold on the surface of the disc, for the purpose of looking good."

Gears need to be load-bearing, and the gold is too soft to bear too much weight, otherwise it will be deformed and lose the role of the gear. Combined with what you said, this disc may have been cast in the Bohai Ancient Kingdom, and I estimate that the original disc was mainly made of copper.

During the period of the ancient Bohai Kingdom, the Bohai Kingdom had to pay tribute to the Tang Dynasty a large number of northern specialties, such as mink skins and medicinal herbs, which had to be presented to the Tang Dynasty on time. At the same time, a large amount of copper was also offered, so it can be judged that the copper smelting industry in the ancient Bohai country was relatively developed during that period.

However, copper is malleable and is not suitable for making gears, so I estimate that the material of this disc is actually an alloy of copper, most likely a special brass alloy. Brass is an alloy made up of copper and zinc. If it is only made up of copper and zinc, it is called ordinary brass. Brass is now commonly used in the manufacture of valves, water pipes and other objects.

If it is a variety of alloys composed of more than two elements, it is called special brass. Lead, tin, manganese, nickel, iron, silicon, etc. can be mixed with brass to form special brass alloys.

The combination of different elements and copper will lead to different characteristics of the alloy, in fact, it is not that the smelting of alloys in that period is very developed, but that the purification of copper in that period is not as good as it is now, so it is often mixed with some other elements in copper, it can be said that the special brass of that period is because the purification of copper is not in place.

Special brass is now also called special brass, which has high strength, hardness and strong chemical corrosion resistance. Generally, the copper content is about 62%~68%. The two discs in front of you are both cast with this special brass alloy, and I hope you are still satisfied. ”

After listening to Yu Linglong's tirade, several people were stupid, and their mouths were so wide that they could almost stuff a goose egg into them.

Yu Linglong's words are reasonable, and I don't know how much knowledge is in her little head. With only a few words from a few people and the trivial fragments provided, coupled with the background of the ancient country of the Bohai Sea, she was able to analyze this disc so thoroughly, and several people quietly gave her a thumbs up in their hearts.

In fact, it was not of much use for a few people to ask for this disc, all they wanted was the map about the Bohai Palace on the disc, and the reason why Yu Linglong asked Yu Linglong to help copy this disc was for fear that something on the map would be missing.

Because Yu Linglong helped them completely extract the patterns on the disc before, this disc was not of great significance to Chen Ziyang and a few people. Their main purpose is to wait for Lin Xueping's arrival, and they don't need to enter the Bohai Palace.

Although Wang Chuan was once moved by the treasures in this underground palace, at this time, for him, the life of his daughter Wang Lele was more important than anything else. And Chen Ziyang and the others also have this idea, the purpose of their stay is to save Wang Lele, otherwise, now a few people are already in Dawalnut Town, talking and laughing and drinking.

Although everyone likes money, but they also have to have a life to spend, after so many things, a few people don't want to risk their lives anymore, not to mention that although the money on hand is not much, it is enough for them to live the rest of their lives in peace.

Although this disc is not very important for this operation, it is guaranteed that it can be used when looking for Lin Xueping, and there is a great possibility that it can help Chen Ziyang crack the secret of the map above, so several people are also very happy.

Wang Chuan handed Yu Linglong a check again and paid for the production of the two discs. After saying goodbye to Yu Linglong, on the way back, Wang Chuan vigorously persuaded Chen Ziyang and asked him to relax, with his level, he could not crack the secret of the map on this disc in such a short time, and there might be no progress on Lin Xueping's side, so there was no need to worry.

Chen Ziyang knew that Wang Chuan just wanted to relieve the pressure on his heart, so that he could be more likely to crack the secret of the map in a short time. In fact, Wang Chuan's heart is more anxious than anyone else, Chen Ziyang can see this, but what's the use of being anxious? I've really done my best.

Before, Chen Ziyang thought that even God was helping them, first by chance, the red-hot disc left two marks on the bodies of Yang Lei and Umbrella Shishuai, and then met such a capable person as Yu Linglong and copied the disc.

Wang Chuan's team is almost organized, the equipment of Umbrella Shishuai is basically complete, and Yang Lei has also absorbed a lot of knowledge about the ancient country of Bohai, and he has obtained a lot of such important clues about the application of gossip in the ancient country of Bohai from Xiao Siyan.

Everything was going in a good direction, but now it is blocked by an insurmountable chasm that cannot be cracked the map.

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