I was engaged in infrastructure construction in the Han Dynasty [Transmigration Book]

saltpeter?

While thinking about the relationship between saltpeter and ice, Bi Gao asked someone to bring the saltpeter over.

Liu Tan asked for water to be fetched again, some were boiled water, and some were raw water.

After putting the boiled water into a small copper basin, he put part of the saltpeter in the large copper basin. After carefully placing the small copper basin in the large copper basin, he began to slowly pour water into the large copper basin.

When saltpeter dissolves in water, it will absorb a lot of heat, and the water in the small copper basin will cool down quickly, but whether it can freeze or not depends on the ratio.

Liu Tan didn't know how much to mix, but this thing was better than others.

He had people prepare a lot of saltpeter. As the saltpeter in the large copper basin was completely dissolved, the water in the small copper basin gradually began to form ice balls, then a mixture of ice and water, and finally turned into ice.

Almost all of this happened under the watchful eyes of everyone. Bi Gao stared straight at him, and he couldn't help muttering: "This must be a fairy art."

Liu Tan looked at him helplessly and didn't bother to explain. He could only tell the other party that saltpeter dissolved in water would absorb heat, but at the same time he had to explain what heat is and why it takes away heat.

To be honest, Liu Tan knew the result, but he couldn't explain the principle part.

Just let these people misunderstand.

He asked people to record the total amount of saltpeter and the total amount of water, calculated the ratio, and then asked the people below to make ice according to this ratio.

As for his little bit of ice, he just studied how to make smoothies.

According to the current productivity, the easiest way is probably to chisel it by hand, but the problem is that manual work also has various problems.

First of all, unless it is chiseled in an ice cellar, if it is slow to chisel, then wait for it to turn into water.

The second is that it is difficult to avoid touching hands when chiseling by hand. He can ask the person who made it to wash his hands, but he can't pass that test in his heart.

Not to mention that the food is also handmade, at least there is no raw food these days, and there should be no chef who insists on putting his hands in the pot to rinse.

Liu Tan rubbed his chin and said suddenly: "It seems that the reamer I got earlier should be useful."

Bi Gao was a little confused: "What reamer?"

"It's the thing that was specially made to crush straws for briquettes." Liu Tan used it for the people below. If he hadn't suddenly remembered the ice crusher just now, he would not have remembered this thing.

But thinking about the reamer, it seems that it is not suitable. The really suitable one is the shaving ice machine.

It is definitely not possible to do it electric, but the manual one is not difficult at all, just get a drum, place an ice skate obliquely under the drum, install a screw pressure plate on the top, and install a rotating handle on the top.

Pour the ice into the drum, and then rotate the handle to control the disc below to rise or fall. When it descends, it exerts pressure on the ice cubes on the opposite side. At the same time, there are spikes at the bottom of the disc to fix the ice cubes and drive the ice cubes to rotate. .

Probably the most difficult part of the whole ice shaving machine is the auger on the top.

And the so-called screw rod needs to be controlled by a spring. Fortunately, something like a spring has been made before, but it is not as large as the pressure coefficient that the later generations can withstand.

This thing is too simple, and there is not even room for improvement. Liu Tan simply asked his carpenter to make one instead of looking for the Gongshu family.

After finishing it, he tried it himself and found that the effect was not bad. Because the whole ice shaving machine is made of wood, it looks quite fun.

On a whim, Liu Tan asked someone to make a new one. The cover on the top was made into a circular arc shape and two round ears were added, and then the whole was painted in black and white. Also strangely cute.

Liu Tan looked at this and said, "Choose the best wood and make another one."

Bi Gao was a little surprised: "This is not enough?"

"No, this is too big."

Because it was estimated that many people would be served, this shaving ice machine was made quite large in order to be able to produce a lot at one time.

However, after making it into a panda shape on a whim, Liu Tan suddenly felt that this thing should be quite fun.

Thinking about how his father can play with the toilet for a long time, he should be very interested in making shaved ice by himself, so he just made a few more small ones and made them into different shapes, so he can choose whatever he wants.

Even other people who came with Liu Che can also play, so they have to make it smaller, without animal shapes, and simple, to distinguish it from Liu Che's.

Liu Tan even began to think about whether to use Dunhuang jade to make one, but after thinking about it, this thing is considered everyday, and jade is still relatively fragile. Wouldn't it be a disappointment if it were broken?

So if you don’t use Dunhuang jade, you can only start in other places, such as inlaying gems, using black gems for rolling eyes, and then using special techniques to draw a plush texture on it.

In this case, he has to come by himself.

Liu Tan also never expected that he, a painting scum, could show off his painting skills after time travel.

After the finished product was finished, the value of the ordinary shaving ice machine suddenly rose. At the same time, Liu Tan felt that he had found a new way to make a fortune.

The temperature in some parts of the northern border country is not high in summer, but the average temperature in other parts of the country is not high, but the temperature difference between day and night is large.

Dunhuang is located in this part of the area, shaved ice is still a very good way to relieve the heat, and the most important thing is that the cost is low!

Now there are also ice sellers outside, but not to mention that it is not edible, and the price is also very high. Most of it is stored by ordinary people in winter and bought for a little more income in summer.

Liu Tan calculated the price and found that even if the price of his shaved ice was set higher, someone would definitely buy it, not to mention that the shaved ice is not just ice, but also has sweet and sour jam poured on it.

Among these things, the most expensive is jam, because it contains sugar.

Of course, the jam made with white sugar must be used for Liu Che. If he sells it, he will use caramel sugar. In order to save costs and keep the price down, the price is too high and few people can afford it.

Liu Tan had no inspiration for the time being after finishing the shaved ice, so he decided to deal with business to change his mind.

As a result, when he was processing the paperwork, he saw that the recent financial expenditure included the construction of a dam, so he couldn't help asking, "How is Xu Lin's eyes resting?"

Xu Lin's eyes were caused by long-term malnutrition, and it certainly won't be cured overnight, but as long as it improves, it proves that there is hope.

Zhu Shanyi was stunned for a moment before saying, "This... this... I don't seem to have heard what Mr. Xu said."

Liu Tan put down the paperwork in his hand and said cheerfully, "Then let's go and see him."

Well, skipping work openly in the name of caring for his subordinates.

Zhu Shanzhang was silent for a while and ruthlessly shattered his thoughts: "Messenger Xu has left the capital for more than half a month."

Liu Tan was taken aback: "What did he go to do?"

Zhu Shanchen said in a low voice: "Message Xu said he wanted to build the dam as soon as possible, and if we delay it, we will miss the farming season."

Liu Tan was a little helpless: "One more and one less will not have that much temporary impact, forget it, let him go as he likes."

He can somewhat understand Xu Lin's thoughts. It is nothing more than the fact that he has learned knowledge for so many years, and the dream he has persisted in for so many years will finally come true. He will naturally be full of enthusiasm. After this period, it will be better. up.

But when it comes to this, Liu Tan has a new idea: Does he want to get some water games?