Early the next morning, Lin Feng did not train with the team, and found Sun Cuo and Zhao Bin, who were still striking iron at the bottom of the valley.

At this time, the bottom of the valley has completely changed its appearance: several huge waterwheels stand by the pool, and the rushing water hits the huge wooden leaves. The Konoha rotates constantly, transmitting the force to the runner at the rear of the waterwheel, driving the iron-striking stones, the wind-blowing fan wheels, and the rolling conveyor belt. Next to the water wheel, Sun Cuo and Zhao Bin were busy with a few guys.

Lin Feng was attracted by the two big fan wheels and conveyor belts at a glance. The fan wheel is a bit like the fan of later generations, except that the outline is a square frame made of wood, and in the middle is a wooden three-bladed fan, which is constantly blowing air into the fire below the blast furnace; The conveyor belt is even more interesting, with wooden gears that rotate under the power of the water, driving an iron chain forward with small baskets full of charcoal from one side of the pile of coal to the blast furnace.

"Brother Sun, who did this?" Lin Feng immediately shouted loudly.

Sun Cuo, who had already seen Lin Feng, handed over the sledgehammer in his hand to an apprentice, patted Zhao Bin, who had been working with his head down, and turned around and walked over to Lin Feng.

"After so many days, you're finally back!" Sun Cuo wiped the sweat on his forehead with the back of his hand, pointed at Zhao Bin and said, "He came up with this!" ”

Zhao Bin stepped forward at this time and saluted with his fists and greeted Lin Feng.

"It's a great idea, it's smart!" Lin Feng praised sincerely, pointed to the two inventions and said, "The idea of this fan wheel is good, but the speed is not fast enough; Well, for the time being, it's called a conveyor belt, but I'm afraid it's easy to break! ”

Zhao Binjun blushed and nodded yes.

Lin Feng patted him on the shoulder and said loudly, "Actually, these two things can be improved through the same small change. ”

Lin Feng took a sharp piece of charcoal, drew the appearance of a gear in the afterlife, next to it, drew a pinion with a denser pitch, let the two of them bite, and then said: "If we make such two iron gears, one large and one small, so that the force is transferred from the big gear to the small gear, and the small gear is used to drive the rotating column on it, can we make the speed faster?" ”

Zhao Bin and Sun Cuo's eyes lit up at the same time, Zhao Bin patted his head and sighed loudly: "Why didn't I think of it?!" ”

As long as the rotation speed is up, you can use the high-speed rotation to cut, cut, planer and other actions, so as to make more objects and develop, which will be the origin of the original lathe! And what is a lathe? In the machining industry, it is the "mother machine" of all equipment.

As early as ancient times, lathes were mainly pulled by hand or foot, rotated the workpiece through ropes, and cut with tools in hand. It was not until 1797 that the British mechanical inventor Maudsley created a modern lathe with a lead screw to drive a tool holder, and in 1800 he adopted an exchange gear that could change the feed rate and the pitch of the thread being machined. Since then, the lathe has developed by leaps and bounds from semi-automatic to automatic and then to program-controlled.

Lin Feng smiled, and then drew an object with large and small gears closely connected together, and drew another small gear next to the small gear in it.

Zhao Bin immediately understood and shouted, "Can you drive two or more gears at the same time?" ”

"That's right!" Lin Feng sped up his hand and drew the coal conveyor belt he saw in the briquette factory in the later generations, and explained: "If you make two equal gears on the same iron shaft, and iron chains are set on both sides, and the connecting surfaces are fixed between the two chains, can you transport objects uninterrupted?" ”

"Lord Lin! What a genius you are! Zhao Bin stared at Lin Feng's eyes getting brighter and brighter, and suddenly shouted, and he was about to run in a blink of an eye.

Lin Feng grabbed him, and then explained: "Remember, if you dig out the holes in the pages of the iron gears, you can reduce the loss of force!" ”

Zhao Bin was stunned for a moment, then immediately came to his senses, gave Lin Feng a thumbs up, and rushed into the room next to him.

Sun Cuo patted Lin Feng on the shoulder fiercely, and said loudly: "All day long, your ghost ideas are always endless!" ”

Lin Feng deliberately pretended to be so painful that he bared his teeth, thumped Sun Cuo's bulging muscles, and counterattacked: "I don't have the brute strength of your eldest brother, so I can only think cranky!" ”

Sun Cuo Ha Lu Ha Da Lu smiled, pulled Lin Feng and walked towards the coal pile on Lu's right hand, turning the coal pile, it was a pile of iron ore.

Lin Feng was pleasantly surprised: "Big brother, have you already started mining iron ore?" ”

Sun Cuo said proudly: "Yesterday, I heard you say that you have made great achievements in the past few months, and your brother and I have not been idle, and a lot of iron mines have been mined through the water and fire method!" "The water-fire method, which was later called the hot and cold method, constantly stimulates the ore with alternating hot and cold water, and then excavates and mines it after it is loosened.

"Then the eldest brother has produced a lot of good weapons in the past few months, right?" Lin Feng also grinned happily.

"That is, it is not a problem to equip the existing personnel in the valley!" Sun Cuo proudly opened a room and showed Lin Feng the weapons piled up like a hill.

Lin Fengle was broken, and he ignored Sun Mistake, and immediately rushed to the front of the valley, excitedly stopped the group of soldiers who were training, divided a few people to the treasury to carry the money out, and the team of people and horses went straight to the back valley.

"One set of new weapons per person, line up to get it!" Lin Feng opened the door of the room and shouted at the somewhat inexplicable brother.

Now there are not many people in the valley who already have new weapons, especially the new soldiers, who have long coveted the good weapons that some people have, and immediately rushed up.

"Remember, each set of special weapons has the same number on it, this number will follow you for the rest of your life, the people are in the weapons, the weapons are gone, and you don't come to see me again!" Lin Feng roared angrily, and took advantage of the moment when these people were stunned to leave the door of the room.

All the soldiers immediately poured into the house and began to scramble for weapons.

"A bunch of bandits!" Sun Cuo, who was standing in the back, scolded hatefully, making Lin Feng next to him snicker.

After this group of "hooligans" finished snatching the weapons, Sun Cuo grabbed Lin Feng, who was leaving, mysteriously led him to another room, closed the door, and took out a locked box from the box.

Lin Feng watched with great interest as Sun Cuo played the treasure until he took out a sleeve arrow. This one was obviously different from the assassin sleeve arrow that Lin Feng had given him before, and he immediately snatched it up.

"You've invented a better Hidden Arrow?" Lin Feng asked in surprise, rummaging through his hand and checking it over and over again. It is a two-barreled sleeve arrow, two parallel steel pipes cast together, mounted on a palm-shaped holster, each with a semi-curved connecting rod on the outside.

Sun Cuo snatched it, buckled the holster to his wrist, adjusted the position, twisted it, and motioned for his fingers to curl up just enough to push the button at the top of the curved link, and then pointed his arm to the wall, and with a light press, two shiny sleeve arrows jumped out one after another, nailed deep into the wood.

"The spring you said is really difficult to get, thick and thin are not easy to get, I cast a lot of models to pour out sixteen that can be used, eight are ready to be used in the car, and the other eight got four sleeve arrows, only to find that the spring you said is very easy to use." Sun Cuo pulled the two steel arrows from the wood, reloaded them into the quiver, and then unloaded them and handed them to Lin Feng.

The function of the spring is also quoted by Lin Feng from later generations, the spring is loaded into the back of the steel cylinder, the arrow is loaded from the front, and after it is stuck, the spring will be naturally compressed, and then the arrow will be shot out with its elastic force.

Lin Feng excitedly picked up the four boxes at once, nodded to Sun Cuo, and rushed out of the door, causing Sun Cuo to scold loudly behind him: "I found that you are the biggest bandit!" ”

In the afternoon of the same day, Lin Feng took Wei San to leave the valley base in advance, and went directly back to the city and entered King Zheng's mansion, Lin Feng and Li Yu discussed for nearly two hours before returning to their own mansion.

Far away, Lin Feng was stunned, dozens of carriages had completely blocked the door of his house.