Xia Dacheng and Yang Tiezhu ran to several hospitals in the town, reported the name of the saltpetre, and then the ground frost was numbered.

It's a pity that although people in the hospital know that the ground cream is for medical purposes, it has too few uses, and there is no one in it. There are no medical centers in Luoyun town.

A doctor saw their eagerness and suggested that they go to the county to look for it. After all, Luoyun town is too small. Maybe there will be one in Huaihe county. Xia Dacheng has no choice but to discuss with Yang Tiezhu and ask him to go back to help his family first. He goes to the county, and then he can't go to Yangcheng.

He is also in urgent need of medical treatment, after all, fresh cured meat is now too much to do. If you don't do it for two months, you can earn at least 100 Liang silver a month. What is a hundred taels of silver equal to? It's equal to three rooms. If you build a few more houses, it's equivalent to ten acres of good farmland.

Now that I've heard about this in the hospital, I'll go to a bigger place to ask. Anyway, there are cars. It's just that people work hard.

Yang Tiezhu can't, had to let Xia Dacheng drive a car to the county, and then walked back.

When Yang Tiezhu came back, Lin Qingwan asked him, only then did he know that Xia Dacheng had gone to the county.

Knowing that people in the hospital knew this kind of thing, she was relieved. Since we all know it, we can buy it, but Luoyun town is too remote and small to sell.

Lin Qingwan waited patiently in the room for two days before hearing the news of Xia Dacheng's return.

Xia Dacheng had blackened a lot of his face after this period of time, but this time he came back more swarthy. He gave his things to Lin Qingwan, and then he turned around and went home to have a rest. I've run too many places in the past two days. I'm totally holding up at one breath. At this time, I have to go back and have a good rest.

Seeing that Xia Dacheng didn't mention the value of this thing, Lin Qingwan knew that it must be within the cost range.

She asked Yang Tiezhu to take a small basin and a small water jug, and asked him to fill it with water.

Yang Tiezhu brought things, she opened the small bag Xia Dacheng gave her.

The small cloth bag is not big. It contains some crystalline white objects, about as much as a big soup bowl. In fact, Lin Qingwan doesn't know this kind of thing, but she remembers that several travel novels all say that they are white crystalline objects. Now she can only try them.

She put the jug in a small basin filled with water, and then grabbed a handful of saltpetre and put it into the water. The saltpeter melted quickly in the water.

Yang Tiezhu stupidly stood by and watched his daughter-in-law test there. Seeing Lin Qingwan's dignified attitude, he did not dare to ask why she did it.

After putting saltpetre in the water, Lin Qingwan sat on the side and waited. After a while, she found that the water in the water jar did not freeze.

Is it true that through novels deceive her to read less? Or is this crystal not the kind of saltpeter she said?

She tried to feel the water in the basin and the water in the water jar with her fingers. It really felt cool. When the water came in, she touched it. It was a little lower than the temperature just now.

Is there less saltpeter?

Lin Qingwan grabs a little more and throws it in.

After that, her eyes were fixed on the water. Yang Tiezhu looked at his daughter-in-law's water carefully, and he also kept his eyes on the water jar.

Then he saw a picture that surprised him -

a thin layer of ice was formed on the top of the water in the water tank.

Yang Tiezhu held his breath, and Lin Qingwan also held his breath. After a while, the water in the water tank was frozen.

Yang Tiezhu couldn't believe it. He looked at his daughter-in-law. Lin Qingwan gave him a happy smile, and then he touched the ice in the water jar with his hand.

It's really icy?!

He was too excited to say, "daughter-in-law, what's going on? How can water become ice? "

Can Lin Qingwan tell him that because saltpeter dissolves in water, it will cause the water to cool down rapidly and then make it freeze? Can she tell him that she also read the novel? Certainly not, and he didn't understand.

So she can only make up a mask, "I don't understand this, I used to stay in the big family is like this ice making."

After hearing this, Yang Tiezhu nodded excitedly and then turned to inform others.

Lin Qingwan grabbed him and told him not to worry. He took the water in the small pot to the kitchen and boiled it.

For fear that Yang Tiezhu will not operate, she also followed.

Although Yang Tiezhu did not understand why his daughter-in-law did so, he thought that she must have her own reason, so he honestly started to boil the water. There was not much water in the small pot, so it dried after boiling for a while, and then a layer of powdery crystal appeared at the bottom of the pot.

The appearance of the crystal is the same as Xia Dacheng's saltpetre, but these should be finely broken.

Lin Qingwan was relieved and asked him to scrape off the crystal, fill the small basin with water, put water into a water can, and then put the scraped crystal into the small basin.

Saltpeter can be reused, that is, the water in it needs to be evaporated by distillation, and then the crystal will be scraped off for reuse. Of course, it can't be used endlessly. It will lose some every time, but it is very small.It was not until the success of the second ice making that Lin Qingwan was completely relieved and asked Yang Tiezhu to inform Xia Dacheng to come.

As soon as Xia Dacheng returns to the room and lies down, he is called by Yang Tiezhu. But seeing his cousin's excited appearance, we can see that there must be something wrong.

On the way, Yang Tiezhu tells Xia Dacheng in a low voice about his daughter-in-law's making ice, and Xia Dacheng directly starts to run.

When they came to Yang Tiezhu's house, Lin Qingwan was still sitting at the table waiting for them. On the table was the small water basin and the water pot in the water basin.

Xia Dacheng saw the ice inside at a glance and touched it excitedly.

It's really ice! My God?

Xia Dacheng steadies his excitement and sits down at the table.

"Brother in law and sister come to me to talk about ice?" My voice is a little unsteady.

Lin Qingwan nodded, her eyes were still a little trance. Before they came in, she had been thinking about problems. At this time, she did not return to her mind.

She tapped her forehead with her fingertips and asked, "where did Dacheng get these nitrates? Can I get it? Is it expensive? "

Smart people talk together is easy, Xia Dacheng immediately understand the meaning of Lin Qingwan.

He thought about it in his mind, and then he said slowly, "I bought these ground creams from a big drugstore in the county. It's not a hospital, it's a place where herbs are supplied to all the major hospitals. Thanks to a friend of mine, I was able to buy it there because other people didn't sell it out. It's not expensive. It cost about two liang silver in total. As to whether it is good or not, I asked the shopkeeper in the drugstore. It is said that the amount of this stuff is not too much, so the stock is very small. What I took back is almost all the stock in their drugstore. Therefore - "

therefore, it is not advisable to make money by making ice. Even if Xia Dacheng didn't finish speaking, Lin Qingwan understood his meaning.

She sighed slightly, and said: "it's OK. After this lesson, we'll dig an ice cellar to store ice in winter for the next year. This method can only be used for emergency."

Xia Dacheng nods, and he has the same idea.

But --

"sister in law, can this ice support us to store fresh cured meat When he said this, Xia Dacheng jumped.

How can he forget that it takes a lot of ice to store fresh cured meat. What can such a small pot do.

Lin Qingwan glanced at the water jug in embarrassment and nodded.

"I should be able to. I'll think about it again."

After Xia Dacheng put down his mind, he went back.

Lin Qingwan said that he was tired and wanted to lie down for a while. He told Yang Tiezhu to go to carpenter Cui to make some wooden boxes. He didn't need to look good. As long as it was strong and sealed, he could make it as soon as possible.

After Yang Tiezhu helped his daughter-in-law to lie down, he went out to find carpenter Cui.

Carpenter Cui was also quick. After listening to Yang Tiezhu's statement, he drove out two wooden boxes the next day. Without even painting, it was a square box with a lid and clasps on it.

Yang Tiezhu brought it back to Lin Qingwan, who was very satisfied.

She also took out several small bags that she made for the baby. The small bags were small, and one bed was just padded in. She simply put two more beds in, and then put the bowls of ice she made in the morning, even the whole bowl with ice into the box. After putting it in, I don't worry. There are two small covers on it.

Fortunately, she was busy at the beginning. She always felt that she didn't have enough things to make for her children. She made 5 or 6 beds of quilt, which is of great use.

Lin Qingwan put the box on top of it. Seeing Yang Tiezhu's curious appearance, he also told him not to move it. She'll see it again at noon.

Although Yang Tiezhu was curious, he also listened to his daughter-in-law and did not do anything to watch.

After lunch, Lin Qingwan opened the box and had a look.

awesome, awesome, and the ice inside is more powerful, and no awesome trace.

She put the bag in place and covered the box again. Yang Tiezhu, who was watching by the side, was stunned, but also knew that it was about the preservation of fresh cured meat. He didn't come here curiously and uncover it for a while.

In the afternoon, Lin Qingwan came to have a look. At this time, the ice began to melt. There was a thin layer of water on the bowl, but there was still a lot of ice.

By the end of the night, she came to see that the ice in the box still showed no sign of melting significantly, so she was really putting her heart down.

Yang Tiezhu is also nearby.

At noon, he just guessed, but he thought for a long time without any conclusion. It was not until this time that he understood the meaning of his daughter-in-law.

"Daughter in law, how do you know if you put it in a box and cover it with a quilt, you can slow down the speed of ice melting?" Yang Tiezhu was so excited at the moment that he thought all this was wonderful. Should not be more cover more hot, melt faster?

Lin Qingwan's heart rolled a white eye. Could she tell him that when she was a child, she saw people selling popsicles with wooden boxes with quilts in them to keep warm? Later, with bubble boxes, the old ones were replaced. But then the fridge freezer was widely promoted to become a cheap item, and then even the foam box was eliminated.Heat preservation can not only keep high temperature, but also keep low temperature. There is no foam box here, but the principle is the same. It's nothing more than sealing and heat preservation.

You can't tell yourself the truth about a man. You can only tell him that she used to stay in a big family. Then he pretended to be impatient and urged him to ask carpenter Cui to drive out the wooden box, and then all the sewing women at home would quickly take some cotton cloth and make some quilts.

Her doll's quilt was only taken out to test, but there was no plan to contribute. After all, these fabrics are good materials. It's good to use some poor fabrics to make small quilts for heat preservation.

As Yang Tiezhu scratched his head, he thought that the family where Wan Wan had stayed before was so powerful that he could do anything. At the same time, he kept busy at his feet.

Several women in the family, one afternoon and one night, rushed out a pile of small quilts. In the middle, Yang Tiezhu also went to the town to buy a pile of coarse cloth and cotton back, here will not describe one by one.

Yang Tiezhu was busy outside and came back busy making ice. Lin Qingwan explained the middle steps clearly to him, so he was very smooth.

Now the tools are simple. The basin for holding water at home is too small. He can only make a few bowls of ice at a time.

Lin Qingwan didn't remind him this time, but he was almost enlightened. He decided to wait for carpenter Cui to finish his wooden box and ask him to make some bigger wooden pots. It doesn't need to be too deep or shallow, as long as the area is large enough to put more ice bowls. But when he thought about it, he thought it was not good to use a bowl of ice

Thinking about him, he went to take the "calligraphy board" that Lin Qingwan had made for him, and found a charcoal to draw on it.

After sleeping in the room for a while, Lin Qingwan found that her man had not come back to sleep. Seeing that there was light in the main room, she got up and walked over. Far away to see Yang Tiezhu a very serious small model, holding the board in writing and painting.

She curiously looked closer, only to find that Yang Tiezhu in the board to spend a few patterns. One is a square big frame, a square small frame, and the other is a big circle with a small circle. His strokes are very strange, and the shapes he draws are also crooked. However, Lin Qingwan can see the general shape of his paintings.

Lin Qingwan stood beside him for a long time before Yang Tiezhu reacted.

"Why, daughter-in-law, why don't you sleep? Why are you standing here?" Yang Tiezhu put down the board and charcoal in his hand, looked at his hands black, and quickly picked up the next cloth to wipe.

"I don't see you coming back to sleep. I'm just thinking about what you're doing? What are you drawing? " Lin Qingwan raised his chin at the board.

Yang Tiezhu scratched his head with a red face and laughed, "I think our frozen pots and bowls are not convenient, so I want to ask carpenter Cui to make them again. But how can he know what to do if you don't talk to others

Lin Qingwan nodded with a smile in her eyes.

Good boy, know how to invent tools.

"Then go on thinking. I'll go to bed first. Don't delay it too late." With that, he turned back to the room with his stomach up.

Man, you still don't beat him too much, although she already has the image of the object in her mind. However, since he tried so hard to use his own brain to think, let him think. She can't be a daughter-in-law. Everything runs in front of him. It's not too bad for men's self-esteem?! It's better to move your brain more frequently. You'll be more flexible after you move more.

Yang Tiezhu didn't feel his head until he heard that his daughter-in-law was lying down on the Kang.

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