David said embarrassedly and stopped the test shot.

When everyone fell silent, Duozu slowly said in the card control language: "Yours this... Guns (English)? I'll keep it for me. ”

Muma on the side silently picked up the wooden box on the ground, took the pistol from David's hand and put it in the box, covered it and handed it to Duozu, turned his head and said to David in English: "Duozu, don't believe us." ”

David smiled wryly and said, "Isn't this nonsense, have you ever seen a prison where prison guards don't have guns but prisoners have prisons in our movies and television?" ”

Muma then said to David in English, "Weiwei, are you going to build my gun?" After speaking, he translated the meaning to Duozu.

Seeing that David looked at the sea in the distance and did not speak, Duozu said in the card control language: "No, first build what I can use... Gun. ”

Muma said to David in English, "What the patriarch means is to build a spear that he can use first, but look at his claws and body..."

David looked back at Duozu's body and said, "Duozu's body shape is not the same as our primates, but his limbs and claws are also very flexible, and it should be no problem to operate a specially designed firearm, I'll try it." To make a gun, you need to make steel first, and you can't use iron alone. Then there was the creation of generators and small motors to make grinding wheels and drill rigs, so that guns could be easily produced. With electricity, it is also possible to build and use electric furnaces to make steel, which is a hundred times more high-quality and efficient than steelmaking with carbon fire, and it is also convenient to manufacture more things. After all, electricity is one of the industrial bases. ”

Muma said: "Although I still don't understand, it's still the same as before, we all listen to you, just command." ”

David said: "To make generators and motors, we have iron and copper, and we need magnets, and although natural magnets can be found in iron ore, they are not suitable for modern generators and motors. I think it's better to make a NdFeB magnet in one step, although the research and development time may be very long, but it can also delay the time. The main raw materials for the production of NdFeB magnets are rare earth metal neodymium, rare earth metal praseodymium, pure iron, aluminum, boron iron alloy and other rare earth raw materials. There are no rare earths suitable for metallurgy on this island, and we are going to the continent of Eden to build a concentrator in the mining area, and then transport the rare earth concentrate back after getting it. So we now manufacture the steel parts of the beneficiation equipment, transport them to the mining area, and find a place near the river to install them, so that we can have a water wheel to drive the beneficiation equipment, who makes us have no motor now. And it's better to be by the river. ”

Muma said, "I didn't understand the others, but why delayed time?" ”

David glanced at Zhuoya, who had unknowingly grown to more than fifty centimeters long in the air flying on the side, and said, "I'll know when the time comes." ”

Duozu shook his tentacles quickly at this time, and said in the card control language: "Okay, okay, you don't keep speaking English and don't translate to me, what do you want to do and prepare quickly." ”

Muma nodded, glanced at Zoya quickly, and didn't say anything more.

Next, David instructed the slaves to make steel, and then made the steel wire mesh needed for mineral processing, a conical ball mill that could be driven by a water wheel, and other equipment accessories.

During this period, he also flew to a large iron mine in a small mountain range formed by a volcano on the eastern coast of the Eden continent with Duozu, found a huge natural magnet, and transported it to a large river near the rare earth ore mining area planned to be mined, ready to be used to make a rare earth magnetic separator.

In the west of the central part of the Eden continent, there is an area of about 5 million square kilometers, across the north and south of the continent, the karst landform area of different widths and narrows, named the Hodkingkaster landform area.

David remembers that in the southern coastal zone of the Hodkingcaster landscape, there was an open-pit rare earth mine, which was rich in minerals such as NdFeB and was not included in the 10-year mining plan of the human advance army.

Because at the junction of the eastern region of the Origin Plains, which is closer to the human base, and the Hodkingkaster landform area, there is a better rare earth mine, enough for humans to mine for decades.

After some basic equipment was ready, David and Muma rode Duozu, and then Duozu carried most of the equipment and flew to the rare earth open-pit mine named after David.

After putting the preliminary equipment in place, the two monkeys and one dragon flew back to Shenxue Island, taking away the twenty slaves and the remaining equipment, and the cave was handed over to Zhuoya to take care of.

The place David chose was by a river deep in a dense forest, so the beneficiation equipment could be hidden in the shade of a tree.

It took more than three Earth Months for the David Rare Earth Mine to finally produce enough rare earth concentrate, and after hiding all kinds of equipment and beneficiation traces, the two monkeys and one dragon first transported the slaves back to Shenxue Island, and then transported the rare earth concentrate back in batches.

The next step was refining, and David decided to use pyrometallurgy, which was a simple process and high productivity.

Rare earth pyrometallurgy mainly includes silicon thermal reduction method to produce rare earth alloys, molten salt pyrolysis method to produce rare earth metals or alloys, metal thermal reduction method to produce rare earth alloys, etc. The common feature of pyrometallurgy is that it is produced at high temperatures, so it can be implemented with large furnaces.

After more than a month of earth, David stood in front of a generator with a diameter of more than one meter behind the waterfall, and his face was full of excitement and broke the starting gate.

With the rotation of the large wooden waterwheel, the generator shaft begins to rotate rapidly through the steel gear and transmission shaft between the waterwheel and the generator.

Two long rubber-clad copper wires carry electrical energy into the third wooden house deep in the cave, where a small motor on a yellow wooden table begins to "whine", and the belt on the motor shaft rotates rapidly, driving a flat circular grinding wheel to rotate rapidly.

David rushed back to his lab and looked at the grinding wheel on the table, tears of excitement.

Zhuoya and Duozu looked up and down on the side with novel eyes.

Further out, Ava and several of the slaves who were the leaders of the group looked at the magically rotating motors and grinding wheels on their own, and they would never have imagined that this puzzling scene would be enough to go down in the history of Proxima Centauri B.

Muma, on the other hand, stood outside the house, through the open wooden window, watched Zhuoya, who had grown to more than a meter long, hovering above the motor and grinding wheel, and nodded to himself.

Next, David instructed Muma to make several electric drills suitable for Senka's use, as well as a large number of drill bits, which were directly embedded in diamonds of different sizes at the top.

After having a grinding wheel and an electric drill, David instructed the slaves to smelt all kinds of stainless steel blanks according to their own ideas, and then instructed Muma and other Senka to use grinding wheels and electric drills to finely polish and cut various parts, including barrels drilled from long fixed drill pipes.