When Shu Hui and his entourage returned to the gate of the house after going around and eating in a circle, the time displayed by the system was only half past seven, but the ancients' dependence on natural light made the county town at this time very lively.

There was a slave waiting at the door to take care of Ao Guang's horses, and Shu Hui and the three of them took the panda and bear Fat Da to the back door of the county office.

The back door of the county office is slightly staggered towards the main entrance of Shu Hui's house, which is specially opened for the convenience of Shu Hui's access. There's not even a lock here, and no one would break in.

The door is just empty, and behind it is the garden where Shu Hui transplanted roses three years ago. The county Cheng, who was bedridden because of the stone shower, often came to check after getting better, and there were still a few scattered chrysanthemums in the garden in late autumn.

Because Shu Hui didn't want to enter Chang'an, a prosperous place of right and wrong, Yuan Tiangang also followed and stayed in Huojing County. Even with him, one of his subordinate officials also remained in office, but as compensation for their inevitable promotion after the end of their term of office, there will be no flat adjustments and other situations.

When Shu Hui familiarly bypassed the three halls and entered the inner hall to go to Yuan Tiangang's county mansion, several officials and slaves of the county office were moving a wooden box stuffed with straw into the house. Fat Da ran to the front to climb the threshold, but two or three times failed, blocking the door and putting several people in a dilemma.

Yuan Tiangang's long follower Fuchen was beside him to supervise these officials and slaves not to bump into the things inside, and when he saw Shu Hui and the others at this time, he hurriedly saluted: "The county is safe!" ”

The son of the founding county, the eighth knight, is on the fifth grade. Dressed in scarlet clothes, 500 households in the food district, and enjoy 800 acres of Yongye field.

If it weren't for Shu Hui's young age, Li Shimin was worried that there would be an embarrassing situation where he would have no official title to seal in the future, and Shu Hui would have been able to wear purple clothes at this time.

Needless to say, one is the right to exploit and the other is immovable property. In Shu Hui's food estate, he could arbitrarily set the tax ratio or levy labor. Yongye Tian can also adjust the tenant rent at will, of course, the tenant has the right to choose to stay compared to the food tenants.

However, at present, both of them are run by the imperial court, and they are converted into a fortune and distributed to him. Shu Hui is not interested in this, he does not have a large family to raise, and he has no idea how expensive firewood, rice, oil and salt are. And there is still psychological resistance to this kind of cannibalism.

He didn't even remember where his fief was sealed.

However, if you are above the fifth grade, you can wear red clothes, so according to the official grade and uniform color system of the Tang Dynasty, the only colors he can't wear now are purple and local tyrant gold. In a few years, wearing purple clothes, there will be only one kind of local tyrant gold left, which belongs to the emperor.

Shu Hui asked Ao Guang to drag Fat Da back by the back of his neck [gěng]. When the box was moved into the house, I saw Yuan Tiangang waiting in the middle of the courtyard to receive his box.

"Hurry up and open it and see if it's broken."

Yuan Tiangang was just sixty years old three years ago, and now he is still in good spirits and does not show the slightest old age. As soon as I saw Shu Hui and his party, my face was unconsciously full of smiles.

"Shu Hui, Ao Guard, and the little lady of the red fish, you are here just in time today...... Yes, yes, yes, and Fat Da, don't bite my clothes, whisk the dust and hurry up to Wu Shaofu to cut a spotted bamboo! ”

As Yuan Tiangang spoke, he kept slapping the big mouth of the fat man who stood up and bit his sleeve. There used to be a few elegant bamboos in the courtyard, but because they belonged to Fatda's favorite genus, the sword bamboo, they no longer exist.

"Master Yuan, what the hell is in your box, so careful......" Hongyu and Ao Guang also greeted each other briefly. After three years of getting along, several people have become very familiar with each other.

Before the Song Dynasty, Ye was just an honorific title for adult men. Before greeting Shu Hui with dust, he directly called Shu Hui County, which is not only a title, but also a title to express respect. Compared with directly calling Shu Hui a lord, the county is undoubtedly much more noble.

However, for Shu Hui, there is nothing wrong with letting the elders above his father call him grandparents from later generations, and the relationship between Shu Hui and Yuan Tiangang is also quite intimate, but there is no such name in the Tang Dynasty.

"Didn't you say you came by chance? A few days ago, a few days ago, a batch of new gadgets had just been burned in the Qiong kiln under the rule of Qiongzhou, and Liu Yuanjun sent a few pairs to the county offices under the jurisdiction of Qiongzhou, of course, Shu Hui's share is indispensable. ”

Shu Hui touched her chin, indeed, every time there is something good, she can't miss her own share. The museum shelves in the main room of his house are almost full, and he can't appreciate those things that are given by the emperor or listed as tribute by neighboring states and counties.

At this time, the lid of the box was pried open, revealing several large bowls with a touch of turquoise and blue inside. Looking at its appearance, I really don't dare to compliment, the five-yuan free shipping that Shu Hui once bought is dozens of times more beautiful than them.

However, Shu Hui is not the first time to come into contact with this kind of porcelain, because he knows that this unsightly bowl is actually a fine Qiong kiln product made of high and low temperature underglaze firing using the highest coloring process at this time. In the Sui and Tang dynasties, the Qiong kiln represents the richest colors and the most complex styles.

Shu Hui looked at these thick-walled bowls strangely, and couldn't help asking, "Is there still a custom of sending rice bowls?" Is there any special meaning that does it have? ”

Before Yuan Tiangang could speak, Hongyu blushed when he heard this, pulled Shuhui's collar and reminded in a whisper:

"Young master, that's an oil lamp, and there's a table holding a wick in it......"

Shu Hui was also speechless when he heard this, he hadn't seen the handle like a table before, but he still thought it was a special structure to put a spoon [chí] to avoid sliding into the bottom of the bowl.

He was ready to despise him - the new thing he said was just a spoon in a bowl that wouldn't slide down, was it ridiculous? He had never seen such a boring invention!

After all, at this time, he was only six years old, although his height was outstanding, but he was only one meter one, and he could not reach the height of an oil lamp at all.

However, after Yuan Tiangang's explanation, Shu Hui understood the significance of this structure. The new type of oil lamp, called the fuel saving lamp, is quite complicated, and the price of each lamp is more than 10 times higher than that of ordinary oil lamps.

Shu Hui's previous handle-like structure was not just to facilitate the control of the length of the wick, in fact, the master who designed it did not consider this problem at all.

Its real purpose is to make the oil lamp fill the water from the water injection hole on the back, so as to avoid the backflow of water from the upper part of the oil lamp when it is reversed.

But Shu Hui still didn't understand: "Filling water in the oil lamp can save fuel?" ”

He thought about it, could it be because water is denser than oil, and water is slowly injected below the oil layer through a special device, so that the oil can float onto the surface of the oil lamp...... In this case, if you use a floating wick with a limited length of time, you can make the light more stable.

But it doesn't save fuel! Shu Hui picked up an oil lamp and looked through it carefully, but did not find a device that could inject water below the oil layer, and the front of the oil lamp was completely isolated from the water injection interlayer behind it.

Ao Guang glanced at Shu Hui with some concern, the young master seemed to have a little less flexible brain since his mana was damaged.

"Young master, after filling the water, this oil lamp will not burn too hot......" Hongyu reminded in a low voice again, seeing that Shu Hui was still ignorant, he finally said the answer:

"That way, the oil won't run too fast!" After saying that, he pouted a little angrily.

It's not that Redfish and others are really so flexible. The use of cold water to cool down the oil evaporation process has long been used in the palace.

Because the oil lamps in the palace are mostly made of copper, very complex shapes can be obtained using the lost-wax process. Immersing a burning oil lamp in cold water can save fuel, and this life hack has been widely used for a long time.

Shu Hui suddenly realized at this time, this can't be blamed on him, from the 21st century, which is extremely rich in materials, when has he ever seen the need to live such a sharp life? Even the volatile oil has to be saved, and there will be no such "Qingqi" idea in his mind.

At this time, when lighting at night, wealthy families use edible oils such as animal fat, flax oil, and sumac seed oil, while ordinary people use toxic vegetable oils such as tung oil and soapberry oil. Due to the scarcity of oil sources and the backwardness of the crushing process, every bit of light is extraordinarily precious.

In particular, the sesame oil, which is widely used by readers for lighting, has a boiling point of only 215 degrees Celsius and is very volatile. Compared with the boiling point of 335 degrees Celsius, which was commonly used for lighting by Shu Hui in later generations, the boiling point is 120 degrees Celsius lower.

Therefore, the successful firing of porcelain fuel-saving lamps by Qiongyao this time is really a great achievement. After all, there are only a few people who can use copper lamps, although the scholars are more prosperous than ordinary people, but there are also many scholars who are in the middle of the road, or the children of the poor families who are unwilling to be mediocre will worry about the lamp oil.

Yes, before that, anyone who could use a copper oil lamp that could be built at great cost and mixed with cold water in the mezzanine to cool down did not need to bother with this lamp oil. The picture is just a vassal elegance, or a reputation for incorruptibility.

Shu Hui figured out these joints, and he could understand why the new Qiongzhou Thorn Shi was so happy and showed off gifts everywhere. According to his experience in stir-frying in his previous life, such a small lamp, optimistically, can even save at least one-third of fuel in one night!

Yuan Tiangang gave the data that Liu Tingshi said: "It can save half of the fuel!" ”

At this time, it is late autumn, and the nights are long and the days are short. With this kind of oil lamp, which is only ten times more expensive than ordinary ceramic oil lamps and only costs 30 yuan, it can be said that only two large liters (about 1.2 liters today) of sesame oil can pay off. The fuel saved in one winter can support them to study hard for a spring.

This made Shu Hui sigh, I really can't underestimate this simple invention. With this alone, at the end of Liu Jianshi's three-year term, he can at least be transferred to a more prosperous state, and it is more likely that he will be promoted to a Beijing official.

And Shu Hui has been here for three years, and the things in his conceited mind can beat all the dirt buns of this period in the field of science and technology, but except for the direct reward of Aspergillus purple, which made him beautiful, it can actually be said that he has no achievements.

And the former, in Shu Hui's heart, actually feels that he is cheating, not relying on any real ability.

I thought I was very good, but I didn't do anything. Breakthroughs are happening in this world every minute, but there is no credit for his Shu Hui in it.

It makes no difference to think that your knowledge is limited and to come up sooner or later – but for those who will benefit from it, there may be generations of people who have missed out on their prime.

In a safe corner, he has no ambitions, just playing with some flowers and plants, limited to food, clothing, housing and transportation...... Is such a day an excuse for his young age to make him feel at ease?

"Maybe I've been at ease for too long and I'm starting to fall." Recalling the days of youthful struggle in the previous life, there was never a moment to stop warning myself not to relax, and it seems that it is still in front of me.

However, because this child is not independent in physical movement, and there is the emperor and queen behind him, he has a fortune without working...... The problems of life are taken care of by the red fish, and the social entertainment is done by Yuan Tiangang, who is in his twenties, and he is a young man who is the age of fighting for his ideals, and he has become a child who opens his mouth from the spirit!

"I'm so lazy......" Shu Hui said to herself.

"It can't go on like this. Not only that, but there are many people like me in this world, because they have been working for a long time, and even their souls have begun to decay, and I must save them. ”

"However, these problematic systems have been deeply poisoned, so it's good to set a long-term goal first, and now let's get something that can quickly realize the value of your life." He felt that some kind of mission was driving his actions, but his previous mind was covered with the dust of laziness and turned a blind eye.

"Maybe this kind of mission is called Secondary 2, right? Isn't it a little too early......"

In fact, this is not the second middle school, but Shu Hui's desire to realize self-worth. However, because on the way to growing up, there were too many lofty so-called ideals that were confirmed to be just utopians, so that people in Shu Hui's time were ashamed to even say the word ideal.

Even if you think about it yourself, you will feel that it is in Form 2.

Shu Hui looked at the ugly oil lamp in her hand and made a decision in her heart. Since the masters of Qiongyao have saved nearly half of the cost of night reading for the scholars by virtue of their wisdom, why not put the icing on the cake and give a small gift to the scholars of the world?

Even, Yuan Tiangang and others stayed in office because of their choices, although the imperial court also made compensation, but Shu Hui always felt that he owed something in his heart. If he can compensate in his own way, then of course Shu Hui can't ask for it.

Nowadays, the cost of reading is expensive, books are expensive, and paper and ink are expensive. For Shu Hui, although he is too conceited about the knowledge he carries from the afterlife, he is not blindly arrogant. As long as he is willing, these problems that plague a large number of students can be solved to a certain extent.

What's more, there is also a system that he selectively ignores to sweep the formation?

He decided to go back and do some research on the main costs of acquiring knowledge for scholars, and then carefully plan how to optimize it next.

So he asked Hongyu to take the new fuel-saving lamp given to him by Qiongzhou Thorn History, quit Yuan Tiangang, and went straight out the back door of the county office. Today is just a daily come-by-say hello, nothing else, but Fat Da rubbed a delicate spotted bamboo less than a year old.

Standing at the back door of the county office, Shu Hui was thinking about whether to go to East Street to investigate. Although he has been familiar with many vendors and talented and beautiful people on East Street in the past three years, he has not paid attention to what the market of those cultural goods is.

He thought about it carefully, and finally gave up. If you inquire yourself, it will inevitably be over-interpreted by someone with a heart. If you think that you are interested in the imperial examination, and some people make the wrong vote, wouldn't it be a loss?

He decided to go to Zhang Sange, whom he had just met on Dongjie, who was said to be outstanding in literature and was recommended by Liu Tingshi to study in Chang'an Simen. Shu Hui saw that he had to do some shopping on East Street if he had anything to do, and it seemed that he had a collecting habit, so it was right to look for him.

This will be that Brother Zhang may not have gone back yet, so Shu Hui went back to his house first and asked Hongyu to prepare a small snack for visiting the house.

After all, the friendship is not very deep, how can there be a reason to come to the door empty-handed?