Before the sun set, Liu Zhi stopped in a place suitable for camping, and while everyone was making a fire and roasting meat, he went to dig a pile of clay and came back, first made a small pit in the ground, threw some small branches in it, lit a fire, and then surrounded it with long and thick clay, layered on top of each other, and soon made a circular earthen oven.

There is a hole with a diameter of more than ten centimeters left on the side of the earthen stove, which is exactly the same as the earthen pipe he made yesterday.

After dinner, Liu Zhi called Chen Da, tied three thick wooden sticks of similar length together, made a door-shaped, and dug a small hole 1 cm deep under the wooden stick at the "top of the door", and then took out the hemp rope in the bag and tied it to the front end of a branch, like a whip used to drive cattle and sheep when the earth was in the earth.

Then, Liu Zhi put the handle of the windmill out of the bottom of the earthen pot, the earthen pot is reversed, and the mouth of the pot is covered on the ground, and then the round earthen pipe is connected to the mouth of the earthen pot, and the earthen pipe is aimed at the hole on the earthen stove, so that as long as the handle of the windmill is constantly rubbed, the fan blades made of two pieces of bark in the earthen pot will rotate non-stop, and a large amount of wind will be conveyed, and the fire in the earthen furnace will be "blown" into the earthen furnace through the earthen pipe, so that the fire in the earthen furnace becomes very strong.

Chen Da was stunned on the side, and muttered, "Brother, are you a bellows?" ”

He had seen bellows in his rural hometown and knew a little bit of the principle.

Liu Zhi nodded: "Almost, I call it a bow blower." ”

Bow blowers? Chen Da whispered silently, and then asked, "What does the bow pose mean?" ”

Liu Zhi smiled, took the "door" composed of three wooden sticks, two doorposts were inserted on both sides of the earthen pot, and the windmill handle was just facing the small hole in the "door top", because he had put a small wooden board in the earthen pot, and a small hole was also chiseled in the middle of the wooden board, and the position of the top of the windmill was exactly this small hole, so the whole windmill was fixed between the two small holes in the top of the door and the wooden board, and would not move outward.

Then he picked up the whip he had just made, and the hemp rope went around the handle of the windmill, straightened the rope, and held it in his hand with the end of the stick, and slowly pulled it back and forth, and the handle of the windmill spun at high speed, and the flame in the earthen furnace continued to rise, and the temperature rose sharply.

Liu Zhi looked at Chen Da and explained by the way: "See, this is the so-called bow style, no matter I pull or push, the fan blades in it will rotate quickly, because the fan blades are straight, so the forward and reverse rotation will be out of the air, and the air flow will not be interrupted, so as to achieve an effect similar to that of a blower." ”

Seeing the flame in the earthen furnace continue to rise, Chen Da only felt an eye-opener, he heard his grandfather say that the traditional bellows can also achieve the effect of a blower, but to do this requires a very complex design, and Liu Zhi uses soil, branches, bark, straw rope and other raw materials to do it, it is really breathtaking.

"Well, brother, this thing is in your mouth, but what's the use?" Chen Da asked one last question.

"Hit a spear, the kind of spear that Zhao Yun used." After Liu Zhi finished speaking, he walked to the side and picked up the trunk of the Liufang Tree, and said to Chen Da: "Do you know how hard this tree is?" ”

"All I know is that it's hard." Chen Da said sullenly that he had heard about Liu Zhi killing the dog demon with a branch, and he also personally tested the weight of the branch, he could bench press 80 kg when he was in school, not counting the barbell bar, but even if he used the strength to feed, he couldn't lift the branch that was less than two meters long and no thicker than his arm, so it can be seen that its density must be frighteningly high.

"Let's just say that this tree is denser than platinum and harder than diamond." Liu Zhi said, laying the trunk flat on the earthen stove, and turned to Chen Dadao: "Go and help me pull the blower, just get it like I just did." ”

Chen Da sighed, sat next to the blower and kept pushing and pulling, and continued to ask, "So, do you want to make this tree trunk into a spear?" By the way, I remember that diamonds are the hardest substance on earth, is this tree really that hard? ”

Liu Zhi replied lazily: "Why am I lying to you, besides, diamonds are not the hardest substance on the earth, they are all hyped up by merchants, it is a marketing method, there are two kinds of minerals on the earth that are harder than diamonds in nature alone, and I don't know how many are synthetic." ”

Chen Da looked teachable, and then said: "Since this tree is so hard, I'm afraid it's useless to burn it." ”

"Ordinary fire is really useless, but with a blower it is different, it only takes about 800 degrees of fire temperature to burn the surface of this wood to a little carbon, the higher the temperature, the faster the efficiency." Liu Zhi explained.

"Isn't that going to burn for a long time?" Chen Dadao.

"Well, it takes about four to five days to burn out the barrel, and it takes about that long to polish the tip and handle, adding up to about ten days." Liu Zhidao, the low ignition point can be said to be the only disadvantage of the hexagonal wood, once you encounter a demon beast that can breathe fire or a special awakened person who can control fire, this weapon is easy to be damaged, and the repair cannot be implemented at all due to the limitation of materials, and it is time-consuming and laborious to transform and re-make, compared with some rare metals, it is indeed not a good weapon material.

…………

In the next three days, under the leadership of Liu Zhi, everyone hurried during the day and rested at night, and finally arrived at the camp in the mountain recess at noon on the fourth day.

At this time, the trees around the camp have been cut down, the stumps have also been uprooted and made into various tools, rows of wooden beds stretch out at the bottom of the cliff, up to more than 100 meters, the wooden bed is covered with straw mats, there are straw pillows, very few wooden beds are on top, and there is a neatly folded, washed and clean animal skin, at first glance it is the bed of the big man.

Around some of the beds, there are wooden tables and chairs, and there are stone tools and pots and pans on the table, some porcelain and some wood, most of which are wood.

About every ten beds, there is a large porcelain jar with a height and width of one meter, and a round wooden board covers the top of the jar.

In the open space to the left of the camp were nearly forty earthen stoves, where twenty or thirty men and women were busy at work, cooking utensils in addition to porcelain pots and steamers, as well as delicately polished stone pots, where everyone could smell the aroma of stir-fried vegetables and soups.

Looking out further, on the left and right sides of the camp, there are more than 20 neatly arranged cabins, about two meters high, about one meter five wide, with doors and roofs.

Thinking that they can live in such a place in the future, work every day, do not worry about food and housing, and even have the opportunity to become superhuman-like awakened, many people can't help but have red eyes, and very few people are sensitive, the tip of their noses twitched, and tears are pouring down.

Although Liu Zhi has revealed some of the situation in the camp, when he really sees such a pure land, many people still can't help but want to cry, this is a scene that only appears in dreams since they crossed over.