On the thirty-sixth day after the crossing, the weather was fine.

Early in the morning, a group of people carried a large stone plate, and were walking in the middle of the road in front of the small building, and stopped about 20 meters away from the small building, and there was a stone platform that was put there sometime.

If you look closer, you will see that they are carrying a disc with a straight metal pestle embedded in the center, which is at right angles to the surface of the disk.

In addition, walk along the edge of the plate, there are neat and equal scales, and there are both sides, the scale is long and short, the elder is fifteen, and the short one is thirty-two. The long scale also corresponds to the fifteen to fifteen, respectively.

It's a sundial. It was led by Yu Wenkai.

Upstairs, Li Kang withdrew his gaze and let them try, but he didn't hold out hope.

Don't look at the sundial, this thing is simple to make, but the knowledge involved in people's use is very wide.

The sundial should be parallel to the equatorial plane, the sundial needle should always point to the North Pole sky, and the angle between the sundial and the ground plane should be exactly the same as the current latitude.

Oh my God, I don't know how the ancients measured this tall thing?

Anyway, Li Kang can't do it, and he doesn't believe that the people below can do it, this is not the earth, and it's difficult to try it with experience!

In addition to the sundial, Yu Wenkai also led a group of people to tinker with the water transportation armillary sphere in his spare time.

Although they may not produce results, Li Kang is very sure of their spirit of study.

After breakfast, Li Kang summoned Yang Pingwei and Feng Wenhan.

"Fude, I forgot to ask last night, how often does their market open?" Li Kang leaned comfortably on the Taishi chair and looked at Yang Pingwei standing in front of the table with a smile.

The student asked the leader of Tanglin and said that the sun had risen thirty times, and he would go to the market once. Yang Pingwei replied.

"Thirty days, a month?" Li Kang muttered to himself, and suddenly laughed at himself: "I'm used to it, I forgot that this is not the earth." Hey, time is chaotic, there is no calendar, and people are confused. ”

"Don't say such frustrating words, my lord! It is precisely because the foundation is completely lost that we can start again. Nowadays, Xin'an Town is like a blank paper, which is the best stage for us to splash ink and excite words. Yang Pingwei didn't know what he was stimulated, and he was very emotional, "Innovation can lead to peace, lord!"

"Fude's words are like morning bells and dusk drums, deafening and deafening! It's that I want to be bad, if there is no Fude, there will be a few major mistakes. I would like to bow down to me!" Li Kang was very moved, he himself was exhausted by this endless lock, and unconsciously became tired, while the other party put infinite enthusiasm into it, not only for glory and wealth, but more for his own ideals. If it weren't for Yang Pingwei's yelling, if he continued, maybe one day Li Kang would have cowered and given up halfway. Therefore, he bowed this time, very sincerely, without pretentiousness.

Yang Pingwei didn't dare to stand there arrogantly, he hurriedly turned sideways and said, "The lord has tormented the students!"

Yang Pingwei, who calmed down, was both scared and moved, he couldn't believe that the person who yelled at Li Kang just now would be himself. However, Li Kang's reaction was even more unexpected, in the hearts of Confucian disciples, the concept of superiority and inferiority is very important. And it is rare for Li Kang, as the monarch, to be able to do this step. In an instant, Yang Pingwei put Li Kang and himself into the roles of Tang Taizong and Wei Zheng.

As a bystander, Feng Wenhan felt even deeper, and he was envious and admired Yang Pingwei, he knew that he would not dare to yell at Li Kang no matter what, this was determined by his background, he couldn't change it, he didn't want to change it, and it was impossible for a spy to be a minister. He only secretly deepened his determination to befriend Yang Pingwei.

After Li Kang cleaned up his emotions, he took out the ore he had kept last night from the drawer, including an energy block, a magnetite ore, a pegmatite, a cassiterite, a malachite, and a coal gangue.

"These are some of the stones you trade back that are directly or indirectly useful to us. Li Kang pointed to the energy block and said, "Especially this kind of ore is the most important thing to me, more than gold!"

"Shhhhh

The two of them are not stupid, they both know the effect of gold on Li Kang, but not because gold is valuable - for the current Xin'an Town, gold and silver treasures are not as good as a nest - it is a sacrifice to perform the 'immortal law', but now Li Kang says that this beautiful stone is more useful than gold?

"Fude, in the future, this kind of... It's called the Energy Block, and it's listed as the highest priority trading object along with gold. Li Kang thought for a moment and added, "In this way, if it is feasible, the grain will be directly linked to the energy block and gold, that is, if you want to exchange for food, you must exchange these two things, and we don't want anything else." ”

In the end, Li Kang said a little sloppily: "Of course, whether you want to do this or not, it's up to you Yang Pingwei to decide, I don't know the market, I'm only responsible for putting forward opinions." ”

"No!" Yang Pingwei didn't feel the trouble, but enjoyed it.

"Hehe, since Fude is full of energy, it couldn't be better. Li Kang smiled, then pointed to a few other stones and said: "The black ash is called coal gangue, which is an accessory product of the coal mine, and the green one is called malachite, which is a copper ore companion." There is no need to trade these two ores themselves, but you need to figure out to me where the natives got them. Do you understand?" As he spoke, he looked at Feng Wenhan: "This is mainly your task. Do you know my purpose?"

"My subordinates understand! I will find out the details of their associated mines. Feng Wenhan nodded in response.

"Well, that's good!" Li Kang smiled with satisfaction, "These two pieces, one is iron ore and the other is tin ore, both can be used as trading objects." In the same way, Feng Wenhan..."

"The subordinates know. ”

"This last one—" Li Kang looked at the pegmatite, and was a little undecided for a while. This thing is different from the gold-bearing limonite found earlier, it is not strictly speaking an ore, the composition is complex and inconsistent, and who knows if there is gold in other pegmatites.

After thinking about it, Li Kang said: "This kind of stone can be traded back in moderation. But for each piece traded, remember which tribe it was trading with. ”

"Students understand. Yang Pingwei nodded slightly, although he didn't know what was different about this stone and why he did it, but it didn't prevent him from doing what he was ordered.

"Well, you can take these pieces first!" Li Kang pushed the stone forward, sat down again, and said, "Have you decided when to leave next time?"

That's what the students think. According to the time law of their gathering, it is certainly not appropriate, for the natives, trading is just a life, and the importance is not high. But we are different, so we had better go diligently, serve more thoughtfully, and directly Yang and Feng glanced at each other, and then Yang Pingwei stood up and said, "So the students plan to rest in the town for a few days, and set off when the goods are ready." ”

"Okay, but you make a list of the goods you need to summon me as soon as possible. Li Kang commanded.

"No!"

"Let Shan Cheng and Qin Han not slack off, and work hard to cultivate. You should also pay more attention to your safety, so that those natives will not rob you of pink eye when the time comes. At the end, Li Kang smiled and instructed half-casually and half-seriously, "And you, Wen Han, you have to hurry up your training." ”

"Let's go down. ”

"I'll retire. ”