There is also a seventh plank, which is slightly processed and reduced in size.

After the size of the seventh wooden board is reduced, it is placed perpendicular to the bottom surface in the wooden box, so that the internal space of the wooden box is divided into two parts, one left and one right, one space is large and the other space is small.

Looking at the structure in the wooden box, Su Yan fell into thinking: there is an air inlet at the front and back of this large space, a flap is set at the air inlet, and the air outlet is placed on the side of the small space, so that the bellows can continue to blow air from the air outlet in the back and forth push and pull?

"Trapdoor, back door...... Pregnant. ”

Su Yan's eyes lit up, and he thought of how to design it to make the bellows, which should be set up on the wooden board in the middle close to the front and back, respectively, the side front door and the side back door.

When the bellows is pushed forward, the back door opens, the front door closes, the side front door opens, and the side rear door closes, and the air in the large space will flow into the small space and finally be discharged from the air outlet.

When the bellows is pulled back, the rear door is closed, the front door is opened, the side front door is closed, and the side rear door is opened, and the air in the large space will continue to flow into the small space and finally be discharged from the air outlet.

Pull back the push-pull bellows, the process will be repeated, and the air outlet will continue to be exhausted.

After figuring out the structure of the bellows, Su Yan immediately started to modify the small bellows in front of him, and all kinds of tools came on the field, and half a day later, a semi-finished small bellows came out, among them, the four flaps of the small bellows were made of linen and small wooden chips.

Fixing the small bellows, Su Yan reached out and carefully pulled the handle of the bellows, a little hard, but still pulled, the side air outlet spit out some space, and when the handle was pushed forward, the air outlet continued to spit out air.

It worked!

Su Yan smiled with joy, and a sense of accomplishment arose.

After being busy for so long, he finally made the bellows, and with the bellows, Su Yan could design and build a taller and larger earth blast furnace, and the dragon tribe's copper smelting ability would also improve rapidly.

The sense of accomplishment comes and goes quickly, after all, this is the crystallization of the wisdom of the predecessors, Su Yan just copied it, and the small bellows made now are just a semi-finished product, and it will take a little time to make a bellows that can be put into use.

In order to smooth the surface of the planks used to make the bellows, Su Yan made the planer after several attempts;

In order to make the wooden planks of the bellows more solid, Su Yan tried to boil fish maw glue with fish maw bladder, which is actually the main adhesive material for folk hardwood furniture.

In order to make the rectangular splint that is connected to the handle as a piston move back and forth in the bellows, Su Yan tried to use hemp rope to tightly tie a circle of chicken feathers around the rectangular plywood, and the soft chicken feathers did not affect the push and pull of the "bellows fan", but also played a role in sealing.

Half a month has passed, and Su Yan has made an enlarged version of the finished bellows, and an adult can easily push and pull the bellows back and forth.

Coming to the smelting area with the bellows, the clansmen looked at the bellows brought by Su Yan curiously, not knowing what it was.

"Go get some adobe bricks." Su Yan said to a clansman that the next step was to try to use the bellows to deliver air to the earth blast furnace.

Put the bellows on the ground, the air outlet of the bellows is lower than the air inlet of the earth blast furnace, and there are several adobe bricks under the bellows, and the air outlet of the bellows is parallel to the air inlet of the earth blast furnace.

Su Yan deliberately protruded a little from the outlet of the bellows, but now it seems that it is still not enough, and the bellows are already close to the earth blast furnace.

Leave this issue aside for now.

"You two hold it." Su Yan said to the two clansmen beside him, asking the two of them to hold down the bellows.

After the two clansmen held down the bellows, Su Yan began to push and pull the handle of the bellows, and under Su Yan's push and pull, a large amount of air was blown into the earthen blast furnace from the bellows outlet.

"You come, follow my movements, push, pull, you try." Su Yan called another clansman to come over, he showed him first, and then gave him the position, the clansman imitated Su Yan's action just now, first slowly pushing and pulling the handle of the bellows, and then speeding up little by little.

Su Yan turned to look at the earthen blast furnace, and along an opening in the earthen blast furnace, Su Yan could see the flames in the earthen blast furnace blazing, and as the bellows pushed and pulled back and forth, the flames became more and more vigorous.

"Not bad." Su Yan nodded with satisfaction, the bellows really have an effect, only that one problem still needs to be solved, the bellows are too close to the earth blast furnace, the temperature of the earth blast furnace is too high, under the high temperature scorching, the bellows are easy to dry out, and it is best to have the bellows at a certain distance from the earth blast furnace.

It is not difficult to solve this problem, a copper pipe can be cast, and the copper pipe is used to connect the air outlet of the bellows and the air inlet of the earth blast furnace.

In the next three days, Su Yan led the five clansmen to make two more bellows, which can be regarded as teaching them the production techniques of the bellows for the five of them, and the five of them will be full-time carpenters of the Dragon Tribe in the future.

The three bellows are respectively configured for three earthen blast furnaces, originally an earthen blast furnace needs three clansmen to fan the air at the air intake, but now only one person needs to blow air with the bellows, in addition, the copper pipes that Su Yan needs are also cast out of three, and the copper pipes are used to connect the bellows and the earth blast furnace, so there is no need to worry about the bellows will dry out in a short time.

Half of the summer has passed, and Su Yan does not plan to build a new earth blast furnace this year, and will wait until next spring to build a new earth blast furnace, and Su Yan will also take the time to design a new earth blast furnace, which can smelt more blister copper at one time.

The bellows matter came to an end for the time being, and Su Yan didn't have time to rest and relax, so he threw himself into the next task.

100 acres of millet will be harvested in autumn, last year an acre of land produced 70 catties of millet, this year's planting millet seeds have been optimized, it is expected that the yield per mu will be increased to a certain extent during the autumn harvest, the yield per mu may reach more than 80 catties, and 100 acres of land is 8,000 catties.

This year, the area of the wasteland area is more than 1,800 mu, and together with the 700 mu here, the area that can be cultivated next year will reach 2,500 mu, the 700 mu of land outside the residential area will be used to grow hemp, and the 1,800 mu of land farther away will be used to grow millet.

8,000 catties of millet is preferentially selected for 1,800 catties of seeds, only one catty of seeds is needed for one acre of land, the particles of millet are so small, one acre of land does not use too many seeds, and the rest of the millet can be used to eat.

"I was finally able to eat millet porridge." When Su Yan endured the harvest of more than 100 catties of millet last year, how much millet was harvested this year, and it was finally ready to eat, but before eating millet, the husk of millet had to be removed.

Removing the husk of the millet can be said to be a very simple step, but it is very uncomfortable to do, holding a wooden stick in both hands and constantly pounding the rice to remove the husk of the millet, which is a very tiring manual labor, Su Yan thought about replacing these manual labor with hydraulic machinery.

In the future, the cultivation scale of millet in the dragon tribe will increase year after year, and the use of hydraulic machinery to hull the millet can reduce a lot of manpower input. ()

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