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The Pegasus sloop, built by the craftsmen of Inguili, had been launched, and sailors had been recruited from the British Merchant House and Macau, but the guns on board had not been landed. (Like this book, please collect biquge.info) In view of the fact that his dividends on snow sugar and sugarcane liqueur last year had been spent, Zheng Kezhang had to be cheeky to find Chen Yonghua.

"There are only more than ten large and small red cannons that can be produced in this domain in a month, and the eldest prince needs twenty people for one mouth, how can this number be given." Chen Yonghua shook his head again and again when he heard Zheng Kezang's request. "And the eldest prince is not unaware, this domain blocked the army of the Northern Captives by the Wulong River, and the war is about to break out, and all kinds of military resources have been ordered to be transferred to Fuzhou, and artillery is naturally among them."

"Only a dozen a month?" Zheng Kezhang was immediately stunned, this output is really too high, you must know that the number in his memory shows that at the end of the Ming Dynasty, Guangdong alone could produce more than 200 cannons per month, which is a scum compared to Taiwan's artillery production system. "Why is the number of cannons so low?"

"The monthly output of the Ministry of Iron-smelting Workshop is only 100,000 catties of fine iron, and a cannon can easily produce 811 catties, even if it is all used to make cannons, how many can be made," Chen Yonghua shook his head, he really is full of people who don't know how hungry and hungry, and iron tools are used everywhere in Taiwan, and for this reason, they even have to import arrows from the hands of the Dutch, the sworn enemy, how can they all be used to make cannons. "And the cannon casting process is cumbersome, and one negligence becomes a waste cannon." If it were anyone else, Chen Yonghua naturally didn't need to say it so carefully, but Zheng Kezang's preference for miscellaneous studies was famous, so he couldn't be too perfunctory. "As a result, the natural monthly production is insufficient."

The problem of fine iron involves the problem of ore raw materials and fuel, and Zheng Kezhang can't solve it, but about the casting cannon, Zheng Kezhang has a belly of information searched from Du Niang, so he asked: "Yu has read Mr. Chuyang's "West Law Divine Machine", why don't you let Yu go to the Ministry of Industry Iron Smelting Workshop to see how it is, or how many people can increase production." ”

Chen Yonghua frowned, Zheng Kezhang had the idea of an iron-smelting workshop last time, and now there are still some thieves who are not dead, which makes him a little disappointed and worried, but Mr. Sun Yuanhua of Chuyang is a well-known firearms expert in the Ming Dynasty, if Zheng Kezang really reads the "Western Law Divine Machine" of "The First Discussion on Casting Cannons, the Second on Pharmaceuticals, and the Later on the Cause of Hit", it will be of great benefit to improving Ming Zheng's national defense level, and Chen Yonghua was also a little hesitant for a while.

However, Chen Yonghua also had a responsibility, so he made a decision after just a little silence: "The eldest prince wants to go and see it, but the servant has to make an appointment with the eldest prince in three chapters, first, the eldest prince cannot interfere in the personnel of the workshop, second, the workshop utensils cannot be changed, and third, the eldest prince can try to cast cannons by himself, but the limit is three, if it is not successful, then no more waste materials." If the eldest prince agrees to these three points, the servant will immediately issue a warrant."

In fact, the iron-smelting industry in Dongning has achieved synchronization with the development of the iron-smelting industry in the entire Ming Dynasty, not only has the operation mode of the iron-making furnace flowing directly into the iron-making furnace and the iron-making furnace in series with the iron-making furnace described in Song Yingxing's "Tiangong Kaiwu", but also has the semi-continuous operation technology of the iron-making furnace that blocks the taphole with mud after tapping and blasts the iron again. If we do not make improvements in the regenerator and exhaust gas utilization of iron-making blast furnaces, in fact, Zheng Kezhang does not have a technology more suitable for this era. However, because of Chen Yonghua's restrictions, Zheng Kezhang couldn't even make such changes.

Although he can't make any changes, Zheng Kezhang is not here to see the flowers, compared to the pig iron production that is difficult to grow explosively even after improving the technology due to the limitation of raw materials, how to cast guns faster, more economical and better is the ultimate goal of his trip.

"This is the mud fan?" On the side of the steaming iron-smelting furnace, Zheng Kezhang looked at a whole piece of clay mold that had dried and formed, and couldn't help but ask Du Dushi of the Ministry of Industry who was accompanying him with some doubts. "Just pour the molten iron in and let it agglutinate? So how do you make sure that there is no trachoma in it? ”

"The eldest prince, the iron juice used for casting the cannon is not directly used from the iron smelting furnace," the temperature of the freshly baked iron liquid is generally about 1250 °C, which may lead to the deformation of the mud fan, so it needs to be cooled in advance. "When it cools, the craftsmen will stir it to let the bubbles disperse, so that the appearance of sand hole can be reduced, of course, it is impossible to say that there is no sand hole, it is just a matter of how much, so after casting, it will be tested."

Zheng Kezhang nodded clearly, but quickly shook his head suspiciously. He nodded because he knew that it was possible to inspect some defective products in advance, but he shook his head because he was worried that in order to evade responsibility and increase production, the charge would be reduced during the test, which would seem to have a high pass rate, but it could not be used much on the battlefield.

Zheng Kezhang nodded and shook his head again to confuse Du Dushi, he didn't know what Zheng Kezhang wanted to show.

Du Du wanted to ask, but he was only a six-grade capital, how could he dare to recklessly open his mouth to the Yuanzi of this domain, so he had to pretend to turn a blind eye, and just asked lightly: "What kind of cannon does the eldest prince want to make?" ”

"Six-pound, no, two-inch long cannon (note: 1 square foot is about 0.33 meters, as a four-pounder gun), four-inch short cannon (note: equivalent to a twenty-eight-pounder gun), three-inch and a half-inch long cannon (note: equivalent to a twelve-pounder gun) each one." Zheng Kezhang used the power granted by Chen Yonghua to the limit, however, three cannons and three calibers, Nifan is equivalent to having to do three, Du Du calculated the matter, and was about to report the time it takes to make a mold, when he saw Zheng Kezhang waving his hand. "The mud fan casts the cannon, and there is too much sand in the cannon body, which is not conducive to more shots, so Yu Jiaoer waited for a new method to use the iron fan to cast the cannon."

Du Dushi looked at Zheng Kezhang dumbfounded: "Eldest prince, what is this Tiefan, how can the servant never hear of it." ”

Tie Fan, Du Du Shi naturally will not have heard of it, this is another time and space nearly 150 years after the emergence of technology, when the "known ingenuity" of Jiaxing County, Zhejiang Province Cheng Gong Zhenlin after the outbreak of the Opium War was responsible for presiding over the Ningbo area of the cannon casting, due to the tight construction period can not be used with the mud model method construction, Gong Zhenlin after meditating and thinking, sleepless night, after several tests to create a new process.

Regarding the origin of this process, Zheng Kezhang couldn't say much, but just took care of the other party to do it according to the steps he explained: first, according to the inner and outer diameters of the cannon, the mold flaps were made; In Gong Zhenlin's original plan, the first layer of slurry was made of fine rice husk ash and fine sand mud, Zheng Kezhang switched to cooked gypsum, and the second layer of slurry was made of high-quality ultra-fine pulverized coal water; Then the two petals are combined, tightened and heated with an iron hoop; and then succession, forming the shape of artillery; Finally, the molten metal is cast; After pouring enough molten liquid and cooling and forming, the iron mold is immediately peeled off according to the order of the mold flaps, such as peeling off the bamboo shoot shell, gradually exposing the gun body, and then removing the dry gypsum in the gun core, and there are naturally no large burrs in the chamber, and there are no traces of large bubbles on the outer wall.

Although Du Dushi disagreed with this, in the face of the strong Zheng Kezang, he had to do what he promised.

However, after the first six-pound cannon was cast, Du Dushi actually changed its color, and personally ran to Zheng Kezhang to sing praises: "The eldest prince, but God, this cannon, this cannon"

Du Dushi's excited words did not reach the meaning, but Zheng Kezhang knew very well that compared with the traditional clay fan mold casting gun, the process of iron fan casting cannon is simple and easy to copy, and it is not limited by the cooling and drying time of the clay fan, which can shorten the manufacturing cycle and reduce production costs, although it can not completely solve the problem of sand hole, but it can greatly reduce the sand content of the gun body, and then improve the quality of artillery casting.

Compared with the extremely excited Du in charge, Zheng Kezhang was very calm, he knew that even if the iron fan manufacturing method was adopted, the artillery of the Qing army in the Opium War still could not threaten the British warships, so he must make further improvements in artillery performance to meet the challenges in the future.

Since it is an improvement, Zheng Kezhang does not expect to reach the sky in one step, so he started from the second gun, and Zheng Kezhang began to test the inner mold irrigation and cooling method on the basis of the iron mold. In order to use the inner mold irrigation cooling method, it is necessary to make a double iron mold, so that the water used to cool the inner mold is poured in the inner layer, so as to produce the effect of stress causing the self-tightening of the body tube

"In this way, the eldest prince has come up with a great secret method this time." Listening to Du Dushi's report, Chen Yonghua sat on the chair with some surprise, of course, he couldn't recognize the beauty of the inner mold irrigation cooling method, but just one iron molded cannon method was enough to double the number of artillery produced by the Dongning Military Department every month. "You have done a good job in this matter, but this kind of technique is related to the life and death of the domain, and it must not be lightly transferred to the mainland, you understand."

Du Du left Chen Yonghua's signing room with gains and losses, thinking about it, he can get Chen Yonghua's personal interview with the soldiers and get praise, and he will naturally have a bright future in the future, but if the method of iron molded cannons spreads, then don't talk about his career and life, I am afraid that the family will also be implicated

After Du Dushi retired, Chen Yonghua also fell into deep thought. Zheng Kezang's talent in miscellaneous science made him curious and he had a lot of worries about the future of this Yuanzi, but Yang Xian's so-called admonition that miscellaneous science is more useful than morality in troubled times especially sounded in his ears, and Zheng Kezang's gaze on the military strategy also amazed him, is it good or bad for the future of Taiwan to have such a Yuanzi as the heir of Dongning?

Chen Yonghua had a hunch that just like when he refused Zhu Chenggong to arrange for him to be Zhu Jin's master, he might once again face the most difficult choice

"Yi Jiaoxi, then it's up to you to make the firing table for this cannon." Zheng Kezhang didn't know anything about Chen Yonghua and Du Dushi's troubles, and at this moment he ordered Yi Shilao, who was also a former French army artillery shooter, a deserter who once wandered the world, and a boy battalion artillery instructor.

As one of the biggest gains of Zheng Kezang's faction to pull people in Macao, Yi Shilao touched his reddened rosacea very unconsciously: "What about the tools that His Highness once promised, if there is no one, there is no way to make this shooting watch." ”

"Don't worry, you draw the style of things, like wet cannon brushes, dry cannon brushes and the like can be made, Yu arranges someone to make it for you, if you can't make it, Yu will definitely find a way to help you buy it, but before that, you have to be simple because of the ugliness, overcome it."

"What does it mean to overcome?"

"To overcome means to go up if there are conditions, and to go up if there are no conditions"

"No, no," Yi Shilao hurriedly shook his head. "Your Highness, you can't do this"

Of course, Yi Shilao finally gave in in to the silver thrown in Zheng Kezang's hand, but Zheng Kezhang had to overcome many things, such as customizing gunpowder, purifying gunpowder and changing the ratio of three bases, etc., so Zheng Kezhang actually had a lot to do

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