By this time, the one-month short military training had long since ended, and everyone had adapted to life in the clan studies, and the clan studies were back on track and became organized.

After the most hectic period of his life, Zhang Han breathed a sigh of relief and had time to complete the trek that made him famous, that is, the trek of the second volume of "Zhang's Son and Mother Story Collection".

The scholars are well fed and dressed, and naturally some people are dissatisfied. But the people who can speak are all children studying in the clan school, and the Zhang family is spending their own money, so just muttering a few words.

However, this matter is related to millions of dollars, which is nothing in the Zhang family, but it is not a trivial matter. So, when Zhang Han went home, he was read by Zhang Wang's family for a long time, and was interrogated by Zhang Zhao, but he was coquettish and confused.

Zhang Zhao's mind is quite complicated. Ethnography conspiracy theories, he doesn't say it, but not saying it doesn't mean he doesn't want to. Between Zhang He and Zhang Han, he must be biased towards his grandson, and the old people are all relatives of the next generation. Besides, Zhang Han has great ambitions and does things in a disciplined and measured manner, which is much stronger than Zhang He, which is more in line with Zhang Zhao's wishes.

Besides, the bystanders are clear. Zhang Zhao also deliberately connived, watching from the sidelines to see how Zhang Han intended to act, in order to see clearly what his heart was. Therefore, Zhang Han refused to say, and Zhang Zhao didn't ask.

Of course, in order to make Zhang Han famous, as well as the cost of ethnography, Zhang Zhao spent thirteen or four million money in one go, and his face did not change, which fully reflected one thing - the Zhang family is rich.

In the third year of Jianning (170 years), after the Zhang family formed a caravan, the financial revenue and expenditure immediately improved, and Zhang Zhao had a very good hand.

Liquor and sugar are expensive luxuries, both in the Han Kingdom and outside the Saiwai Kingdom. In particular, the strong liquor has caused a sensation in the border market, making the Wuhuan and Xiongnu people of all ethnic groups living in the bitter cold land of the north obsessed. In the border markets of the two states, the liquor with a degree of about fifty or sixty can be exchanged for a horse for one or two catties, and a horse can be sold for hundreds of thousands of dollars in the mainland. The magnitude of the profits can be seen.

The national capital Luoyang, Nanyang Wanxian, Qi Linzi and Yingchuan Yangzhai are all prosperous metropolises with a long history, in addition to Luoyang, it is not far from Lu State. In the first half of last year, the Zhang family opened a restaurant in each of the four places in the name of others, with stir-fried vegetables and fine wine as signs, and the restaurant quickly became famous for its fine food and wine, becoming one of the most famous high-end restaurants in the region.

Soybean oil is used for stir-frying, and Zhang Han designed a press that uses water power to press soybean oil, and then passes through multiple layers of filtration to ensure that there is no dross at all. For the sake of secrecy, soybean oil is not called "soybean oil", but "melon oil" - it is known as oil melon, and a melon is cut open and is melon oil. The seasoning is also ground into powder in Zhangjia, mixed according to a certain proportion, and then sent to the restaurant for use.

The Zhang family has to send someone to give gifts to Zhang Rang and others every year, and when the Luoyang Restaurant opened, the Zhang family simply gave Zhang Rang three layers of dry shares. This is just a name, Zhang Rang doesn't care much, whether there is or not, the Zhang family will not give him less gifts every year. However, the Zhang family has a steady stream of gifts, and Zhang Rang also smiled.

The Zhang family runs caravans and restaurants, and they need Zhang Rang's signboard very much, in case bribery does not work, or when the officials are too greedy, they can also make a small threat to lure them.

Zhang Zhao wanted to open a few more in Chang'an, Handan, Yanji, Chengdu, Shouchun, Panyu and other metropolises. It's a pity that the Zhang family lacks suitable manpower, and they have more than enough strength but not enough strength, so they have to put it down for the time being.

There is also porcelain and Zhang's paper.

Porcelain only began to be developed last year, the production time is relatively short, and the mass production capacity has not yet been formed, and the Zhangjia caravan has not formed a sales network, which is still in planning for the time being. The point is that porcelain is very lucrative and eye-catching, and Zhang Zhaozheng is hesitant to give a piece of the pie to a few businessmen who have always been in contact. When the time comes, you can use both its sales network and its connections.

According to the Book of Heaven, the Zhang family found suitable porcelain clay in the northeast of Boshan and the northwest of Zishui, and bought a large piece of land at a high price in the local area. However, Zhang Zhao always felt that he was not safe, and he was active, and he wanted to buy a Qi minister for Ding Wei. Although the current emperor has not openly sold his official position, he has a relationship with Zhang Rang, as long as he is willing to spend money, it is not difficult to buy a state minister. Ding Ji has been an official for many years, and there is no problem with his qualifications, and things are easier.

With the publication of "Zhang's Son Entertainment Mother Story Collection", Zhang's paper also became famous in one fell swoop. However, at this time, the paper mill also mainly produced grinding paper for family use, and only provided a small amount of Zhang's paper to foreign caravans for trial marketing. There is a paper mill at home, and it is an elegant thing to be able to produce good paper. But it would be a bit too much to hand over Zhang's paper to his own caravan to sell. Zhang Zhao thought about it, and felt that it was not worth it for this little money, so he sold it to the caravans.

These two things have not yet made much money, but the prospects of the two are limitless, lucrative, and well-known.

Moreover, Bian Dongzhuang's iron output has also increased significantly in the past two years, which can basically meet the needs of the Zhang family. The salt production of Haiquzhuang is also growing rapidly, and it is expected to meet the Zhang family's own use by the end of this year.

After going to these two major expenditures and the above-mentioned inputs, Zhang Zhao not only saved enough expenses for reclamation, but also made a lot of money. With money in hand, Zhang Zhao is naturally much more generous.

What's more, in the Book of Heaven in the first year of Xiping (172), the method of making mirrors was also recorded.

Zhang Han knew about the silver mirror reaction, but when he did the experiment, he used the medicine prepared in the laboratory, and he didn't know how the silver nitrate solution was made from scratch. Therefore, the mirror recorded in the Book of Heaven is a tin-mercury mirror.

On a piece of flat glass, melted tin is poured and then a thin drum is used to grind the tin into a thin, uniform tin layer. After the tin has cooled, pour the mercury onto the tin foil mirror. After a month's reaction, a tin-mercury mirror was ready.

Speaking of which, mirrors are not a rare thing in the Great Han Kingdom. The copper mirror manufacturing industry in the Han Kingdom is very developed, and large copper mirrors such as gilding, gold-filled, lacquer-backed and painted figures are very common and of good quality.

"Huainanzi" recorded: "The beginning and bottom of the mirror are hazy and undescribed. and its powder is made of Xuantin, Mo is white, and the sideburns are slight, which can be observed. ”

The eyebrows can be seen clearly, and the brightness and clarity of this mirror can be imagined. Zhang Wang has several bronze mirrors, one of which is this kind of copper mirror. Zhang Han once saw that it was very smooth and white, and it was used for a long time, without grinding the mirror, and it was still as clean as new, not much worse than a glass mirror.

The mirror was given to Zhang Wang by Zhang He, and his grandmother Zhang Liu coveted the mirror. In private, she talked to Zhang Hannian several times. What is not filial piety, marrying a daughter-in-law and forgetting his mother, which made Zhang Han laugh secretly. It seems that the relationship between Chinese and foreign mothers-in-law and daughters-in-law in ancient and modern times is almost the same.

Zhang Wang's family also has an even more magical bronze mirror, but it is the dowry she brought from her mother's family. The bronze mirror looked ordinary, just like an ordinary bronze mirror. However, under the illumination of the sun, the inscriptions and patterns cast on the back of the copper mirror will be clearly reflected on the wall in the light and shadow reflected by the copper mirror. Zhang Han didn't know the reason, but fiddling with the translucent mirror, the words "Seeing the Light of the Sun" would be reflected on the wall, which surprised him for a while.

Of course, whether it is the bronze mirror or the translucent mirror, it is rare and valuable, and it can be described as a treasure. Moreover, in terms of bright imaging, it is inferior to tin-mercury mirrors.

Three months later, the glazed kiln successfully made the first tin-mercury mirror. Zhang Zhao knew that he had another way to make money. Scarcity is expensive, and a lot of things are not worth much. Over the years, I have seen a lot of good things recorded in the Book of Heaven, and Zhang Zhao has seen a lot of them, and he is not insensitive to them.

However, this year's five volumes of the Book of Heaven are still a little different.

Zhang Han doesn't remember much about physics and chemistry, and he has no intention of studying it in depth, but these things are of great significance and require continuous investment in manpower and material resources, so he put physics and chemistry into the book of heaven. Among them, there are two volumes of physics and one volume of chemistry. Of course, the Book of Heaven is not the same as the textbook written by Zhang Han later. Roughly speaking, when writing the Book of Heaven, Zhang Han was in a hurry, it was just a summary, it was more messy, and there were even mistakes. When Zhang Han officially compiled the textbook, he found a lot of omissions and corrected them one by one.

In addition, there is a volume devoted to mapping, and only one volume is devoted to standardization, the compass, and mirrors.

In this year's book of heaven, Zhang Zhao can't understand much. Fortunately, Zhang Han is very talented in this, and he knows it at a glance, and he understands it as soon as he knows it. After Zhang Han explained for a few days, Zhang Zhao asked Zhang Han to study the four volumes.

Therefore, Zhang Han took the Book of Heaven as the 'original' and officially 'began' to compile Gewu and chemistry textbooks.

[Be kind, read a book and smash the ticket]