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

To be honest, the toilet should be simpler than anything he's made before, at least he doesn't have to make some by-products first.

Well, it should be.

Liu Tan took a charcoal pencil and drew the general shape of the toilet on the paper first, and then the arrangement of the internal water channels.

He thought for a long time between the vortex siphon and the jet siphon. According to the theory, the jet siphon is better, but the vortex siphon is definitely better in terms of saving water resources.

After hesitating for a while, he thought about how to get out both. Anyway, the jet siphon was originally a jet side channel added to the vortex siphon.

So if you want to engage in a jet siphon, you must first get out the vortex siphon.

In fact, the pipeline of the siphon toilet is not difficult to design. The first is the water hole, which is the easiest. It is connected to the water tank, and then goes around the whole toilet. There are many small holes in the middle, and then the sewage pipe below, also known as water. The seal is a curved shape, it really looks like a human ear.

After designing all these, Liu Tan didn't rush to start the flushing device of the water tank, but let someone build it according to the cross-section.

It's just that when building it, I encountered a very serious problem-what material to use.

According to the current materials for toilets, wood is generally used, but Liu Tan has traveled around the northern border country, and he will feel distressed wherever wood is needed - there is no way, the northern border country has little wood.

And if it is really popularized, the nobles must use very good wood extravagantly. If there is such a thing as using red sandalwood as a toilet, even if Liu Tan is rich, he will still feel distressed!

So he subconsciously wants to make ceramics. After all, it is better to use ceramics in later generations. No matter how expensive ceramics are, they are just fired with kaolin. The difference is the artificial aspect.

In fact, ceramics in this era already had the simplest original porcelain, but it was not used much because it was not good-looking. The nobles detested ugliness, and it was not as cheap as pottery for common people, so the development was very slow.

However, one of the biggest reasons for the roughness of the original porcelain is that the firing temperature is not high enough.

Think about it, what was the fuel used in the past?Firewood, the conditions required to achieve high temperatures are too harsh.

So Liu Tan never thought about improving ceramics, but now it's different, he found coal.

Coal can provide more heat than firewood, so firing ceramics will become much easier.

Liu Tan asked someone to get him a copy of the original porcelain production method to see how it would evolve on this basis.

It has to be said that it is much easier to evolve something with a basic form than to create something out of nothing.

Because many things Liu Tan only knows a shape and a simple principle, those basic things have to be tried a little bit, this process is actually a waste of time.

Of course, it is much better than groping without knowing the purpose, but it is not as good as it is now.

For example, the steps of washing, drawing, printing, sharpening, drying, and engraving of primitive porcelain are actually no different from those of later generations of porcelain.

Maybe there are some differences in the techniques, but... Liu Tan can't tell it!

His deepest understanding of ceramics is that he once played in an open porcelain kiln. It is true that he went through the process from beginning to end, but it is also true that he does not know whether the technique is correct.

Anyway, the finished product is ugly.

With these as the basis, Liu Tan needs to change the focus on glazing and kiln firing.

Among them, the most important thing in glazing is enamel.

Of course, Liu Tan has never studied this, but it doesn't matter, the ancients have studied it.

He clearly remembered that Zhu Yan of the Qing Dynasty wrote in "Tao Shuo": "Glaze cannot be made without ashes. The ashes come from Leping County, 70 kilometers southeast of Jingdezhen. They are made of blue and white stones and phoenix grass, and washed with water. become."

He doesn't care where this Leping County is, the main thing is the following few sentences, blue and white stones and fern grass.

Among them, the blue and white stone is limestone, or to be more precise, it is slaked lime, and the fern is a kind of plant.

As for why this kind of plant is used, what kind of chemical reaction will this kind of plant have with slaked lime... Liu Tan doesn't know at all, and he doesn't need to know, anyway, he just wants a finished product, not for the common people. here.

The only thing I worry about now is whether the Pteris vulgaris exists now, or even if it exists, is it called by this name?Can it really be found?

He is now emotionally stable about starting to search for a needle in a haystack again.

The only thing that made him a little embarrassed was that when the people below asked what the grass looked like, he was also at a loss.

He has never seen a phoenix-tailed grass. Fortunately, the name of the phoenix-tailed grass is named after its shape. Liu Tan barely drew the shape of a phoenix-tailed, er, peacock-tail to be exact. He has never seen a phoenix-tailed grass. In my impression, the phoenix tail in many paintings is basically a deformation of the peacock's tail.

After Bi Gao picked up the piece of paper, a little doubt appeared on his face. He and Miao Rui muttered for a while, and Liu Tan raised his eyebrows and asked, "What are you two muttering about?"

Bi Gao said cautiously: "Return to Your Highness, it's nothing, it's just that we just saw this thing looks familiar."

Liu Tan was a little surprised: "Familiar? Have you seen it?"

Bi Gao didn't dare to say that he was dead, but said: "It's a bit like, when I was a child, this kind of grass grew by the well at home, and we all called it the side of the well."

Liu Tan was slightly taken aback, patted the table and said, "Yes, yes, that's it."

Ferntail grass, also known as golden cocktail, chicken foot grass, and well fence grass, is basically what everyone calls it according to what it looks like.

Bi Gao was happy to be able to help Liu Tan, but then he was a little worried: "Your Highness, there is also this kind of grass in Chang'an, but this kind of grass is afraid of the cold, so I'm afraid it's not easy to find it now."

Liu Tan felt a little worried. According to Bi Gao, this kind of grass should like shade and humidity, otherwise it wouldn't grow by the well.

In this way, part of the northern border country can be excluded, and the humidity there is not enough to support its growth.

But after Zhengdan passed, he might have to go back after the fifteenth day at the latest, and it would not be suitable for him to stay in Chang'an for several months or half a year later.

If it really doesn't work, you can only remotely control it, but it's too troublesome, let someone send the grass over?Traveling all the way just to order Pteris vulgaris?

Miao Rui who was at the side suddenly said: "Maybe there may not be none, the land dragons are flourishing in the palace, maybe they grow in some places."

Liu Tan's eyes lit up immediately, and he quickly mobilized his staff to look for Pteris.

Not to mention, I found quite a few in the end, and of course this many are for this season.

Next is the ratio of the enamel formula. At this time, Liu Tan hated the ancients who wrote books and never wrote detailed data. They didn't have any rigorous spirit in each one. They only said what to use, but you can tell how much to use!

In this way, he doesn't have to try it himself, as long as he can endorse it!

Liu Tan was so excited that he wanted to fight himself, but Miao Rui and Bi Gao stopped him desperately, and finally had to move out of Huo Guang.

When Liu Tan thought of Huo Guang's ability to talk about people, he immediately became sluggish, so he had to leave it to the people below to try.

With different proportions, the fired glaze is different.

Of course, it may not have much to do with the ratio, and partly depends on the firing temperature.

The first finished product is actually still rough, but the cyan bottle already has the shadow of later generations of celadon, and he seems to see the beautiful appearance of Ru kiln celadon through the light cyan color.

Of course, this is most likely the result of the automatic beautification of Liu Tan's eyes, but it is undeniable that compared with the original porcelain, ceramics fired at high temperatures are almost a leapfrog development.

Liu Tan flatteredly rewarded the craftsmen to continue processing and experimenting. It would be best if they could produce a set of exquisite celadon before Zhengdan, no, it was two sets, dedicated to the empress as a gift.

Although he came back this time with a lot of things, the gift from Zhengdan had to be separated from the two.

Liu Tan was originally worried that there was nothing novelty on the gift list, even if everyone gave the same things, as long as the value is there, it doesn't matter if there is nothing novel.

But he is used to come up with some new things to send up, and he is a little unaccustomed to the sudden lack of them.

It's all right now, with celadon, it can be regarded as being able to do business.

When he walked out of the porcelain kiln, he was blown by the cold wind, and his whole body was in a daze.

What was he going to do?

Oh, and make toilets.

……

It is agreed that there will be no by-products this time?