Don't think about it, all this is naturally from Bai Ji's hand.

The principle is actually very simple, Bai Ji turned out a lot of luminous stones from the treasury. Seeing Chun Yu Yue holding it like a baby every day, I wanted to tell him that this thing is very likely to have slight radiation, and long-term wearing is not beneficial to the body. The pearl of the first night of this year is also known as Suihou Zhu or Suizhu, and it has become the two treasures of Spring and Autumn with He's Bi.

There are more and more night pearls obtained from subsequent mining, and they are not as rare as before. According to Wang Qian, there are a lot of beads in his house. It was night, and the beads were faintly fluorescent. Bai Ji was also inspired by an idea, if he was blessed with immortal methods, maybe he could make this light stronger?

As I said before, it is basically done at sunrise and resting at sunset. After dark, you basically rest. If you have a wife, you do sports, and if you have children, you can beat the children and play. Don't think about candles, few people in the entire Qin Kingdom have lit them. Most of them are illuminated with paste refined from animal fat, and "Chu Ci" has a saying that the blue paste illuminates candles.

It doesn't matter to ordinary Qianshou, but it's not a good thing for young students. Now it is not like the future generations, and the burden must be reduced if there is no need. Time is the most precious, and if a young student wants to succeed in his studies, he must use the time in the evening. Bai Ji said that Qin Shou's generation is destined to suffer for two or even three generations, and only in this way can the Qin State become rich and strong.

The entire school palace was as bright as day, and the street lamps were lit up with it. The light source comes from Suizhu, and after Bai Ji is instilled with blessings in the immortal method, the radioactive side effects of Suizhu are erased, and its brightness has skyrocketed dozens of times. The principle is not complicated, the reason why noctilucent stone can emit light is due to the electronic transition of its outer layer when its particle is affected by excitation factors.

Therefore, when the luminous stone absorbs enough energy from the outside world, it can release light at night or in a dark room. What Bai Ji has to do is to replenish his energy with immortal methods, change the characteristics of his outer layer, and make his brightness skyrocket. That's probably how it works, it's actually quite simple.

The classrooms and dormitories were all lit up with a soft milky white light, and Qin Shi Huang and the others looked around, all stunned. They were all immersed in this situation, and they couldn't even speak. Bao Bailing and other elderly courtiers trembled with excitement.

"Miraculous!"

"How did the national teacher do it?"

"The night turns into day, and this kind of miracle is the only master of the country."

……

The effect of these street lamps is actually similar to that of normal electricity, and they also have switches. During the day, cut off the main line to supply immortal power, and at the same time run the spirit gathering array, which can absorb spiritual energy imperceptibly. A similar principle is probably similar to that of a solar street lamp. Charge during the day and turn on the lights at night. As long as you get to the point to order someone to switch, it is simple and convenient.

The overall design was not difficult, and Hu Hai was even involved in it. Following Bai Ji's engraving, he also has his credit for designing switches and sockets. At present, only the Baiji Mansion and the School Palace have these street lights. Bai Ji also created a lot of crystal lamps, carved into different shapes, which is more moving.

Then, Bai Ji pressed the switch next to him. The palace of Afang was also as bright as day in an instant, and Li Si and the others were all surprised, and some people were even a little puzzled. Looking at Bai Ji, he said in a trembling voice: "So, the purpose of the national teacher's move is to make it possible for young students to study at night?" ”

"That's right."

When Li Si was studying in the past, he couldn't light a candlestick at night, so he had to rely on the moonlight. When winter comes, read a book in the snow. Years of penance have made Li Si cherish his current life. He also often used this experience to warn his children to cherish their time and study hard. And now the white grass directly turns the night into day, and any candle flame is eclipsed by it.

Qin Shi Huang looked at the soft light and understood everything. This light is actually similar to a candle flame, but more dazzling than a candle flame. The light that blooms is enough for young children to study at night. He would review bamboo slips every day until late at night, so he naturally knew the value of street lamps.

"The national teacher bothered."

"Ji is just doing it, it's nothing."

Bai Ji really didn't work that hard, these are just small means. He didn't know much about electricity, and his physics knowledge only stayed in high school. Even if there is electricity, how do you make a light bulb?

He really didn't know......

It's better to use the immortal method to cast it, and then think about it slowly.

Before Qin Shi Huang left, Bai Ji also gave him a small table lamp. In fact, it is made of a small spirit gathering array and luminous stones, and the shape and function are almost exactly the same as those of later generations. There is a switch at the bottom, which can be turned on by pressing it, and turned off by pressing it again, which is extremely simple to operate.

"National teacher, is there any more of this lamp?"

Meng Yi rubbed his hands, and the light in his eyes was brighter than a desk lamp. He saw a way to make a fortune again, and while the rest of the ministers were in the carriage, he couldn't help but come over. If you do the math carefully, you will know that with the cheapest and cheapest ointment, it will cost six dollars a day. More than 300 days a year, that's 2,000 dollars.

As Bai Ji said just now, it is better to use three hours a day for a table lamp. As long as there are no accidents, it can be used for at least ten years! If so, how much is it worth? Xianyang Xungui is not bad for money, Meng Yi can be sure that this lamp will definitely sell, and the sales will definitely be quite good.

"You want?"

"Ahem, this kind of immortal weapon, Yi naturally wants it, the price is negotiable!"

Bai Ji smiled, this is simply a deal sent to the door. In fact, the overall structure is not difficult, and it only takes him a few minutes to make the piece. There is not even much immortal energy to consume, and many parts can be completed by craftsmen and Hu Hai. Only the most core formation needs to be handled by him personally.

"Meng Gong and Benjun also have some friendship, so ...... How about five thousand dollars? ”

"No problem!" Meng Yi agreed without saying a word, and didn't even pay back the counteroffer. As long as he adds a little oil and vinegar, it will not be a problem to sell it for 8,000 yuan. "As long as there is a national teacher, you will receive as much as you come."

His thoughts, Bai Ji naturally knew. In fact, he can sell it directly to Xianyang Xungui himself, but his identity is here, and some things are inconvenient to do by himself. Meng Yi is an old fritter anyway, and he can eat well in Xianyang City, so he doesn't care. With a wide range of contacts and a thick face, it is more appropriate to hand over the business to him.

"Lao Chun, you take Meng Gong to the treasury to get some."

"Yui!"

Chun Yu bowed more and more, and his pupils had changed into the shape of a copper coin. The two who sympathized with each other just left, and their hearty laughter could be vaguely heard, and the deal was so happily concluded. Watching them leave, Hu Hai couldn't help but look at Bai Ji, and said strangely: "Hu Hai heard my father say that Meng Gong has always been fair, honest and loyal. How could it be ......?"

"To be a human being, you must know how to be flexible." Bai Ji couldn't help laughing, and said indifferently: "The daily expenses of the school palace are extremely large, and the rivers have been flooded in the past few days, and the money and food in various places are stretched, and it is difficult for the emperor to fund too much. On the contrary, it would be better if these nobles could be allowed to pay for themselves. ”

"I see...... Hu Hai looked at Bai Ji, "Hu Hai still has something unknown." Mr. is a true immortal, and there are all kinds of mysterious means, so can it solve the flood? ”

"Not yet."

Bai Ji shook his head, the annual flood season is about March to April. He wanted to wait until he had set foot on the foundation before he could deal with the floods. Because of natural and man-made disasters, Bai Ji's merit points have decreased a lot in the past two months. He really didn't understand how to control the water before, but it was easy to strengthen the embankment and the like. Using immortal power to make the embankment impregnable is completely trivial.

It is better to control water blockage than to dredge, and it can also be diverted through water storage to reduce flooding. There is no need for Bai Ji to say these things, they are doing better than Bai Ji. The water conservancy projects of the Qin State are a must, such as the famous Zhengguo Canal, or the Dujiangyan built by Li Bing in the early years, or the Ling Canal in later generations. You must know that Dujiangyan is still playing a role more than 2,000 years later.

Bai Ji has been busy with this matter in the past few days, and asked Chun Yuyue to send a lot of books. Even, he bought a lot of materials from the system mall. He is now a glance and ten lines, and he will never forget it, and he just needs to spend some time digesting it every day. I also have a little experience in dealing with floods, but it's just a piece of paper after all.

He had never experienced the floods himself, but he saw them on TV. The annual losses caused by flooding are incalculable. Even later generations could not completely resolve it, and finally had to open the floodgates, affecting the property and personal safety of the local people.

Flooding is dangerous, but it's also an opportunity. If it is handled properly, it will definitely bring many heads back to their hearts. Take Nanjun as an example, it was previously the territory of the Chu State. Qin and Chu have countless grievances, and the one who hates Qin the most is none other than the three kingdoms of Qi, Chu and Yan.

After the king of Chu was captured, the prince of Qin went to Fankou to be captured, and was blamed for the crime of killing the king, and was abolished as a concubine. Later, he was reduced to a prisoner and repaired the imperial tomb of Lishan for Qin Shi Huang. This kind of humiliation naturally made the Chu people extremely indignant. Take Nanjun as an example, there are a large number of bandits, and there are many Chu people who are trying to restore in vain.

There are floods every year, not to mention the two places in Bashu, and Nanjun will suffer more or less. This year, the ice and snow melted, coupled with the continuous heavy rain, once the levee bursts, Nanjun will definitely suffer heavy losses!

He didn't take the job, in fact, he was just waiting for an opportunity. When it really can't be solved, Qin Shi Huang will naturally come to him. Moreover, he also prepared something that would be useful for the levee when the experiment was successful.

"You don't need to worry about this flood." Bai Ji paused and looked at Hu Hai, "You have grown a lot now, and then study hard in the School Palace." By the way, have you thought about what to choose for your major? ”

Hu Hai's score this time is also a full score, so he can naturally enter the second grade directly. In the second year, there will be three main courses and one professional course. The main courses are literature, arithmetic and science, of which science is taught by Bai Ji himself. There are only two large classes per week, mainly teaching physical and biochemical knowledge.

There are so many options for professional courses......

Hu Hai's eyes were firm, looking into the distance, "Hu Hai wants to learn the art of war!" ”