Ren Baqian sat on a chair and stared blankly. This place happened to be a cool place, and the temperature around it was the same as that of a fire.

According to the summer season, it is already late autumn now, but the weather is still so hot.

There was a jingling sound of excavation in the distance of Damo Mountain.

After burning the mountain yesterday, a crack as thin as hair appeared on the wall of the mountain, which made Gu Qiong and Tao Jiyuan both happy and felt that they had found a way to dig the Damo Mountain.

However, Ren Baqian is not as optimistic as them. It is probably just a little bit above the surface, and there should be no change inside.

Of course, this is also the different requirements of both sides. Ren Baqian is thinking of obtaining an iron ore that can build weapons equipped with an army of 20,000.

Dayao's standard thick-back long knife is not the kind of knives weighing three or two pounds that ordinary people hold. Each one weighs about twenty pounds, and the iron ore required is at least twenty 22 or three pounds.

Thousands of prisoners in Damo Mountain can only mine 180 kilograms of iron ore a day. They can only make four knives, and only more than two thousand in two years. All of them are used in the army, and it can still be said to be a drop in the bucket.

You should know that Da Yao is not just a weapon needed in an army, including hunters in the mountains, and the iron tools needed in daily life.

Although I didn't go to Liucui Mountain, another iron ore, Ren Baqian asked Tao Jiyuan during a chat before, because it was in the mountains and the mountain roads were difficult to move. Although mining was much easier, transportation was also a big problem.

What can a country with a population of 30 to 40 million and a population of only 10,000 or 20,000 kilograms per year do?

"Sir, sir, today's weight is at least four or five hundred kilograms, which is the amount mined in the past four or five days."

Ren Baqian didn't know when he fell asleep, but was awakened by Gu Qiong's loud voice in his sleep.

"Oh? Four or five hundred kilograms?" Ren Baqian rubbed his eyes, and ignited the fire for a day, then watered it, and mined it in one day, which was almost twice as much.

"Then pull more wood, it is best to mobilize some people in the surrounding cities to transport wood, and then burn the mountains separately. One day on the east side of the west side, take turns to burn the mountains to mine, so that the efficiency will be improved." Ren Baqian stretched and said, thinking in his heart that the surrounding mountains would become in a few years. After all, if you want to burn this iron mountain to mine, the wood consumed in a year is not a decimal point, but the growth of trees is ten years.

Moreover, as the surrounding wood decreases, if you want to maintain such a mining speed in the future, you need to send wood from a distance, so that the number of people will be used will be even larger. Let's do this first, and wait for yourself to go back to study the concave mirror.

"What Lord Ren said is." Tao Jiyuan immediately admired Ren's iron ore production by one or two days in a time of one or two. "But he may have to order his Majesty to do so."

"Go and have a look." Ren Baqian stood up and asked Gu Qiong to lead the way, and went to the foot of Damo Mountain to study and observe. As expected, as he thought before, it was just a thin layer, with the length of half a finger, which was about three centimeters.

"Dr. Tao, I'll ask you to give your Majesty a memorial and tell me what's going on here." Ren Baqian turned around and said.

During dinner, Tao Jiyuan and Gu Qiong had an excited expression on their faces. Ren Baqian did not disturb their enthusiasm, but said, "I will have a good rest tomorrow. Don't bother me if it's a big deal, and don't prepare food for me."

"Yes, Lord Ren."

After saying hello to them, Ren Baqian returned to the house and returned to Earth when everyone was about to go to bed.

...

It was evening on Earth at this time. Ren Baqian first turned on the computer to find the news he had seen before. He just entered the keyword and found it quickly, and it was more than one.

Someone conducted such an experiment 70 years ago, using a liquid mirror to make the first 50-kilowatt solar furnace, which can melt 1 cm of steel plate in thirty seconds.

A laboratory built 50 years ago was built with a ten thousand concave mirror, which can reach 1,000 kilowatt-hours and instantly reach a high temperature of 3,500 degrees at the target.

The melting point of iron only needs 1538 degrees, so it doesn't need that big, just a little smaller.

In a video online, a foreign guy used 5,800 small lenses the size of nails to put them on a satellite pot cover and melted the iron.

All these prove that Ren Baqian’s previous ideas were feasible.

It does not need to be as big as a foreign laboratory. It is enough to be one tenth of the size, and it can even be divided into ten parts and combined together. After all, it is just to melt the walls of Damama Mountain. There is no high requirement for accuracy in all aspects. As long as the focus is within one range, it is enough to ensure that the temperature within the range is sufficient.

That night, Ren Baqian contacted a physics professor from a university in the city through Chen Qing. He met him the next day and told him what he asked for, and needed a concave mirror to make a movable and adjustable solar furnace that could melt steel three or four hundred meters away.

The other party needs to provide him with a solar furnace that can be carried by a single person, as well as a series of solutions for him to make concave mirror molds and installation angles for all concave mirrors in Dayao in the future.

This is very troublesome for Ren Baqian, but for the other party, this matter is very simple. After all, Ren Baqian does not have high requirements for accuracy in all aspects, and can even be completed by throwing it to students, and the reward is 500,000.

After discussing this matter, Ren Baqian returned to Dayao after two days of rest.

...

Liucui Mountain is actually just outside the Sixty-Wan Dashan Mountain on the west side of Dayao, but it takes two days to reach the iron ore position. Moreover, the difficult mountain road is the biggest difficulty in transporting iron ore outward.

A few days after leaving Mount Damo, Ren Baqian walked on this mountain road.

It was fine when I first entered the mountain, but the mountain road was easy to walk. After all, people often pass this road.

However, a day passed, the mountain road began to wind and hard to walk. One side was the mountain wall and the other side was the mountain stream, and there was only a one-meter-wide road in the middle.

Although people can walk, mounts and other things are definitely not good.

Even if people can walk, they cannot get faster.

At least every time Ren Baqian glanced at the bottom of the cliff next to him, he felt dizzy.

You should know that there are two or three hundred meters below, and when it falls, it becomes a meat pie.

Ren Baqian suddenly realized that he had a big weakness, fearing high.

I didn't notice it before.

Seeing him like this, Fujiki was also worried and followed him closely, ready to pull him at any time.

If something happened to this person, he wouldn't have to go back.

After walking on this road for a long time, when he finally came to a valley with cliffs on all sides, Ren Baqian finally let go of his heart that had been holding and felt that he had come alive again.

The valley is not too big. In addition to the guards of more than 100 people, there are seven or eight hundred people who mine here.
Chapter completed!