Lin Feng rushed to Sun Cuo's place and found that a few guys were still making weapons, and two guys were worrying about a pile of food. Curiously asked, only to find out that Sun Cuo's question was actually very simple, they couldn't eat hot meals.

Previously, Sun Cuo and a few people had been eating at Lin Feng's group. But in the process of burning the stove or making weapons, often at the critical moment when the meal is in progress, it is impossible to eat in batches, in the first few days, the chef is willing to give them hot rice, plus additional meals, but after a long time, they are not very happy, and their faces are put on a show. And Sun Cuo, a few "muscular men" who often pick up sledgehammers, no one is willing to go to the stove to cook hot rice, let alone cook.

Lin Feng understood the ins and outs of the matter, and suddenly laughed, he was about to tell Sun Cuo about this this time.

Lin Feng pulled Sun Cuo aside, didn't say anything in his mouth, still picked up a branch and quickly scratched it on the ground.

As soon as he finished the stroke, Lin Feng immediately explained the figures on the ground in turn: "Brother Sun, you first find a way to make a rectangular thin iron sheet, make a fold that can be buckled on both sides, and then wear three iron rods in the middle of the lower part of the rolled up iron cylinder and fix it on it. A thick cylinder made of clay is placed vertically in the middle of the cylinder and placed on the iron rod, and the perimeter of the cylinder is covered with mud fired from clay.

The bottom of the iron cylinder is also riveted with a thin round iron sheet, and the lower part of the iron rod is also roughly pasted with mud, but a passage must be left. The passage starts from directly below the iron rod to either side of the iron sheet, and then cuts out a circular hole in the corresponding position, how about it, is it clear? ”

"Your statement is very similar to a small stove, but it seems to be a little troublesome?" Sun Cuo scratched his head.

Lin Feng smiled and shook his head, what he drew out was the appearance of the briquette stove in later generations, and it was also borrowed from the small stove in ancient times. However, anyone can make a small red clay stove, but after standardized production, the briquette stove cannot be made casually.

Lin Feng smiled mysteriously and said to Sun Cuo: "This will be a new way for us to make money. Brother Sun, you're right to listen to me. One thing you must note here in advance is that the core in the middle must be fixed to the size, and thus the size of the briquettes and the size of the briquette machine. ”

"What are briquettes and briquette machines?" Sun Cuo began to scratch his head again.

"Let's say the same. This stove also needs to be equipped with a handle that can be carried on the top, a discus with a hole in the middle, a hook to lift the discus, and a stopper on the bottom, which are these figures on the ground. Lin Feng continued to point to the pattern on the ground.

Looking at Sun Cuo's somewhat confused eyes, Lin Feng smiled, patted him on the shoulder, pointed to a circular pattern on the ground and said, "It looks like a lot and it's difficult, but it's actually very simple." Let's talk about briquettes now. It is made of crushed coal mixed with soil, with permeable holes in the middle, each of which is fixed in thickness. It is advisable to put three pieces in one stove. ”

"Why do you want to mix it with soil?" Sun Cuo threw another question.

"Ha Luha, the main reason is that the simple use of coal is too much consumption, in addition, the mixing of soil can increase the viscosity and make the briquettes easier to form and not easy to disperse." Lin Feng explained.

"Oh, what about the briquette machine?" Sun Cuo nodded and continued to ask.

Lin Feng added a few more small details to the last two patterns, and then explained seriously: "Brother Sun, this is a bit complicated. The briquette machine is mainly divided into two parts, which are set together. Inside is an iron rod, and at the top is a discus, and on the cake are protruding thin iron pillars, which are made into holes in the briquettes, which should be as uniform in size and evenly distributed as possible.

The outer part should be a hollow tube, with a thin rod attached to the upper end for easy holding, and the lower end should be a middle cylinder, which should be just enough to fit the iron pillar ends at the front end of the previous stick together. ”

Sun Cuo grabbed a handful of hair hard, stared at the two figures, and scratched his hands for a long time before finally nodding and saying with some hesitation: "Okay, I'll try to make such a model." Doesn't that tube fall out, though? ”

"You can weld a thin iron plate at the top of the pipe to block it and prevent it from sliding down. You can wait until it's done, put it in a blast furnace and heat it, and then hammer it together. Lin Feng replied, his hands wanted to grab his hair, what was so easy in his previous life was as difficult as the sky here, and he had to seriously consider whether it was realized in this time and space before he stole it. This briquette machine is mainly because he helped his family play briquettes since he was a child in his previous life, and he was very impressed by these.

"Oh well. I'll give it a try. Sun Cuo carefully looked at the underground graphics twice more and memorized them in his mind.

Hearing Sun Cuo say the word "trial test" again, he smiled and comforted him and said: "Don't worry, when the national talent ceremony is held, I will try to discover a lot of talented people with design talents, and you will be very relaxed at that time." ”

"Good. I've never been afraid to fight swords, but I really struggle with these things. Brother, I sometimes wonder how your mind came up with so many new and useful things. Sun Cuo raised his head and looked at Lin Feng and said.

Lin Feng smiled and didn't answer, but asked, "By the way, what happened to those special weapons that I let fire earlier?" At this point, Lin Feng revealed the true purpose of this visit.

"I've made some samples separately and I'm thinking of showing them to you." Returning to the topic that Sun Cuo was good at, his mood was also a little higher, and he immediately ran into the house.

Lin Feng followed him into the house.

Sun Cuo pulled out a bamboo basket from under his bed, removed the things covering it, and brought it to the table.

The sawtooth dagger, the three-edged military thorn, and the one-foot hidden blade, Lin Feng picked up these weapons one by one, which were also crossed, and first waved them in his hand a few times, trying their size, and stabbing them the rough wooden table one by one to see how sharp they were.

After trying it, Lin Feng nodded with satisfaction. Although these weapons were not as refined as those of later generations, their effectiveness and sharpness were ahead of the curve in this era.

"Okay, Brother Sun is attentive. In the future, let's do the same thing, let's start with twenty pieces. Keep in mind, however, that each weapon must be numbered. Lin Feng said emphatically, taking a piece of paper and writing 1, 2, and 3 on it one by one...... 10 These ten numbers.

"That's what you call the number?" Sun Cuo looked at the numbers curiously.

"Here are some counting methods I learned from the monks, corresponding to our one, two, three to pick up these ten numbers." Lin Feng easily took the Arabic numerals that would have been introduced to China three or four hundred years later.

There has always been a misconception here. Arabic numerals originated in India, but they were transmitted to all corners by the Arabs, which is why it was later misunderstood that Arabic numerals were invented by the Arabs.

Around 500 AD, with the rise and development of economy, culture, and Buddhism, the Punjab region in the northwestern part of the Indian subcontinent was at the forefront of mathematics. The oldest counts are probably up to 3, and the "0" and the numbers that follow them all appear much later. Around 700 years ago, the Arab Empire, which was thriving at the time, conquered the Punjab region of India, discovered these numbers and absorbed them. The oldest surviving engraving of the zero symbol in India from the 8th century, when it was called zero.

Later, the Arabs introduced this figure to Spain. In the 10th century, by Pope Gerbert? Auriac channeled the transmission to the rest of Europe. Around 1200 AD, European scholars formally adopted these symbols and systems. By the thirteenth century, at the initiative of the mathematician Fivalnaci in Pisa, Italy, ordinary Europeans also began to adopt Arabic numerals. Of course, the shape of Arabic numerals at that time was not exactly the same as modern Arabic numerals, but they were relatively close, and they gradually became what they are now.

In the thirteenth to fourteenth centuries, Arabic numerals were introduced into China, but because there was a number called "chips" in ancient China, it was more convenient to write, so Arabic numerals were not popularized and used in China in time at that time. It was not until the beginning of the twentieth century that Arabic numerals began to be slowly used in our country.

Now, Lin Feng has already been psychologically tempered into steel for learning from the good things of later generations, and he is even a little upright and impatient. In his view, as long as it is beneficial to this era and to the development of the Chinese nation, it is better to borrow than not to borrow, and it is better to borrow early than to borrow late!