Jiang Tian's call, the whole Academy of Sciences collectively became excited, all those who are interested in dedicating themselves to the cause of science are full of energy and waiting to be selected, but unfortunately not too many people are used this time, but Song Yi has already released his words, this time it is just a front stop, and the real large-scale experiment will be carried out later.

Even after streamlining and streamlining, when Jiang Tian came to the workshop in the suburbs, he was still startled by a large group of people: "These are the researchers you found?" ”

Song Yi nodded and said: "There is a specialization in the art industry, and if there are more people, you may be able to use it." ”

Jiang Tian turned around and asked Zhao Zhi to put down his luggage, and then asked him to return to the city with the carriage: "Okay, anyway, I have to eat and live here these days, maybe it can be faster if there are more people." ”

In fact, the first task given by Jiang Tian was not complicated, and it could even be said to be quite simple, because he took out a few patterns, and then asked the craftsmen to mint a batch of new copper coins according to the recipe of the Ming Dynasty.

"This money is ......" Song Yi looked at it over and over for a long time: "Could it be that we want to try to make new money?" But this inscription is a bit confusing. ”

"This is not the money we use, but the pattern coins that the Wa Kingdom commissioned me to mint, in addition to the coins of one, two, five and ten wen, there are also half taels and one tael of silver." Jiang Tian took out another piece of paper and handed it to Song Yi: "Just minting coins doesn't need to mobilize the people, the main thing is that we will also mint new coins next year, and this is what you have to do." ”

Song Yi just glanced at the piece of paper a few times, his eyes immediately lit up, he knew that he had guessed correctly, as long as Jiang Tian personally came out, there must be no trivial matter: "The student understands, let people set up a shelf first, if there is still a shortage, I will immediately replenish the manpower." ”

Jiang Tian nodded, after several words and deeds, now Song Yi can fully understand Jiang Tian's style of acting, and he also has rich experience to take over this huge national-level experiment, and I am afraid that the second person does not even know how to carry out the first step. As a result, that night, dozens of fast horses went out of the city overnight with the warrants of the Nine Gates, and they headed all the way south to the dust.

During the preparation period, Jiang Tian was not without nothing to do, although the Japanese commissioned him to mint some pattern coins, but did not explain the specifications and shapes of these coins, Jiang Tian drew some sketches on his own initiative and handed them to the craftsman, he felt that since he wanted to do it, he must show the technical strength of China, and the casting technology of small Japan was better than that of the nomads in this era, but when he began to communicate with the world, all kinds of technologies could not be locked even if you wanted to block the Central Plains. Just like in later generations, the United States and Japan joined forces to impose a technology embargo on us, but instead gave birth to a world factory. The key is how to show the level of China without being lightly plagiarized?

Facing a group of researchers and craftsmen, Jiang Tian explained the essentials of this time: "Our previous copper coins were all added to the copper with zinc, lead and tin, which can not actually be regarded as pure copper, but a copper-zinc alloy, which is commonly known as brass. The advantage is that the color is golden and the softness is moderate, and the disadvantage is that the formula is complex, and it is difficult to grasp the right proportion. ”

To put it bluntly, after a long period of use, ordinary coins no longer have the same weight as before, but because the price of copper in the Central Plains remains high, even if it is worn out, it still has a high currency value. But in the future, it may not be, Japan's copper mountain that stretches for 800 miles will soon become the Central Plains materials, the price of copper will definitely have a large rise and fall, and the copper coins with great circulation in the previous dynasties will gradually depreciate, not to mention that in many cases because of the country's financial problems, the copper content of copper coins is not consistent, and there are two kinds of bronze and brass. In order to maintain financial stability, the country needs to reform the monetary system as soon as possible, otherwise Jiang Tian would not be so attentive to staring, he is using Japanese money to make a real thing first, and if it succeeds, it can be used in the upcoming financial reform.

After explaining clearly to the craftsmen, these old workers with extraordinary craftsmanship began their work in an orderly manner, first of all, they used the lost wax method to make a wax model and then turned the sand casting, and then used it in the manufacture of batch molds after molding, and finally it was mass production.

"Sir, why did you remove lead and tin from copper, but increase the amount of zinc?" Song Yi pondered the formula for a long time, and couldn't understand why he denied the copper coin ingredients that had been fixed.

"Because it's not necessary!" Jiang Tian said succinctly: "Mixing copper with tin can get bronze, mixing with zinc to get brass, adding so many messy things, although the performance is good, there is no need for this at all." Now increase the ratio of copper to zinc to seven to three, let's call it seven three brass, its hardness and toughness are already very good, but the problem of wear resistance has not been solved. Remember what I told you about the definition of alloys? ”

Song Yi nodded hurriedly: "Of course I remember, only two substances mixed are called binary alloys, and if there are too many things, they are called complex alloys!" ”

"That's right! Then do you remember what we added to the lead when we tried to make lead movable type? ”

"It's a new metal discovered by Mr. called antimony!"

"That's right, and in your metallurgical tests, have you done any research on copper-antimony alloys?"

"This ......" Song Yi hesitated: "It doesn't seem to be there yet." ”

"Hmm......" Jiang Tian shook his head a little regretfully, if it is placed in the future life, if a new metal is discovered, the major institutes across the country will not rush to conduct the test, why don't these people know how to be in a hurry: "You find a few people to try to make copper-antimony alloy according to the proportion of six percent of the mixture." Then tell me what about the properties of the new alloy. ”

In this way, since the lead type battle, another metallurgical technology @ Yue @ into the official launch, later generations of the West in the comment on this matter, always said that China because of the earliest mastery of zinc and antimony smelting technology, so that Jiang Tian can have a lot of selectivity, so that China's metallurgical science once again led the whole world, and many people are not without regret to declare, obviously Europe has a longer history of large-scale manufacturing of brass, but in addition to casting bronze statues, but no one thought of using it to make other machinery, It makes the development of the machinery manufacturing industry in Europe too late. This argument has been circulating for more than 100 years, until one day after the ban on some original archives is lifted, people found that the "facts" that were previously identified are just lies released by the Chinese government in order to mislead the world, in the era when Jiang Tian presided over scientific research, China's metallurgical level has exceeded the world's understanding of metals, and many of the metals discovered and named by him have been used in a super-large-scale experiment, without this long-term national investment, even Jiang Tian could not have made a colorful alloy world. In order to keep secrets, the Chinese government at that time adopted the rarely used European alphabet as metal codes, but over time these codes became the universal element symbols, and were used in a wider range of fields to become the world standard, of course, this is a later story.

Before Song Yi could test out the reason, the craftsman had poured the new Qisan brass into the mold, and after cooling, he got the shining brass coins, looking at the smooth and flat surface, as well as the strong concave and convex patterns, everyone was full of praise for this batch of new copper coins, of course, there are also old craftsmen with superb craftsmanship, can reproduce the complex patterns by hand, and accurately make molds. Looking at the fineness of this batch of samples, he could have made a difference, but if it was just to make samples, he Jiang Tian would not have to work so hard, so he immediately instructed the workers to start making new molds out of stainless steel.

"The traditional clay mold is used only a limited number of times, and the weight of each batch of money is not consistent, so it is difficult to achieve precise control, so we have to start researching new coinage technology." Jiang Tian began to arrange the work in a heartfelt manner.

His idea is very simple, the melting point difference between steel and copper alloy is more than 500 degrees, so if a batch of steel molds are made, and then some coatings are applied, and after pouring copper water, it should be possible to take out a more standardized copper coin. According to his idea, the workers started a new attempt, but grinding steel and grinding copper are not on the same starting line, even if there is already a mother type, it is not possible to get a beautiful mold in a day and a half. So during this time, Jiang Tian began to guide the development of new formulas.

"Sir, as you say, the copper-antimony alloy is extremely wear-resistant, and the color is white and bright and bronze."

Seeing Song Yi holding a copper ingot like offering a treasure, Jiang Tian did not hesitate at all: "This alloy is not only wear-resistant but also corrosion-resistant, and the processing is simple and easy, but it is a pity to use it to cast money, you go and make this thing into a bearing, replace the hardwood bearing originally used for lens grinding, and try it, the durability should be able to improve a lot, and then try a new formula." ”

"And!" Song Yi was extremely excited, and he knew that Jiang Tian must have hidden a lot of good things.

"Do you remember the last time I was woken up by something?"

"A tin flask?"

"Yes, what are the two words on the flask?"

"Copper!"

"By the way, this time you can mix some antimony and copper in the tin, not too much in the proportion, and see if you can get a new metal."

Song Yi, who was already a little dizzy, had no doubts, he thought that no matter what Jiang Tian came up with, the direction was absolutely right anyway, as long as he followed his ideas, he would definitely get unexpected results, so he simply didn't ask where the inspiration came from. Jiang Tian was afraid of other people's suspicions, so he always wanted to find a reasonable reason, but in fact, he was throwing his eyebrows at the blind man. This alloy is a tin alloy called babbitt, and it should be used on a large scale in industry. But Jiang Tian bought a tin beer mug in later generations, which was used to take it out and fill it at the beer festival, especially in the open-air square, when a group of people were drinking German beer with glasses, he was the only one who was holding such a European thing, which was indeed more eye-catching. It stands to reason that he should buy a silver, but the price is too expensive and a little reluctant. In order to check whether this thing is toxic, he also remembered this babbitt.

Because of the low melting point of tin, the results were faster this time, and Song Yi ran to find Jiang Tian: "Sir, sir, is the medicinal silver recorded in ancient books this kind of thing?" ”

"It's not!" Jiang Tian replied with certainty: "If you want to make counterfeit silver, then mix copper and arsenic, but according to the ancient books, that thing will fade after a long time, and it won't take a few years to see the color of copper, and arsenic is highly toxic, are you willing to use it?" ”

Song Yi was stunned, he didn't expect Jiang Tian to study arsenic white copper so thoroughly, thinking about it, who in the whole of China dared to act in front of him: "But this time the thing is also silvery!" ”

"Silver white doesn't mean he's silver, those are used by alchemists, and Europa also has such a handful of people, always thinking about refining lead into gold, do you think they can succeed?" Sometimes it's strange that a bunch of paranoids can push history by chance. The Chinese Taoists developed gunpowder, and European alchemy advanced their metallurgy, but the greatest contribution of the European alchemists was to decipher the secrets of porcelain......

Song Yi was strange, just to find out those secret tin recipes, wouldn't Jiang Tian value it so much: "Then what's the use of this kind of thing?" ”

"You break this kind of thing into thin sheets or draw it into filaments, and then wrap it around the copper-antimony alloy bearing I said and ......then use it," Jiang Tian said in a foolish way: "Because this kind of thing has a soft texture and good ductility, it can play a protective role in low-speed bearings, and with other metal manufacturing machines, it not only greatly improves the precision, but also prolongs the service life." When the time comes, your level of lens grinding will be able to reach a new level. ”

This time, Song Yi shook his head: "Sir, it's not that I don't believe you, but I found that our machine can no longer improve its accuracy." ”

"Why?"

"Because when the bearing drives the gear, it will swing because of the poor occlusion, and the hardwood used to make the gear, the wood is still relatively soft, and it does not show such a big problem, but after changing to this copper gear according to what you said, it is not as good as before."

"De Xin......" Jiang Tian said a little helplessly: "I remember when I drew the lines of the wooden gears for you, I once said that if you change to metal, you can't use that shape anymore, right?" ”

"Yes, you said it, but you didn't tell me what the new form is?"

Yes, the result is still Jiang Tian's fault, but fortunately, there is no question of who bears the main responsibility between the two of them, so Jiang Tian had to be patient and began to explain again what is called involute gear! This is also part of Jiang Tian's shameless plagiarism, I think he has been tortured by similar questions for a long time for the exam, and he is more impressed, but he has never used it in life. To summarize simply, the involute gear is that the two teeth always maintain contact during the transmission process, so the vibration is small and the transmission efficiency is high, and it is the general name of various gears used on a large scale in later generations. But it was such a simple sentence that Jiang Tian explained for two days, and after using compasses and rulers of various shapes, and explained the principle of three-dimensional composition in a simple way, Song Yi understood the general outline of this complex part. According to the teaching norms of later generations, this thing could simply be compiled into a book. At this moment, Song Yi has a feeling that his eyes are spinning, just saying that a gear is so complicated and difficult to understand, but it is just the first glimpse of the door, and now he finally begins to have a sense of awe of science, which is no longer a novel and fun thing. He found that if he wanted to reach Jiang Tian's one percent level, he would need to study again for at least another year or two. The existing knowledge is no longer sufficient for future research tasks. This is the consequence of opening a small stove and pulling out seedlings, he is already considered to have a very high comprehension, and if he is someone else, he is afraid that it is no different from listening to heavenly books. However, Jiang Tian didn't care about his sad feelings, because the steel mold was finally made in the past two days.

"Hmm...... No! Jiang Tian himself was a little dissatisfied with the effect, in order to prevent the copper and steel from being cast together, he had to brush a layer of plant ash and fine mud in the mold, but in this way, the original delicate patterns disappeared, leaving only some words that could be recognized. The low-face copper coin itself is very simple, so there is no problem without patterns or anything, but the big money with a face value of ten is a stroke of genius that Jiang Tian is proud of, and the front of this coin reads "Ten Wen Heavy Treasures", and there is a line of small characters in Yin text below: Made in China. On the back is the chrysanthemum decoration of the Imperial Family, and the edge of the coin is also changed with the petal shape of the ornament, and the circular stamen in the middle can be hollowed out to wear a rope, so the reverse view of this big coin is simply a bronze royal three-dimensional badge, and because the design is too exquisite, this shape has always been the reserved form of Japanese coins, and has been used for hundreds of years. Of course, some people also suggested that it would be disrespectful to use the royal ornament as a coin, but due to historical reasons, the emperor of the year did not veto it, and it was difficult for the grandchildren of later generations to overturn this design, not to mention that this is Jiang Tian's work, and it must be kept anyway. But now look at it, not only the small characters are not clear, but the texture of the chrysanthemum is not too conspicuous, that is to say, the steel mold casting is basically unsuccessful.

"Sir, it's better to keep it simple, cast some simple ones first, and then talk about it when there is a new way later." Song Yi enlightened: "Anyway, they are minting money for him, and the good or bad is better than their own." ”

Jiang Tian smiled bitterly: "It's me who is naïve!" In fact, there is a good way, but I have to find an idea to get closer, which is considered a failure, so let's go back to the original track. ”

"And what are you going to do?"

"Simple, put the copper plate between the two steel molds, and then clamp it with a clamp, find a strong hammer to hit the iron!"

It's a simple and crude solution! But it was very effective, after finding a blacksmith to hammer it ten times repeatedly, opening the mold and seeing, a complete coin was formed, and only the edges needed to be slightly polished, which was much more beautiful than the cast! Now the people in the workshop are dumbfounded, can they still do this with copper coins? But that's not money, is it?

"That's right! I give this process a name: Stamping! ”

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