Under normal circumstances, the energy value of coal was two or three times that of firewood. However, when people used it, they might feel that it was more than three times. Therefore, people would only choose to buy firewood if the price of firewood was less than one-third of that of coal. If the price of firewood was more than one-third of that of coal, people would choose to buy coal.
Only the rich people with better economic conditions would choose to burn coal. After all, the smoke from burning coal was relatively small and was relatively hygienic. On the other hand, the smoke from burning firewood was very large and could easily choke people. Using coal was naturally a more dignified thing. Rich people were more willful. There was no lack of people using pewter as firewood, not to mention coal, a fuel that was much cheaper than pewter. Fortunately, there was no paper money in this era. Otherwise, it would not be strange to directly use paper money as firewood. For rich people, no matter what, it would not be strange to directly use paper money as firewood. For rich people, no matter what, it would not be strange to directly use paper money as firewood. For rich people, no matter what, it would not be strange to directly use paper money as firewood.
At this moment in Chang 'an City, the transportation was much more convenient. This made it easier to transport coal from afar. The transportation was much more efficient than before when it was transported by horse carriage. Naturally, the transportation cost was greatly reduced, and the selling price was naturally lower. With the increase of the population, many of the surrounding wastelands, which were originally overgrown with trees, became slums. These poor people also needed to boil water and cook, so a lot of the surrounding trees had to be cut down. If they wanted to get the ideal firewood, they had to continue to go to further places to cut firewood. In this way, the price of firewood would inevitably increase because the cost of cutting firewood increased, so the selling price would also increase.
As a result, the price of firewood almost reached one-third of that of coal. Because the price of firewood exceeded one-third of that of coal, people would not buy it. Therefore, many woodcutters could not continue to be woodcutters and could only change their profession. Under the pressure of coal, it was very difficult to see hawkers selling firewood in the market of Chang 'an City.
Of course, one could still see some occasionally. Some people really had no other ability to make a living. They could not do anything at all except chop firewood and be woodcutters. Therefore, there was nothing they could do. Especially some old people, who did not know how to do anything except chop firewood in the barren mountains. After accumulating firewood for many days, when they had more firewood, they would use a flatbed cart to sell it in the suburbs of the capital. Although the income was very little, they could still exchange it for some oil and salt. In addition, not only could they pick up firewood in the mountains, but they could also pick up some fungus and mushrooms. These could also be brought to the capital to sell. Wood was not valuable, but these fungus and mushrooms, because they were wild, could be sold at a good price. For the old people who did not have high requirements for life, it was enough to make a little money to supplement their family's expenses. It was better than not making a penny.
"These are the northern coal bought from outside the city. They are the best anthracite coal, which can burn for a long time. Moreover, there is almost no smoke. It is most suitable for use in schools."
Ang Lee said.
In fact, the smoke did not matter much. It would not have much impact on the teaching of the school, but the thick smoke column looked strange from a distance. This was a school, not a restaurant. In a school full of cultural atmosphere, thick smoke should not come out. It would destroy the overall atmosphere of the school. Therefore, it was better to use anthracite coal.
The coal that Ang Lee usually used at home was the best anthracite coal. Moreover, they were all intact coal pieces of the highest standard coal. The same anthracite coal, if there were only slag, would still produce some smoke. The smaller the coal, the more smoke would be produced. After all, when coal was burned, it would release a lot of heat, and this heat could blow the unburned coal pieces out of the chimney.
Large amounts of unburned coal pieces were blown out of the chimney and naturally formed thick black smoke. This black smoke was coal dust, and it was also a very annoying pollutant.
In the modern era, the ships of the Chinese fleets used coal. Therefore, they were discovered by the Wokou pirates from afar and lost the initiative. This was enough to prove that coal with a lot of coal would produce a lot of smoke, and its combustion efficiency would be lower. Not only did high quality coal have to be of good quality, it also had to be in pieces. If it was too fragmented, it wouldn't be good, and it wouldn't be worth a lot of money.
The same weight of coal and coal dust would have a huge difference in price. In order to reduce the wastage of resources, coal dust was usually mixed with water and clay. This way, when it was burned, it would not easily produce a lot of smoke.
Later generations of merchants sold coal that looked like a broken lotus root. In fact, it was formed by mixing the worst quality coal dust with clay and then hitting a beehive. High quality coal dust would never be used to make coal that looked like a broken lotus root. Only coal dust that no one wanted would be used to make coal that looked like a broken lotus root.
At this moment, because the chefs were still washing and selecting the vegetables, there was not the slightest bit of fragrance coming out of the dining hall. However, they only needed to wait for a few more hours before the dining hall would emit a very tempting and delicious fragrance. This would depend on whether Yan Ruyu and the others were interested in staying in school for such a long time.
The dining hall was very big and the interior was very clean. Every time the children finished eating, the kitchen staff would immediately clean up. This was why the dining hall was always clean and tidy.
In order to let the children develop the habit of saving food, a large number of calligraphy and paintings were pasted on the pillars of the dining hall. Poems like "Hoeing the grain at noon, sweat dripping down the grain into the soil" were pasted everywhere. Because the children had not learned to read, the background of the words were all pictures. Even if they did not understand the words, they would be able to understand the meaning of the poems by looking at the pictures.
In short, this dining hall was not only a place to eat, but also had a rather cultured atmosphere.
"This place is so big! There are so many tables. Let me count. "
Li Ya 'er stretched out her hand and counted for a long time before saying, "About a hundred, definitely less than two hundred. A table can sit at most eight to ten children. So, a thousand people is really enough."
"There are so many poems pasted on the dining hall. These children are so pitiful. They can't even forget to study when they eat."
"I heard that my husband prepared three sumptuous meals for all the children. When will lunch be ready? I want to try it."
"What time is it now? It's still early. It will take at least two more hours for lunch to be ready. If you want to wait, then wait! "
"Anyway, there's nothing to do. Let's wait. However, I'm afraid my husband can't wait with us. He has something else to do."
Everyone said.
Ang Lee nodded and said, "That's right. I still have to go to the research and development center later. However, I'll be back in two hours at most. If you have nothing to do, why don't you rest here? The school is so big. It's fine as long as you don't disturb the children's classes. "
After accompanying them to the second floor, Ang Lee left the school. Although establishing a school was very important, Ang Lee could never forget his urgent mission. The imperial court attached great importance to the Ten Thousand Mile Sound Transmission Project. Although it was now possible to transmit messages to very far places, only people who had undergone strict training could master this technology. Therefore, it was not very convenient. They desperately wanted to be able to communicate directly with people thousands of miles away. They desperately wanted this technology.
After investing a lot of manpower and resources, Ang Lee would face a lot of pressure if this result could not be achieved. Therefore, he had to go to the research and development center every day to supervise the technical talents he had personally trained. He had them follow his own ideas and carry out all kinds of experiments, striving to solve this problem as soon as possible.
"Assistant Minister Li, the madams …"
Li Chuandao saw that Ang Lee was preparing to leave, but the dozen women dressed as men did not. Therefore, he wanted to ask how he should entertain them.
Ang Lee said, "Go about your business! Don't worry about them. This official will be back in two hours and will have lunch here. "
"Yes, I understand."
Li Chuandao nodded.
The most skilled talents in the research and development center were now running around for the Ten Thousand Mile Sound Transmission Project. All kinds of experiments were constantly being carried out, and in-progress results were constantly emerging. Overall, Ang Lee was very satisfied. It was really not easy to achieve such results in this era.
"Assistant Minister Li, the iron sheet you wanted is done. This thin iron sheet will really make a crisp sound under the effect of the magnet. The effect is the same when blowing on the iron sheet."
A technical talent said happily.
Ang Lee tried it. When he blew on it gently, the iron sheet indeed made a crisp sound. Ang Lee was quite satisfied with this sensitivity. This was also a good result. The Ten Thousand Mile Sound Transmission Project had taken another step forward.
"Not bad, much better than before. Replace these iron sheets and see if you can communicate."
Ang Lee said.
It wasn't an easy task to change the iron plate for the equipment. The original iron plate was fixed very tightly. If one wanted to change it, it would have to be done slowly. Although it wasn't difficult, it would take a lot of time. It would take a few hours.
This thin iron sheet was the part of the transmitter that Ang Lee needed. The quality of this iron sheet would directly affect the sound transmission effect. The better the part, the higher the quality of the sound transmission.
For the convenience of the experiment, the two telephone prototypes were installed with batteries. They were connected by a wire that was hundreds of meters long. Outside of a few hundred meters, people could not hear what they said. Therefore, it was very good to test the effect of the telephone.
In the previous experiment, they could already hear the sound. However, because the parts were not qualified, they could only hear the noise. With such a trashy effect, there was naturally no need to announce the good news. Otherwise, not only would it not make people excited, but it would also make people think that Ang Lee was a liar and that the telephone he made was a useless piece of trash.
Li An's minimum requirement for a phone call was to be able to clearly hear what the other party was saying. It had to be relatively clear. A phone call that couldn't be heard clearly would only drive people crazy. This could be seen from how many people smashed their phones in the future.
In addition to the Ten Thousand Mile Sound Transmission, there were a lot of research being done in the R&D Center, but most of them were improvements on the original foundation. They were perfecting the good things that Ang Lee had invented. This was also in line with Ang Lee's intention. After all, many things were invented in a hurry and there were still many imperfections. It was also a very good idea to improve these results.
After a round of guidance, Ang Lee saw that it was almost time, so he left the R&D Center and went to the Telepathy Hall to take a look.
Since it was close to noon, Ang Lee had just entered the door of the school when he smelled a very strong meat aroma. However, it was not the aroma of braised pork, but the aroma of mutton. There was a slight fragrance of coriander in the aroma, and even a touch of wine.
By right, there should be no alcohol in the food for children. However, there was no problem with adding a little cooking wine to the dishes. Cooking wine was not spicy wine, so it would not cause any harm to the children. It would only make the dishes more delicious.
"Assistant Minister Li, the ladies are reading in the library."
Li Chuandao estimated that Ang Lee should be back, so he waited at the gate in advance. He did not have teaching tasks now, so he was not very busy every day.
"Okay, you go and do your work!"
Ang Lee smiled and walked into the library.
"Yo, you're all so interested. Is it really that interesting?"
As soon as Ang Lee entered the door, he found that everyone was reading seriously. It was quiet and there was no sound at all. He could not help but feel a little surprised.
"It has been an hour? So fast. "
Obviously, they were fascinated by the books and felt that time passed very quickly.
"Are you all dumbfounded? Don't you smell anything?"
Ang Lee said.
"Stewed mutton with coriander and mushroom. It smells so good!"
"And cooking wine, fish balls, sesame oil."
"I also smell the fragrance of bean sprouts."
"That shouldn't be the smell of a dish."
"Is it time to eat?"
A group of people talked at once.
Ang Lee said with a smile, "It's not time to eat yet, but it should be soon. At most, there is still a quarter of an hour before the children are dismissed. If we don't go now, we will have to eat leftovers."
"Then what are we waiting for? Let's hurry up!"
"The air on the second floor is better. Let's go there! We want to sit by the window. "
"Okay, we are all hungry. Let's go and eat first!"
Everyone said.
The environment on the second floor of the cafeteria was indeed better than the first floor because most of the children were on the first floor to save trouble. At least half of the seats on the second floor would be empty. Therefore, the natural environment was better.
"You have been in the school for more than two hours. How do you feel? The School of Telepathy is much better than you think!"
Ang Lee looked at Yan Ruyu and asked.
The purpose of letting them visit was to persuade them to let the Tang Er study here. At this moment, seeing that they were satisfied, he naturally wanted to strike while the iron was hot.
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