No Regrets In Flourishing Tang

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Under normal circumstances, the energy value of coal is 2 3 times that of firewood, and the old 100 surnames may feel more than 3 times when they are used. Therefore, unless the price of firewood is less than one third of coal, the old 100 surname will only Choose to buy firewood. If the price of firewood is higher than one third of coal, the old 100 people will choose to buy coal.

When the traffic was not good before, the price of coal from distant places had to be multiplied many times, and the local firewood price was low, only 10% of the coal. Therefore, the old 100 people naturally prefer to burn firewood, only economic conditions Good rich people will choose to burn coal. After all, the smoke from coal burning is relatively small and relatively hygienic. The smoke from burning wood is very large and it is easy to choke people. The use of coal is naturally a face-saving thing. Rich people It is more self-willed, and there is no shortage of people who use white wax as firewood. Moreover, coal is much cheaper than white wax. Fortunately, there are no paper banknotes in this era. Otherwise, it will not be nothing to directly use paper money as firewood. Strange things, for the rich local tyrants, toss about everything.

At this moment in Chang’an City, because the transportation is so convenient, the coal in the distance can be transported more easily. The freight is much more efficient than the previous carriage, and the freight is naturally greatly reduced. Naturally, the price also decreases, and as the population increases, many of the surrounding forested wasteland has become slums, and these poor people also need to burn water to cook, so the surrounding trees will be cut down a lot, if you want to get the ideal For firewood, we must continue to go further to cut wood, and in this way, the price of firewood must increase, because the cost of cutting wood increases, and the selling price must increase.

With this trade-off, the price of firewood has almost reached the one third of coal, and once the price of firewood breaks through the third of coal, the old 100 people will not buy it, so many woodcutter ca n’t do it anymore. To switch to something else, under the squeeze of coal, it is hard to see the firewood hawkers on the market in Chang’an City.

Of course, I can still see some of them occasionally. There are some people who really have no other ability to make a living. Except for cutting wood and being a woodcutter, they ca n’t do any other work at all, so it is also a helpless thing, especially for some old people. In addition to chopping and checking firewood on the barren hills, the elderly will not do anything else. After accumulating for many days and waiting for more firewood, they will use flatbed trucks to sell them in the suburbs of Beijing. Although the income is very small, but You can also change some oil and salt. In addition, in the mountains, you can not only pick up firewood, but also pick up some fungus mushrooms and the like. These can also be sold together in Beijing. The wood is not valuable, but these fungus and mushrooms, because they are wild It’s still a good price. For the elderly who are not demanding, it is enough to earn a little money to make up for the family. It is better than not earning a point.

“These all are the northern coal bought from outside the city. They are the best quality anthracite, which burns for a longer period of time. Moreover, there is almost no smoke. It is most suitable for use in the school.”

Li An said.

In fact, it does n’t matter much if there is smoke, and it wo n’t have much effect on the teaching of the school, but the thick smoke column will always feel strange when viewed from a distance. This is a school and not a restaurant. It ’s full of culture. In the breath of the school, there should not be thick smoke, which will destroy the overall atmosphere of the school, so it is better to use anthracite.

The coal commonly used in Li An ’s home is the highest quality anthracite, and it is all intact coal, which is the highest standard coal. The same anthracite, if there are only broken slag, it will still produce some smoke, and the smaller the coal , The more smoke will be generated, after all, when coal is burning, it will release huge heat, and this heat can blow the coal dust that has not yet been burned out of the chimney.

A large amount of coal dust that has not yet been burned is blown out of the chimney, and naturally thick black smoke is formed. These black smoke are coal dust and a very annoying pollutant.

China ’s modern fleet ships, because they used coal dust, were found by pirate warships at a very distant location, and lost their opportunities. This is enough to prove that the coal with more coal dust produces smoke. There are many, and the combustion efficiency is relatively low. High-quality coal must not only be of good variety, but also must be piece by piece. Too crushed and coal dust are both bad and worthless.

The price difference between the same weight of coal and coal dust is very large. In order to reduce the waste of resources, under normal circumstances, coal dust is mixed with water and clay, so that when it is burning, it is not easy A lot of smoke was produced.

The appearance of the merchants sold by later generations resembled lotus root coal. In fact, it was formed after the worst coal briquettes were mixed with clay, and then the honeycomb was injured. The high-quality coal blocks will never be used as lotus-style coal. Only coal scraps that no one wants are used for this.

At this moment, since the chefs are still washing and choosing dishes, the fragrance at not all in the dining room will be revealed, but just wait a few more hours, and the very delicious aroma will be emitted from the dining room. Well, it depends on Yan Ruyu and they are interested in staying in the school for so long.

The dining hall is large and the interior is very clean. Every time the children finish their meals, the staff of the back kitchen will clean it immediately, so that the dining hall can always be kept clean and clean.

In order to allow children to develop the habit of saving food, a large number of calligraphy and paintings are posted on the pillars of the canteen. The hoe is on the day of the day, the sweat drops on the soil, and such verses are posted everywhere, and because of these The children have not yet learned the writing, so the background of these writings are all the pictures in the background, and they ca n’t understand the words. As long as they see the pictures, they can understand the meaning of the poem.

In short, this dining hall is not only a place to eat, but also has a cultural atmosphere.

“It’s so big here! With so many tables, let me count them.”

Li Ya’er reached out and counted for a long time, and said: “It’s probably more than 100, certainly less than 200. A table can sit up to 8 to 1000 children. So, 1 people are really enough.”

“There are so many poems in the canteen. These children are also pitiful. When they eat, they must not forget to learn.”

“I heard that Husband has prepared a lot of 3 meals a day for all children. When will lunch be ready? I want to try it.”

“What time is it, is it still early? At least one more hour is needed to start the meal. If you want to wait, wait slowly!”

“It’s okay anyway, just wait, but Husband is afraid he won’t be able to wait with us. He still has something to do.”

Said everyone.

Li An nodded and said: “Yes, I will go to the Research & Development Center for a while, but you can come back at most within one hour. If you have nothing to do, you may as well rest here! The school is so big, as long as it does not affect the children ’s lessons. “

After accompanying them to the 2nd floor, Li An left Mass Communication School. The establishment of the school is very important, but Li An will never forget his forced life. Imperial Court attaches great importance to the Thousands of Miles Sound Transmission Project, although it has been It is possible to pass the message to a far place, but it must be a rigorously trained person to master this technology, so it is not very convenient, they are eager to talk directly with people other than ten thousand li, they are extremely eager This technology.

After paying a huge amount of manpower and material resources, Li An will face a lot of pressure if this achievement is delayed, so every day will go to the Research & Development Center to urge the technical talents cultivated by themselves and let them follow their own Train your thoughts to carry out various experiments and try to overcome this problem as soon as possible.

“Minister Li, Wifes …”

Li Chuandao saw Li An was about to leave, but a dozen cross-dressers did not leave, so I wanted to ask how to entertain.

Li An said, “You are busy with you! Don’t worry about them, This Official will come back within an hour, and will have lunch here.”

“Yes, I understand.”

Li Chuandao nodded and said.

The most talented people in the Research & Development Center are now running for the Thousands of Miles Sound Transmission Project. Various experiments are constantly being tried, and periodic results are constantly emerging. Overall, it is still very good Li An is satisfied that it is really difficult to achieve such results in such an era.

“Minister Li, the iron piece you want is done. This thin iron piece will really make a clear sound under the action of the magnet. Blowing against the iron piece will have the same effect.”

A technical talent said happily.

Li An tried it, and gently blown it, and the iron piece really made a crisp sound. This sensitivity made Li An quite satisfied. This is also a good result. The sound transmission plan has taken another step forward.

“Yes, much better than before. Put these irons on to see if you can talk.”

Li An said.

It is not an easy task to change the iron piece of the device. The original iron piece is fixed very tightly. If you want to replace it, you must get it slowly. Although it is not difficult, it requires a lot of Time, a few hours is still needed.

This thin piece of iron is the part of the microphone that Li An needs. The quality of this piece of iron will directly affect the effect of sound transmission. The better this part is made, the higher the quality of sound transmission.

For the convenience of the experiment, the two phone prototypes are equipped with batteries, and they are connected by a cable that is several hundred meters long. Outside the hundred meters, they talk lightly, and others ca n’t hear them, so they can be very good. Test the effect of the phone.

When I experimented before, in fact, I can already hear the sound. However, because the parts are not qualified, almost all of the noise is heard. Such a garbage effect, naturally there is no need to repay, otherwise, not only will not be exciting On the contrary, it will make people think that Li An is a liar, and the phone is a useless junk.

Li An ’s minimum standard for phone calls is that must be able to hear clearly what the other party said. It must be relatively clear. Phone calls that do not understand the voice will only make people feel crazy, and many people in the future generations can see the phone when they drop the phone. come out.

In addition to Thousands of Miles Sound Transmission, there are many more researches being carried out by the Research & Development Center, but most of them are improvements based on the original ones, perfecting the good things invented by Li An, which is also in line with Li An It means, after all, there are a lot of things invented in a hurry, and there are still many imperfections. It is also a very good idea to improve these results.

After a round of mentoring, Li An watched the time and left the Research & Development Center to visit Mass Communication School.

As the time was approaching noon, Li An just entered the door of the school and smelled a very rich meat scent, but not the braised meat, but the mutton smell, which is also slightly scented with coriander The taste, even a touch of wine.

There should be no alcohol in the food for children, but it is not a problem to add a little cooking wine to the dishes. Cooking wine is not spicy wine, it will not cause any harm to children, it will only make the dishes more delicious.

“Minister Li, Wifes reading in the library?”

Li Chuandao estimated that Li An should come back, so, waiting in advance at the gate, he has no teaching tasks now, every day is not very busy.

“Okay, go busy!”

Li An laughed, walked into the library.

“Yo, they all look so interesting, are they so beautiful?”

As soon as Li An entered the door, he noticed that everyone was reading books seriously. An’an quietly didn’t have a slight voice, and it was inevitable that he would feel a little surprised.

“Is it all an hour? So fast.”

Obviously, I was fascinated by reading, and I felt that time passed quickly.

“It’s stupid, don’t you smell anything?”

Li An said.

“Lamb stew with parsley and mushrooms, so fragrant!”

“There are cooking wine, fish balls, sesame oil.”

“I still smell the fragrance of bean sprouts.”

“That should not be the taste of a dish.”

“Is it time to eat?”

A group of people said at once talking at once.

Li An said with a smile: “The time for dinner has not yet arrived, but it should be fast, at most one minute, the children are out of class, we are not going now, we will have leftovers.”

“What are you waiting for, hurry up!”

“The air on the second floor is better. Let’s go to the second floor! Let’s lean on the window.”

“Okay, I’m hungry. Let’s eat some food first!”

Said everyone.

The environment of the second floor of the dining hall is indeed better than the first floor, because the children are mostly on the first floor in order to save trouble, and 2-Layer will have at least half of the vacancies, so the natural environment is better.

“I have also spent more than one hour in the school. How does it feel? Mass Communication School is much better than you think!”

Li An looked towards Yan Ruyu, asked.

The purpose of letting them come to visit is to persuade them to let Tang’er come to study here. At this moment, seeing that they are all satisfied, it is natural to hit the iron while hot.