Out of the copper.

After accumulating some copper juice in the pottery bowl, Su Yan took the pottery bowl to the place where the casting mold was placed, the pottery bowl was slightly tilted, and the copper juice was slowly poured on the casting mold.

First the axe, then the saw, and finally the nails of different sizes.

After no more copper juice flowed out of the earthen blast furnace, Su Yan took a pottery bowl and poured the last bit of copper juice on the nail casting mold.

Although Su Yan was very careful, he inevitably made mistakes, and accidentally poured too much copper juice or deviated from it.

After using up all the copper juice, Su Yan glanced at the pottery bowl, and thought about whether he should change the pottery bowl, or make a special thick-walled pottery bowl, and the pottery bowl should be concave in one place, so that the liquid in the pottery bowl could be poured out accurately.

Halfway through the afternoon, the tribesmen had already cleaned the inside of the earthen blast furnace where the temperature had dropped, and the temperature of the blank in the casting mold had also cooled, and Su Yan pulled the axe, saw, and nail out of the mold in turn.

The weight of the axe and the saw is about a catty, the density of pure copper is 8.9 (g/cm3), the blister copper is calculated according to 8 (g/cm3), a catty of blister copper is more than 60 cubic centimeters, only a pound of axe seems a little petite, the saw is okay, the thickness is about five millimeters, and the length is more than 40 centimeters.

All the nails weigh a pound in total, and the nails vary in size, ranging in length from one centimeter to five centimeters, and the diameter varies between a few millimeters.

However, now axes, saws, and nails can only be called blanks, and axes and saws need to be sharpened, and only nails can barely be used.

The side facing upwards when the axe, saw, and nail lying in the casting mold is the most unacceptable to Su Yan, this side is mostly uneven, and it will look very uncomfortable, even if this side is uneven and does not affect the use, Su Yan has to let the clansmen smooth this side.

The other five squads were still busy, and it was expected to end in the evening, so Su Yan asked the smelting team to also go to the jungle to help clear the vegetation, and only took the six members of the mold casting team to the dragon tribe's residence.

After returning to live, Su Yan first went to the tribesman with a disabled leg to take a look, the uneven side of the copper ruler is being smoothed, and it is expected that it will be completely smoothed out tomorrow afternoon.

Choosing an open space to sit on the ground, the six tribesmen brought over some stone tools with a mess of shapes, and then used them to polish the bronze tools.

Su Yan divided two axes, two saws, and a pile of nails among the six clansmen and said to them, "They have this uneven side, and the first thing you have to do is to polish and smooth this uneven side." ”

Hearing Su Yan's words, the six clansmen each looked for suitable stone tools, and began to polish the bronze tools in their hands with stone tools.

Most of the stone tools are rough, but the roughness is different, choose the stone tools with a finer surface, rub against the uneven side of the bronze tools, and polish them finely.

Before the appearance of pottery, people have been using stone tools, not always be able to find the stone tools they want, at this time they need to use a stone to slowly polish out, the work of polishing has always been done by male tribesmen, such as polishing stone spears, stone axes, stone knives and so on.

Later, the pottery was fired by Su Yan, and the status of stone tools in the Dragon Tribe did not decline too much, the firing technology of pottery was still relatively poor, and the hardness of pottery and stone could not be compared, so in the Dragon Tribe, pottery was mainly used as a container, and work such as cutting meat was still carried out with stone knives.

Now it's just a matter of changing from polishing stone tools to polishing bronze tools, the hardness of copper tools is higher than that of stones, and it takes more time to polish the bronze tools carefully, and Su Yan does not need to worry about the people breaking the bronze tools.

The clansmen were polishing the bronze utensils, and Su Yan was holding a branch to write and draw on the ground, stopping for a while to hold his chin with his hand and pondering, and then holding the branch to write and draw, repeating this process.

Su Yan is conceiving the idea of making bellows.

Su Yan's memory has the appearance of the bellows, the bellows are composed of a wooden box, a wooden handle and a movable wooden box, I don't know the internal structure of the bellows, but I see how the bellows work, as long as you push and pull, the bellows can blow out the air, to be precise, the bellows will blow out the air in the process of pushing and pulling, maybe there is still it in some remote villages in China in the 21st century.

Su Yan first sketched the shape of the bellows, the square wooden box, a handle that pushes and pulls back and forth, the air intakes on both sides of the wooden box, and the air outlets on the sides of the bellows.

When the handle is pushed forward, the air intake at the front of the wooden box will close, and the air intake at the back will open; When the handle is pulled back, the air intake at the front of the wooden box will open and the air intake at the back will close.

It's an amazing design.

The ancient people were able to make such a magical bellows, but now Su Yan was stumped, and the clumsy designers were modifying their drawings again and again, trying to outline the structure of the bellows.

In the evening, Su Yan still did not sketch the design of the bellows, called it a day, and prepared to go home for dinner.

Just as dinner was about to be eaten, Team B returned with copper ore on his back, which was temporarily placed in the corner of the residence and sent to the smelting area tomorrow.

This time, the total weight of the copper ore carried back by Team B is about 8,000 catties, in fact, Team A has dug out more than 10,000 catties of copper ore in the past two days, but Team B can't carry all the copper ore back, and the weight of the clansmen will reduce the speed of travel, and it is enough to transport 8,000 catties of copper ore at a time.

Anyway, the smelting area currently only smelts more than 200 catties of copper ore a day, and it is not known how long it will take to reach the capacity of smelting 4,000 catties of copper ore a day.

On the first day of smelting, a copper ruler was cast.

On the second day of smelting, axes, saws, and nails are cast.

On the third day of smelting, scissors, kitchen knives, copper shovels, and pickaxes are cast.

On the fourth day of smelting, sickles, nail rakes, and copper hammers were cast.

On the fifth day of smelting, the ...... is cast

Every day, the types of metal tools in the Dragon Tribe will increase, and Su Yan will take out all the tools that he can think of and can easily cast, and only cast one or two pieces first, and then cast them in batches.

On the fourth day of smelting, the construction of two more earthen blast furnaces began, and the new earthen blast furnace was about the same size as the first one, with only a few minor modifications.

Higher and larger earth blast furnaces will not be built for the time being, and higher and larger earth blast furnaces can no longer be used to smelt copper ore using artificial fans to add air to the earth blast furnaces, and higher efficiency bellows must be used.