Future library

The Shen family is much larger than the Cheng family, but its influence and control in the capital is less than one-third of the Cheng family's in Shaonan. The carriage with the Chinese flag "Chen" cannot even guarantee the passage privileges of ordinary nobles - when passing through the second gate, there were actually city guards collecting money.

Cheng Jinzhou, who was still familiar with aristocratic life, couldn't help but widen his eyes. This kind of thing is not to mention the Great Xia Dynasty that emphasized differences in status. In a more mature era, a gentleman with a special license plate was stopped on the spot by a highway toll station. It was normal for him to get angry no matter what. What he didn't expect was , Lin Bo handed over the money in a polite manner, and Shen Cong remained silent.

"The emperor's rules." Classmate Shen Cong explained guiltily, feeling that he had been embarrassed in front of the country nobles.

"I thought nobles didn't have to pay taxes." Cheng Jinzhou insulted him in a nonchalant manner, irritating Mr. Shen's nostrils.

In fact, not only the nobles did not have to pay taxes, officials did not have to pay taxes, and the distinguished gentlemen did not have to pay taxes, the Star Warlocks recognized by the Star Warlock Association also did not have to pay taxes. All these factors formed the internal structure of the Great Xia Dynasty that had been founded for hundreds of years. A huge tax-free class. On the plus side, it is this tax-free class that supports the normal operation of the country - without benefits, who would support His Majesty the Emperor to live a happy and free life.

Shen Cong blushed slightly because of his anger and said: "Our Emperor is crazy about money. The capital is fine, but he only sets up a card to collect money. Hexi is bad. I heard that the transshipment envoy is trying a new tax law..."

"You know all this?"

"There is no toilet for diapers." Shen Cong finally got rid of the topic just now.

Cheng Jinzhou had a close relationship with Liu Bin, and he had no other way to learn about the court news, so he took the opportunity to inquire in detail.

When the 17-year-old boy needed recognition from others and longed to express his feelings, Cheng Jinzhou only made a moderate expression of praise, and Shen Cong could talk endlessly. The latter had nothing to worry about when facing a 13-year-old child, and his face flushed with excitement while dancing. Because the slightest displeasure caused by the city guards has long been forgotten.

For a while, classmate Shen Cong even felt that his new classmate was knowledgeable and interesting, and it would be good to train him as a younger brother.

…

Entering the warehouse area of ​​​​the dock, the carriage bumped violently, and the speed of people and cars coming and going suddenly slowed down. When the strong men at work saw the noble flags, apart from giving way, few of them deliberately avoided the road. Perhaps they were the nobles in the capital. There are so many of them that they can’t avoid them even as they become familiar with them.

Because it was built on a water and land thoroughfare, although Xiajing's population is not one million, the area's supplies are richer. The West Pier built along the Jingzhou Canal stretches for more than ten miles, and the largest navigable ship is only three to four hundred tons. Under such circumstances, it is no exaggeration to say that there are thousands of ships and thousands of sails.

Shen Cong was disgusted with the smell of fish, sweat and decay floating on the dock. He pinched his nose and cursed something, jumped out of the car and said fiercely: "You'd better let me see something interesting, this place." …”

On the bumpy ground, it is natural for boots to splash some muddy water, but getting a pair of Shaw's official boots with Nanhu silk uppers and lambskin edging dirty is costly. Shen Cong frowned as if he had been molested and said, "Shaw's boots are hard to buy."

"It's still a limited edition." Cheng Jinzhou was two heads lower than him, but he held his head high and said: "Uncle Lin, please lead the way. Have you got the sulfuric acid?"

"There are 4 jars of the stuff you call 'sour' in the shop. I don't know if it will go away. It has been delivered." Lin Bo laughed. The seventh-rank official in front of the prime minister's door said to a 13-year-old child. It's much more natural.

"That's fine." Cheng Jinzhou was satisfied that there was almost something he could fool.

The Shen family's warehouse is in a very good location. It's about three to four hundred meters away after getting off the carriage. Because it was specially vacated, only one third of it is filled with pottery, lacquerware and other goods. The free space is enough for two basketballs. The size of the farm was so large that more than 300 stones of grain were piled alone in the corner of the door, looking as if it had been abandoned.

Cheng Jinzhou picked up the wheat with his hand and looked at it for a moment, then said with satisfaction: "It's very good. I'm sorry to bother you."

As the saying goes, practice makes perfect, and he can tell the quality of some food to some extent.

Uncle Lin didn't know whether he, a child, could understand it, so he just laughed and said, "Young master, it's fine if you like it."

For a family like the Shen family, court restrictions such as food reporting and other matters have no effect. When local officials want to claim their humble positions, there is no need to expect officials to question court officials about this. In the end, it is still a situation where the people do not appoint officials and do not investigate. Moreover, the transaction volume in the capital is huge, and it is difficult to keep accounts as clear as Shaonan's. Naturally, the Shen family is not as cautious as the Cheng family.

Cheng Jinzhou rubbed the ring face slightly, turned around and said with a smile, "How about leaving me alone in there?"

"I've been with you for half an hour and my clothes and shoes are all scrapped. How dare you keep me out?" Shen Cong got a silk scarf from nowhere and covered his face like Zorro in a Category III movie. He hated me. He said with hatred: "We are also the number one person in Hongwen Hall."

"Where's the sulfuric acid?" Cheng Jinzhou smiled casually. The latter thought he was as easy to fool as a 13-year-old child, and he looked at a 17-year-old child as well.

"In the corner over there, I'm worried about contaminating the food." Lin Bo said carefully.

Cheng Jinzhou looked around and saw that there were four small jars piled in the opposite corner, the size of a 10-pound soju can. Walking a little closer, you can smell the familiar pungent smell of sulfuric acid. Xiao Cheng covered his nose and started laughing.

It is much more wonderful to encounter sulfuric acid while traveling through time than to meet old friends in a foreign land.

On the opened interface, customer service 010 had long been impatient and urged: "If you are buying a book, there is now a 70,000-word one. Are you sure?"

Cheng Jinzhou turned his back to Young Master Shen, pretending to be looking at vitriol, and said while flipping his lips up and down: "Exchange a book with more words."

In his understanding, those with few words in libraries are mostly papers, magazines and pamphlets, while the better ones are "cultural relics" left over from previous generations. For him, compared to the timeliness and professionalism of papers, those books that have been summarized and matured may be more useful, although from another perspective, the content of the books must be uneven, and the chance of getting good things is not necessarily Increase, but Cheng Jinzhou still wants to try it. Previous experience has proved that if you only buy short books, it is difficult to find satisfactory content. If you finally find it, it will be like "Mechanical Metrology", only the first part , which is very unpleasant to read.

Customer Service 010 did not need to study Cheng Jinzhou's psychology and said straightforwardly: "If you want to determine the word count, then relax the requirements in other aspects."

"I've heard too much about quantum laws and the like." Cheng Jinzhou curled his lips and said, "Then there's no need to determine the word count. I'll decide it myself."

Last time, he played a similar game with his customer service comrade. Although both of them were so tired that they were foaming at the mouth, he obviously won. As a customer service person, Comrade 010 definitely cannot compete with Cheng Jinzhou in practicing endurance in his spare time. Seeing his tough attitude, he had no choice but to compromise: "120,000 words, are you sure?"

"When I say yes later, we will trade again." After Cheng Jinzhou finished speaking, he brought out a jar of sulfuric acid wrapped in a rag, covering his nose with one hand and untying it with the other.

The first thing mixed in the air was the smell of sulfur. From the perspective of the nasal mucosa, there was no overall change.

"It's distilled and calcined." Cheng Jinzhou sighed. Although he has a PhD in theoretical physics who uses cheating as his main tool, simple chemistry is still not difficult for him.

The so-called distillation and calcination is to distill ferrous sulfate, which the Chinese call green vitriol oil, in a sealed environment. The main purpose is to use high temperature to decompose ferrous sulfate and allow it to decompose into sulfur dioxide and sulfur trioxide. The latter When combined with water, it becomes sulfuric acid. The more advanced method is to find ways to convert sulfur dioxide into sulfur trioxide to increase its concentration. In an environment like the Daxia Dynasty, if you smell the strong smell of sulfur dioxide, you will basically know how to make it.

"These four cans of stuff cost a lot of money." Cheng Jinzhou asked specifically. Distillation and calcination consume a lot of manpower and firewood, and the price cannot be as refreshing as in the industrial era.

"A jar of three taels of silver." Lin Bo replied from the side.

The price of a 10-pound bag costs two acres of land, but it is much cheaper than Cheng Jinzhou imagined.

Before he spoke, Shen Cong couldn't wait and said, "Don't worry about a small amount of money?"

Even though he was covering his nose, Student Shen still looked at the viscous liquid in the jar with curious eyes and wanted to touch it with his hands.

"It will cook." Cheng Jinzhou quickly grabbed him and said, "This thing can corrode iron."

After saying that, he ordered: "Go and get a larger basin, preferably ceramic, and then bring the water.

"Will ceramics not rot? Is it not harmful to food?" Shen Cong looked at it curiously, and even showed one of his nostrils.

Cheng Jinzhou ignored him. After a while, the servants brought two large stone troughs, one for storing water on the boat and one for drinking water for cattle and horses. Both were more than two meters long. In addition, four or five bags of water were packed in leather bags. Water, Lin Bo felt the same and asked in interest: "Is it enough?"

"That's enough, that's enough." Cheng Jinzhou said, calling another servant to carefully lift the sulfuric acid and slowly pour it into the stone trough.

An unpleasant white gas rose quickly, mixed with the stench accumulated in the stone trough for many years, as if a mantis was flying up.

Cheng Jinzhou casually grabbed two handfuls of wheat and threw it into the sulfuric acid, saying, "Look at how powerful it is."

The wheat fell into the trough and immediately turned black. The only thing that can compete with concentrated sulfuric acid dehydration is government tax revenue.

"What are you going to do? I see that other star warlocks use many kinds of things and cook them together." After all, Shen Cong came from a noble family and was well-informed in this era.

Cheng Jinzhou smiled and refused to explain, how could he really know any astrology and alchemy? He gave a few instructions in a low voice, and the two servants immediately took action.

A long bamboo tube was brought in again, and a skin bag filled with water was attached to it for later use. Another person shoveled wheat into a dustpan, ready to lift it at any time. Cheng Jinzhou stood far away behind the wheat pile and asked others to stay away.

Sulfuric acid itself contains a large amount of dilution heat. To put it simply, it releases a large amount of heat when it is diluted. And because sulfuric acid is heavier than water, if water is poured into sulfuric acid, the water will float on the sulfuric acid. Only the contact surfaces between the two sides will generate heat, which will become localized heating, causing the liquid to tumble. A large amount of contact will cause more violent tumbling. Even if sulfuric acid is splashed out, if the amount is large enough, the operator will become like the Tsinghua version of the bear.

Therefore, the correct approach should be to slowly add sulfuric acid to the water and stir it continuously to fully dissipate heat. Due to its inherent danger, in the chemistry experiment class at school, the teacher will inevitably give you numerous instructions and never tire of shouting: "Pour the sulfuric acid into the water and stir it with a glass rod..."

If sulfuric acid dilution had not been used too much in experiments and was unavoidable, the talents of the Ministry of Education would have found 100,000 reasons to ask middle school chemistry classes to stop such tragic and dangerous experiments.

Cheng Jinzhou didn't have the consciousness of a genius at all. In addition to shouting "Everyone back off", he kept rubbing the ring on his hand and whispered: "Mr. Ke, I said a deal, you just accept the things."

"Okay." Customer service 010 had no objection to this.

Both Shen Cong and Lin Bo opened their eyes wide, ready to enjoy the performance of the star warlock who was soaked in sulfuric acid.

"Pour some water." Cheng Jinzhou shouted.

One skin of water is quickly poured into the bamboo tube, flowing down the bamboo joints, followed by the second skin, and the third skin.

The concentration of sulfuric acid obtained by distillation and calcination is usually difficult to exceed 76%, but even if the quality is worse, the calories contained in 10 pounds of sulfuric acid are still quite terrifying.

The clear water in the first skin bag flowed into the sulfuric acid calmly, making a sizzling sound, accompanied by a faint white smoke. Shen Cong waited for three to five seconds, and was about to turn around and laugh when the water surface suddenly started to roll. After another two or three seconds, The entire stone tank became violent like water pouring into boiling oil, and water droplets containing concentrated sulfuric acid were splashed in all directions. The servant who was pouring water from a high place snorted and hid behind the door panel. The man carrying the dustpan vigorously threw the wheat grains out, then hid his head behind the dustpan and ran backwards.

If it were just water in a skin, the performance might have ended here, but the water saved in the bamboo tube was continuously injected into the sulfuric acid, and the previously unreacted water also accumulated together. The ever-increasing changes in cold and heat caused the water in the water tank to The sulfuric acid flew up like an explosion. Whether it fell to the ground or hit the wall, the hot sulfuric acid would continue to emit heat, and the white gas with a burnt spicy smell soon filled the entire warehouse.

Cheng Jinzhou rubbed his ring face in a low voice and said, "Mr. Ke, it's a deal."

The piles of food quickly disappeared without a trace.

"Star Alliance Reader, "Elementary Mental Arithmetic Tutorial", there is a 50% surcharge for translation." Customer Service 010's voice was dry.

"Elementary mental arithmetic tutorial?" Cheng Jinzhou recited his name silently and said decisively: "OK."

120,000 words costs 120 star yuan, and if you add 50%, it will cost 180 star yuan. It is really not a small amount, but when Cheng Jinzhou saw the content on the ring, he no longer thought about the small issue of how much he spent. .

The door of the warehouse was wide open, and the smoke disappeared from the warehouse. It smelled like a barbecue site. Shen Cong ran over coughing and shouted with a mysterious look on his face: "Is all the food that was burned just now?"

The pile of grain, which was larger than a truck, was missing. The place was filled with thick smoke and the smell of burning sulfur. It was not surprising that he had such an association.

Cheng Jinzhou, who was originally ready to continue telling lies, ignored him and rubbed his fingers, flipping through the pages of the book. The "Elementary Mental Arithmetic Tutorial" in front of him turned out to be a book on computing technology that he had never even heard of - in the 21st century, there are countless quick mental arithmetic methods, such as the famous abacus mental arithmetic. After systematic training, you can Completing 18-digit multiplication in one second is terrifying, but after all, it is just a calculation method and does not have the ability to face problem analysis. Users are more inclined to process numbers than to take into account other matters. .

But the "Elementary Mental Arithmetic Tutorial" displayed on the surface is obviously a calculation technology used to deal with practical problems.

"Star Alliance Reading..." Cheng Jinzhou repeated what customer service 010 said before.

"What did you say?" Shen Cong asked Cheng Jinzhou with excitement and confusion.

"Do you know how many steps we have to walk from here to the lighthouse in front, and then to the largest ship on the right?" Cheng Jinzhou looked at the example in the void and smiled stupidly.

Most of the children from aristocratic families would learn some basic mathematics. Shen Cong asked inexplicably: "Can you use that acid to calculate things?"

Cheng Jinzhou stretched out a thumb and pointed at the position of the carriage in front of him: "Do you know how humans determined the longitude and latitude back then? It was through the projection of the stars and the sun."

With a mysterious expression on his face, he said to himself: "If I know the angle and the height, I know everything."

"Who said this?"

"It's what the book says." Cheng Jinzhou laughed and said, "There is nothing more to do with trigonometric functions and ruler and compass calculation."

…