Yubin was also smiling, and he bowed his hand again and again, and his politeness was unusual. The other seven heads of the Jin merchants all came in person, not only to give heavy gifts, but also to bring a large amount of silver tickets, saying that they were to share the cost of expanding the army, which surprised Fan Yubin a little. In this expansion of troops, these families are all very cooperative and supportive, and they have sent many children of the clan to join the army, and Fan Yubin does not refuse to come, nor does he engage in specialization, so that they can enjoy the same treatment as ordinary soldiers. Now they have sent a large amount of military spending, which is to make their position clear to the Fan family: from now on, not only in business, but in all fields, everyone will advance and retreat together, live and die together with the Fan family.

Silver, now Fan Yubin is not lacking, and the seizure is huge when he exterminates and kills the sky. Their attitude made Fan Yubin very satisfied. Doing the math, Fan Yubin has nearly 4,500 military horses in his hands, although there are 3,3400 newly recruited recruits, which is also a large force. The key is to take full control of Zhangjiakou, which completes the most crucial step in the construction of Fan Yubin's army, leaving a huge room for maneuver for one step of army expansion.

Double happiness is coming, and Fan Yubin is also beaming. The only thing that made him a little obsessed was that the Fan family set the big day for the relocation of Star Fort on September 22. It is said that Mrs. Fan personally chose the auspicious day of the zodiac. Why this day? Fan Yubin was entangled in his heart. He knew that this celebration was going to be anticlimactic. But Fan Yubin can't say anything now, let alone say anything. He simply became the boss and did his own thing wholeheartedly.

According to Fan Yubin's request, Fan Yubin's office in Xingxingbao was arranged: a lounge, a study, a shower, and a gym. There are two conference rooms, one large and one small, and there is a secretary's room outside the study. Fan Wen and Wang Xiao, a young talent from the Datong royal family, temporarily acted as Fan Yubin's secretary, handling some daily affairs and writing business.

What made Fan Yubin feel a little depressed was that he had to go back to the Fan family compound every night to rest, because his grandmother Zhang and mother Wang were reluctant to let him go, so Fan Yubin had to go back and forth between Zhangjiakou Fort and Xinbao. Fortunately, the official road between the two forts has been repaired, and Fan Yubin is ready to spread another layer of slag, stones, and yellow sand left over from ironmaking. As for cement, Fan Yubin can't take care of it now, and I'll talk about it later.

What Fan Yubin has to do now is to arrange a few things and meet a few people.

There are nearly 2,000 workers in the iron-making workshop, including more than 600 skilled craftsmen who have come one after another, and the rest are apprentices. The first thing Fan Yubin did was to refine the iron workshop: set up a gun workshop, an equipment workshop, an accessories workshop and a local civilian product workshop. The production line of flintlock muskets and flintlock rifled guns in the gun workshop has been fixed, the speed and quality are good, and the next task is to research and improve. Now the artillery that is on the agenda. Fan Yubin is currently choosing the Franc rear-loading gun and the Tiger squat gun. The common features of these guns were their lightness, high mobility and fast rate of fire. The difference is that the Franc cannon can also fire scattered bullets, which is amazingly lethal at close range. The Tiger Squat Cannon can play the effect of a modern mortar.

As for the process of manufacturing artillery, Fan Yubin decisively rejected the clay molding cannon method that was popular at that time proposed by the craftsmen, and adopted the iron mold manufacturing process. Although the manufacture of iron molds greatly improved the speed of cannon making, it reduced the cost. However, it also has shortcomings, that is, when casting the barrel, the outer surface area is much larger than the inner surface area, resulting in the outer layer cooling first and the inner layer cooling later, especially when the inner layer is finally cooled, it is easy to crack due to greater stress. In order to solve this problem, Fan Yubin uses inner membrane water cooling technology. The inner membrane water cooling technology can ensure that the inner and outer surfaces are cooled evenly, and even the inner layer is cooled first and the outer layer is cooled later. This greatly improved the quality of the barrel. However, the technical principle is simple to say, but it is not easy to implement, for example, what is the relationship between water flow velocity and temperature change, which requires a lot of experiments, which cannot be solved by Fan Yubin's few drawings and some data, because all the objective conditions have changed. To this end, Fan Yubin set up a public relations team to try to solve the problem as soon as possible.

As for rifling, because the barrel is thick, on the contrary, it is not a difficult problem. The key is the artillery shells, especially the flowering shells, which are also the key targets of Fan Yubin's next step.

The main task of the equipment workshop at the moment is to carry out the production of armor, the study of mines and grenades. This time, in the battle of exterminating and destroying the sky, Fan Yubin's army occupied the right time, place and people, surrounded on all sides, attacked from a long distance, and was still injured by the stray arrows of the horse bandits. Thinking of the Qing army's precise archery, heavy arrows with huge lethality, and terrifying arrow arrays. After thinking about it for a long time, Fan Yubin decided to equip the soldiers with helmets, neck guards, masks and chest armor to increase protection while trying not to affect the flexibility of the soldiers.

The technology of mine production was already very mature in the Ming Dynasty, and the reason for the less powerful was because of gunpowder. At that time, gear ignition was generally adopted, which was difficult to produce and low ignition efficiency. Fan Yubin remembered the mouse trap in later generations, and the pull of the clip was huge. Try it, the effect is really good, and it's convenient. When laying mines, all you need to do is pull the clamp at the end, carefully attach the bracket, and cover it with blades of grass or soil. There are two types of mines: pull wire and trip mines. The grenade still needs Fan Yubin to think about it.

The accessories workshop is highly valued by Fan Yubin, and there are many high-level craftsmen here. It mainly uses the machine tool designed by Fan Yubin to develop and research fasteners and bearings such as screws and nuts.

The task of the civilian sector is to produce civilian products from low-grade steel for sale to the outside world in order to subsidize the huge expenses of the steel mills.

The second thing Fan Yubin did was to set up an incubation team and set up an incubation workshop. This matter is also related to the development of perfume and mosquito repellent toilet water.

The Taoist priest in charge of sulfuric acid extraction is called Gui Youguang, who is a master of alchemy. He is extremely talented, not only the extraction of sulfuric acid and hydrochloric acid is carried out very smoothly. The essence is also extracted by distillation! It is to heat all kinds of petals or some special plants in a closed container for water heat, and after heating and boiling, the flavor and vegetable oil will be stratified. The extraction of alcohol is much simpler, mainly distilled from ready-made spirits. When Fan Yubin saw this, his eyes lit up and he led some people to develop perfume and mosquito repellent toilet water. Perfume is easy with alcohol and flavor machine. The main raw materials of toilet water are alcohol, flavor, and distilled water, which is not a problem.