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The kind that Liu Yuan was playing with is called a copper penny, the most basic currency. It's mass-produced in batches, with a rough appearance, only a few simple characters and a seven-pointed star. Besides that, there are four other types of copper coins of varying value: the half-copper wheat coin worth two copper pennies, the copper wheat coin worth four copper pennies, the copper star coin worth eight copper pennies, and a copper plate worth half a copper penny. It's said that there are gold and silver coins above them, but Liu Yuan hasn't seen any in recent years. Copper coins are enough for transactions between servants and commoners. After all, the purchasing power of copper coins is quite strong; a loaf of bread weighing about a pound only costs three copper plates.

Since I'm here, I might as well stay. He didn't know how long he would be living here. To have a better future, Liu Yuan also started saving money.

The lord enjoys extremely high rights in the local area. Ordinary people need to pay more than half of their total income as taxes. As for the tax items, there are dozens of various kinds. It is said that the nobles used to have the right of the first night, but it was abolished by the king decades ago.

Over the past few years, Liu Yuan gradually realized that the Earl's territory is not limited to this island. Across the sea, there are also several villages and manors. The main industry of the Setigar family is a fleet of dozens of sea ships, which provide him with a constant stream of wealth.

In fact, Earl Adrian's reputation outside is not very good; he has the nickname 'Greedy Red Crab'. The large amount of trade makes prices on Crab Island very low, so at least the happiness index of the Setigar family's领民(territory's inhabitants) is quite high.

Buma is now worried about Liu Yuan's future. Liu Yuan is just a bastard in the castle. According to the rules, bastards have to leave the castle and find their own way after they come of age. Moreover, Buma also feels that her body is getting worse and worse. The average lifespan of people in this world is about forty years old. She is already thirty-eight years old and needs to plan Liu Yuan's future career as soon as possible.

From that day on, Buma took Liu Yuan to many places. In fact, as the lord's residence, the castle has quite a few supporting craftsmen to serve the lord. Some people have even been engaged in this work for generations, and they have their own independent workshops. For example, leatherworkers, blacksmiths, tailors, carpenters, silversmiths, coopers, beast trainers, chefs, grooms, potters, and bakers, etc.

However, because of Liu Yuan's habit of sleeping, he is not competent for many jobs. Finally, Buma approached the blacksmith Parker, who had no children. At first, the old guy was not very happy, but when he saw Liu Yuan, who was only five years old, easily lift a hammer of about ten pounds with one hand and wave it quite easily, old Parker happily agreed to Liu Yuan being his blacksmith apprentice. In this world, the inheritance of knowledge and technology is very precious.

Take blacksmiths as an example. They usually also serve as manufacturers of weapons and armor. If you want to learn these technologies, you not only have to work for the master for many years for free, but also have to pay a considerable apprenticeship fee. Even if you learn the craft, you have to take out a portion of your salary to honor the master.

For this reason, Buma took out her savings, a large bag of copper coins, worth about 1200 copper pennies. Parker accepted the money, and from then on, Liu Yuan followed him to learn blacksmithing techniques. Due to his special circumstances, he did not have to live in the blacksmith shop.

Old Parker may be old and wants to teach another apprentice. Although Liu Yuan is still young, he is still very patient in teaching him, such as how to determine the temperature of molten iron! How to choose iron materials, the materials used for forging different tools are also different. Basically, every experienced blacksmith has his own unique techniques.

The old blacksmith found that the little apprentice was very smart. He could remember many things after he only said them once, and he also mastered some technical techniques very quickly. Even some suggestions he occasionally made benefited him a lot, which made him very happy.

Liu Yuan discovered one thing, that is, the skills he had mastered before have actually recovered. For example, the blacksmith skill he once had, which had been upgraded to the master level by the system. Now, in the process of continuous learning, he clearly feels that his body is gradually matching various techniques. This made him fall into deep thought. Since blacksmith skills can be inherited, what about other skills?

With this idea, he looked around nearby, but couldn't find anything suitable. He had to pick up a small stone and throw it at the pile of firewood not far away. After just a simple adaptation, he could hit the target every time, and he could even throw it in different ways.

From this, Liu Yuan can be sure that all his skills are imprinted on his soul. As long as his physical strength can keep up, then one day he can use them as freely as before. In this way, he is much more relieved, as long as he spends this weak period in peace. He has enough confidence that no matter what kind of world he is in, he can make a career.

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In the spring of 281 of the Aegon calendar, another year has passed and Liu Yuan is almost six years old. He always feels that there is something wrong with this world. The winters for several consecutive years have not been cold. Even the coldest time is only two or three degrees below zero.

He once asked the people around him, but still didn't get a definite answer. Maybe the people he came into contact with had a narrow range of knowledge. Among them, many people had not even left the castle for a range of 30 leagues (the unit of measurement in this world, approximately one league equals 4700 meters). And Wells the scholar, the only knowledgeable person in the castle, has not come to him since Liu Yuan's physical changes were completely finalized. The original plan to study with him also fell through. Strictly speaking, Liu Yuan is still illiterate and cannot understand the writing of this world at all.

He is currently helping out in the blacksmith shop. Old Parker recently took on a big job. Sir Bendir spent a full four gold dragon coins to order a complete set of armor from him. This set of armor includes: high-quality chain mail, gorget, greaves, gauntlets, and a full-coverage helmet. This is a considerable business. One gold dragon coin is equivalent to 11760 copper pennies. And one copper penny can buy a grilled sausage and a small glass of ale at the Boar's Tusk Tavern in the port.

Old Parker's superb craftsmanship is unquestionable. The most difficult part of this set of armor is the production of the chain mail. Chain mail must be made of high-quality iron, because the wire drawing process must use wrought iron. If the carbon content in the iron is too high, or if the impurities are too high or the smelting is uneven, it is impossible to draw wire.

Liu Yuan found that the purity of the iron ore in this world is still very high, and it can meet the requirements after simple refining. The wire drawing process is to first forge the iron block into iron strips that are as thin as possible, and then use a wire drawing die to draw the wire. Liu Yuan made a small suggestion to change the wire drawing template to a multi-hole one. This allows multiple iron strips to be processed at the same time, which greatly improves work efficiency.

Each time the formed iron strip is stretched, the diameter of the iron strip will be reduced somewhat. After multiple wire drawings, it becomes thin iron wire. Because there is a cooling and hardening phenomenon, it should be annealed after several wire drawings.