Compared with woodblocks, the lines of the copper plate can be much thinner and the picture is much more delicate. Moreover, after using ink, gravure printing can be performed, which is especially suitable for printing currency. Du Zhongxiao's impression is that the method of etching the copper plate is much more convenient and can express complex pictures. He even remembers that the etching of the copper plate is a solution of ferric chloride. Unfortunately, after thinking for a long time, he did not come up with a way to prepare ferric chloride.

As for using strong acids, such as sulfuric acid and nitric acid, Du Zhongxiao did not try them. These two acids can be prepared, but this era is very uneconomic and dangerous. It is better to wait until chemistry develops further before taking this path.

What is used to make plates now is mechanical methods. Using a steam engine as power, driving the carving knife to rotate through a soft shaft, carving is much simpler. After simple training, ordinary engraving craftsmen can operate it. The key is the soft shaft, which is made of steel wire, although it is far less soft than later generations, and is enough.

Every sold steam engine in the Iron Supervision Bureau is registered, and local officials will visit them regularly to prevent them from being used for illegal purposes. The soft steel wire shaft looks simple, but it is actually very difficult to make and can be controlled. Just like the printing method of the Yingtianwuya Office, it is impossible for the people to forge counterfeit banknotes. However, people's desire for money and the rich imagination of the private technical talents still make Du Zhongxiao dare not take it lightly.

Du Zhongxiao believes that the most reliable thing to imitate fake banknotes is printing. The ink used is specially made, and the picture is made by professional painters using a thorough test method to draw actual scenery. The counterfeiter can recognize it at a glance. Instead, it is a concave printing, which has a special feel when touched. These technologies are mature, Du Zhongxiao plans to launch banknotes. Start with the savings bank deposit and try the folk reaction.

The technology of movable type printing is mature, but the difficulty is the font. Without a suitable printing font, the printed books look uncomfortable and are not suitable for large-scale promotion. Du Zhongxiao tried to write some imitation Song characters by himself, so that the engraving masters could study it carefully, but it has not been completed.

After leaving the room, Du Zhongxiao shook his head helplessly. He thought a lot about metal movable type printing technology, but he didn't expect that it would get stuck on the font in the end, which was really unexpected. At the beginning, he didn't expect that this would be a problem.

Leaving the room where metal movable type and copper plates were made, Du Zhongxiao and Su Shunqin went to the place where the regular wooden plates were made. The engravers here also used a carving knife driven by a steam engine. Now the engraving is very convenient. Holding the carving knife is like writing, and the wood plates are made quickly and well. With this method, there is no urgency to print movable type and can be gradually improved.

As a power, steam engines are needed by almost all walks of life. Learning the method of making plates in the field business, the Transportation Department and the Delivery Department also bought steam engines to engrave letters, and even several important yamen in the capital have bought many.

As steam engines are used in all walks of life, the industrial revolution has shown its dawn. However, the big part of the textile industry is hemp textile. Due to the relationship between technology, the demand for steam engines is not urgent. We can only take it step by step with the promotion of cotton planting.

Time is always in a hurry, and autumn is coming unknowingly.

He Da carried a bag on his back and went outside Ruan Degong's shop. He saw Ruan Degong standing outside, bowing and saying, "The official is so leisurely."

Ruan Degong looked at He Da and smiled and said, "He Da, your family has a good business, and you will come here to save money every few months."

He Da said embarrassedly: "Minister-in-law is joking, how can I have a lot of money in my family? Because I often walk outside, the villagers have the remaining money in their hands, so I ask me to save it for them. I am just a little money myself, by the way."

Ruan Degong and He Da entered the door together. After hearing this, he said, "He Da, I want to talk about you. Money is the most touching and covetous. Don't help others with money easily. They are saving money, just do it themselves, how can they handle others' hands?"

He Dadao: "It's all fellow villagers, not outsiders, and nothing."

Ruan Degong opened the door, closed the door and entered the back of the counter, pushed open the small window under the wooden fence, and said to He Da, who was standing outside: "How much money should you save today? In whose name are they? Show me the certificate of saving money."

He Da agreed, took out five or six deposit certificates from his arms, counted the money one by one, and handed it to the counter.

The land business sold the land, and Ruan Degong's family had the best development. He opened a shop here, and his son went outside to study, and never got involved in other industries. Because of his stable business and good reputation, many businesses came to him automatically. Changping opened a savings bank for saving money, and Ruan Degong managed the town, with generous commissions every month, which added a lot of income.

Two months ago, the savings bank introduced a new policy to deposit a fixed-term deposit, with interest being collected. As soon as this policy was released, it really caused a sensation. As long as the money is deposited, there is no risk, you can get the money. This is something that has never been done before.

In the past, I had to make money with money, so I could only lend money. I had to protect the person who had to pay attention to preventing him from running away. There were many risks. I deposited it in Changping and ignored everything. I could collect interest when the time came, and everyone was moved. In just two months, the deposits in the savings bank doubled several times.

After saving the money, He Da said to Ruan Degong inside: "Prince, look at it. Is the money I have saved these days full of money?"

Ruan Degong flipped through the account book and said, "I've always had too many. Why do you have to save it for a regular period? Is it three months or half a year?"

He Dadao: "It's three months. Wait until you save another one, and you've got enough of the amount, take it out together and save it to make a whole year."

Ruan Degong said with great advice, and took a pen to correct He Da’s account and handed out the evidence. He said, "Changping Office recently issued a document. In the future, you can save money. As long as you have passed three months' time limit, you can raise cash at any prefecture and county savings station on West Jing Road. You can only take prefectures and counties, but it is not possible under the town. Remember, you don’t have to bring cash to you when you go out to do business in the future."

He Dadao: "The official is joking, I just do some small business in my hometown. How could I go to other states and counties?"

Ruan Degong said: "You don't know that there are more cars running on the railway recently, and there are more businesses in several prefectures and counties along the road. For example, places like Xiangzhou and Ye County, where there are large stations, there are all kinds of goods in the world. Just look at the eyes of everyone, you may make a lot of money when you buy some goods."

Speaking of this, Ruan Degong sighed: "I have been working hard since I opened this small shop and I can't run anymore. If it were a few years ago, I would have gone out to see what business there is. My Dalang wrote a letter back, and there are many shops in Ye County, and I don't know how prosperous it is. I wanted to learn some skills in the past two years, but now the meaning of the letter is that I don't want to go home."

He Da was a little fascinated when he heard this and said, "When did my family have money and I take my family out for a walk. In my daily life, I only heard you talk about how lively it is outside, but unfortunately I can't see it with my own eyes. I heard that a large shopping mall was opened in Fancheng, and there were all kinds of goods. Many families around me have been there, but I have never been able to get out of it. Sometimes the family and children are noisy, and they all say they want to go and see it."

Ruan Degong collected the account, came out from the inside, locked the door, and said, "It's lively and there are countless goods there. There are also ones that are not available in other places, that is, there are many famous shops inside, and the goods sold are very well-deserved, which are not visible outside. It's just that the price is too expensive, not something that we like us can afford. When we get there, it's good to buy anything and have a long experience."

He Dalian nodded repeatedly: "Yes, yes, I have heard many people say it. When I save some money, I will take my family to take a walk during the Chinese New Year this year. I will buy some utensils from the city, otherwise I will always be laughed at and have no knowledge."

He Da was doing a small business and took care of the mulberry trees in his private fields. His life became more and more prosperous. There was a job in the village, so his wife went to do it and earned some spare money. The pickled salted eggs and pineapple eggs there were very easy, and it was suitable for women to make it.

Dogtou has already gone to school and often received praise from his teacher. He Da has been thinking about it. His family is very simple and saves money. If Dogtou really has the fate and can learn some knowledge and go to a place like Iron Supervisor to work, it will be considered a success.
Chapter completed!