"Call it a day, go home for dinner!"

With Su Yan's voice, the clansmen scattered around the smelting area gathered over, and everyone formed a scattered team and walked towards the Dragon Tribe's residence, directly approaching the road and diagonally through the planting area.

From a distance, there were puffs of smoke wafting from the dragon tribe's residence, and looking at the smoke, it seemed that you could still feel the smell of dinner, and unconsciously, the speed of the team was speeding up a lot, and they wanted to rush back to eat early.

Approaching the house, Su Yan saw the two sisters Xiaohua Xiaoyue busy in front of the stove.

"My brother is back, what is my brother holding in his hand?" Xiao Yue, who was standing outside, saw Su Yan returning and greeted him, in the remaining sunlight, the copper ruler in Su Yan's hand reflected the light of metal, and Xiao Yue curiously asked Su Yan about the copper ruler he was holding in his hand.

"It's a copper ruler, uh, I can't explain it, here you go, show it for yourself." Su Yan handed the bronze ruler to Xiao Yue.

"Oops, it's so heavy."

After Xiao Yue took the copper ruler, she almost dropped the copper ruler to the ground, not that the copper ruler was too heavy, but that Xiao Yue saw that the size of the copper ruler was not large, and thought that the weight of the copper ruler would not be too heavy, so she used the strength she thought could catch the copper ruler to take the copper ruler, but she didn't know the same volume of stone and coarse copper, and the weight of coarse copper was several times that of stone.

Xiao Yue looked at the copper ruler curiously, unable to imagine that the distance between something of such a large volume would be so heavy.

Su Yan thought about it in his mind and organized the language before explaining to Xiao Yue: "This is a copper ruler, made of copper, copper is metal, copper and stone of the same size, copper weighs several times more than stone, copper is harder than stone......"

Dinner is almost ready, Xiaohua turned her little head to listen to Su Yan's explanation, in the dragon tribe, Su Yan is the most knowledgeable person, followed by Xiaohua and Xiaoyue, Xiaohua and Xiaoyue are still learning, Su Yan will teach some knowledge to Xiaohua Xiaoyue from time to time.

"Copper is so good, the tribe must smelt more copper in the future to make our tribe stronger." Xiao Yue said seriously after listening to Su Yan's explanation.

This is a sense of belonging to the dragon tribe, and I hope that the tribe will become stronger, but the main reason is that "the tribe is the tribe of my brother".

Su Yan replied with a smile: "That's for sure, okay, let's have dinner, we're all hungry." ”

Dinner is peppered broth and grilled fish, some tired of eating, but you can still eat, in the primitive era to eat a full meal is the happiest thing, how can you still think about the problem of eating tired or not.

In other primitive tribes, even if the food is unpalatable, it is necessary to eat the unpalatable food in order to fill the stomach.

It is expected that the snake tribe will also feel that the fish is unpalatable when they try to eat it for the first time, and they will get used to it while eating.

Nothing was said all night.

The next day, after breakfast, Su Yan gave the copper ruler to a clansman with a disabled leg, and his main daily labor was to polish stone tools, and Su Yan gave him the task of polishing the copper ruler.

"You polish the side of the brass ruler flat."

"I see, king." Although he has a leg disability, he did not give up lightly and still worked hard to contribute to the tribe.

Today is the fourth time that Yuan has taken Team B to the copper mining area, and two more times, Zhi will take Team A back to take turns to rest.

Su Yan gathered the team to prepare to go to the smelting area, today Biao couldn't go out hunting, so he had to go to the smelting area with Su Yan's team, Biao was very interested in the metal weapons that Su Yan said, but the metal weapons have not been cast to disappoint Biao.

Coming to the smelting area, Su Yan divided all the team members into seven squads of varying numbers, three of which used three brick kilns to burn charcoal, and there were piles of cut wood not far away.

Biao and a team of people were sent by Su Yan to cut down trees, and there was still a part of the smelting area that had not been cleared and needed to be cleaned up.

A team collects materials to build a simple house, this house is not used for people to live, but for placing charcoal, once it rains, the charcoal will be wet by the rain, and the next day after the rain stops, the earth blast furnace will start smelting normally, but the charcoal soaked by the rain can not be used, so it is necessary to build a few simple houses that can keep out the rain to place charcoal.

The remaining two squads, one team went to collect clay to prepare for tomorrow's casting mold, and the last team came to the earthen blast furnace to prepare to use the earth blast furnace to smelt copper ore.

The slag and ash in the earthen blast furnace before leaving the smelting area yesterday evening have been cleaned up by the tribesmen, and now the earthen blast furnace can be used directly, Su Yan commanded the tribesmen to pour charcoal and copper ore into the earthen blast furnace, and then began to burn the copper ore on the burning charcoal.

The clay mould made yesterday was placed horizontally about a foot away from the clay blast furnace, just waiting for the hot copper to come out of the oven and pour it on top of the mould.

With yesterday's experience in smelting copper ore, there is no need for Su Yan to interfere too much today, stand aside and watch, and wait for problems to arise before they can be solved.

Su Yan didn't keep looking, and about half an hour later, the team responsible for making molds out of clay moved a few cuboid clay blocks, and then Su Yan needed to do it himself.

After thinking about it for a while, Su Yan had already decided to cast those tools tomorrow, scissors, kitchen knives (copper plates), copper shovels (pointed copper plates, with a guard in the middle of the ends), and pickaxes (also called hoes, slightly thicker rectangular copper plates, with a circular area at the end to be used to stuff wooden sticks).

Among them, the casting mold of scissors is the most difficult to make, in the process of making scissors casting mold, Su Yan made several mistakes in a row, but fortunately, the casting mold made of clay is easy to repair, and finally the casting mold of scissors was made after many mistakes.

There are many kinds of materials for casting molds in modern times, and there are about three kinds of casting materials that the dragon tribe can choose from, namely clay, pottery, and blister copper.

The casting mold made of blister copper is the strongest and can be reused many times, so there is no need to worry about the mold being damaged; Clay molds are of the worst quality and can be damaged after a single use.

When it comes to the difficulty of making casting molds, it is naturally the easiest and most convenient to make clay casting molds, and the most difficult to make coarse copper casting molds.

Pottery casting is somewhere in between.

The clay casting mold will be damaged once used, even if the blister copper is produced in large quantities, Su Yan will still choose clay to make the casting mold for a long time, after all, the clay casting mold is very simple to make, especially when a bronze tool is made, the next time you make the casting mold of this bronze tool, you can directly press the bronze tool on the clay block, and after the tool is taken out, it will leave the same space as the tool, and a casting mold will be quickly made.

Probably after that, Su Yan will cast one or two metal tools that can be used, and then cast the metal tools needed in large quantities.

Perhaps there will be metal casting molds in the future, and it is better to use clay casting molds for now.