After the selection of the show girl, Zhu Cijiong can finally deal with the right thing, as for the preparation of the wedding, his mentor Xu Guangqi and the two queen mothers are in charge, so he doesn't have to worry about it at all, what he wants to do most now is a steamer, but some things must be dealt with first.

One of the most urgent is the problem of prisoners, this time the battle of the three grasslands captured a total of more than 300,000 people of the Manchu and Mongolian armies, Zhu Cijiong has ordered the three routes army to pull all the captives outside the capital, of course, not to pull them over and cut them down, he wants to use these prisoners to build a new city in the east of the capital.

According to the planning of the previous year, Dongcheng District is mainly for the merchants gathered in the capital to open shops and build workshops, the imperial court does not need to build too many things, as long as the city wall is built, the road is repaired, and then the land is divided into pieces, and the price is almost the same, as for the house, it is naturally built by the merchants who buy the land.

This time it was the Qin army that watched the prisoners build the city wall, and the cavalry of the Guan Ning army and the Tianxiong army, the Qin army and the Tianxiong army had no experience in building the city wall, but the Guan Ning army was different, they were the authentic Liaodong army, and the city wall was much more powerful than the Ding Liao army, under the auspices of Cao Wenzhao, the city wall was brushed up, only about ten days, and the main part of the city wall was completed!

Zhu Cijiong saw that they built the city wall so powerful, so they simply asked them to build a villa area of the nature of a state guesthouse outside the Dongzhi Gate near the Guozijian, that is, the Daming Academy of Liberal Arts, for the envoys of various countries and the subject countries who came to Daming to take the exam, the planning of this state guesthouse is about 10,000 acres, all built into a simple and elegant two-story small building, the middle pavilion and pavilion, the garden rockery is complete, can accommodate 20,000 or 30,000 people at the same time, and after completion, it will definitely become a place where the envoys of various countries are amazed.

After the affairs in Dongcheng District were almost dealt with, Zhu Cijiong finally had time to organize the development of the steamship, of course, this development is different from the development of later generations, his so-called development is actually to draw out the sketch and let Bi Maokang do it!

Or his private study, or a few cronies, this time the development of the steamship only involved the Ministry of Industry, so Zhu Cijiong only called Bi Maokang, Wang Zheng and Song Yingxing, these three people have been with him for more than ten years, and the relationship does not know how harmonious, Bi Maokang sat down and actually had the courage to joke: "Your Majesty, this is about to get married, I am afraid you will not have time to teach us these old courtiers in the future, tsk, three thousand beauties, some are busy!" “

Zhu Cijiong rolled his eyes, and said angrily: "Is it one hundred and twenty, the others are all palace maids, but some of the North Korean and Dongying women in it are really good, I didn't choose any of them, I kept them for you, why don't you give you one or two hundred, so that you can also be busy?" “

Bi Maokang hurriedly arched his hand and said: "Your Majesty, you still spare the micro-ministers, the micro-ministers are so old that they can't stand their toss." “

Zhu Cijiong said proudly: "Okay, I'll keep it for you first, and when you want it, you can say it directly." “

Hehe, let you follow me, I can't kill you.

How dare Bi Maokang say anything about the three thousand beauties, he hurriedly diverted the topic and said, "I don't know what the emperor has done when he recruited us this time?" “

What are you doing, of course, building a ship, but Zhu Cijiong did not give an answer immediately, but habitually guided: "Meng Hou, do you think the sailboat is faster or the train faster?" “

Bi Maokang thought for a while, and replied decently: "This, it depends on the direction of the wind and the direction of the current, if the wind and water are smooth, the sailboat may be faster than the train, and the other times the train is faster than the sailboat." “

Zhu Cijiong continued to guide: "Then what if there is no wind and no smooth water? “

When Bi Maokang heard this, he couldn't help but wonder: "Your Majesty, if there is no wind or smooth water, the sailboat can't move, how can it be faster or slower than the train?" “

Zhu Cijiong just wanted them to think about how the boat could move if there was no wind and no smooth water, and he continued to guide: "Isn't it still possible to paddle? “

Bi Maokang was even more strange, he said a little incredulously: "Your Majesty, sailboats are generally big ships, if you row an oar, how big an oar it is, and ordinary people can't row such a big oar!" “

Zhu Cijiong asked directly: "If people can't row, there is nothing to move?" “

When Bi Maokang heard this, he frowned and pondered, and soon he said excitedly: "Does the emperor mean to use a steam piston to drive the oars?" “

Zhu Cijiong slapped his face and encouraged: "Smart, that's what I mean, but it's not enough, Chang Gung, Liangfu, you also think about it, how to make the boat run as fast as a train without wind or water." “

The steamer is actually not complicated, especially the paddle wheel, you can understand it at a glance, the key is at this glance, they have never seen it!

The three of them frowned and pondered for a long time, but they didn't come up with any good way, and Zhu Cijiong couldn't help but continue to prompt: "What if you combine many oars and make a circle?" “

Song Yingxing immediately replied excitedly: "What does the emperor mean to make a waterwheel?" “

Zhu Cijiong nodded approvingly: "Yes, that's what it looks like, but it can be made a little wider, about the same width as the hull, and the propulsion force is greater!" “

Bi Maokang and the others heard this, and their eyes flashed with fiery light, and Zhu Cijiong knew as soon as he saw them like that, without him drawing sketches, these people all understood what was going on with the paddle wheel propulsion system.

However, there is not only a paddle wheel, but also a propeller propulsion type, Zhu Cijiong thought about it, and suddenly picked up a piece of paper and gently stirred it up.

The three of them were all dumbfounded when they saw the emperor like this, this is winter, although there is the latest heating system in the study, but it is not hot enough to fan the wind, the emperor is not suddenly crazy!

Zhu Cijiong didn't care at all when he saw their surprised appearance, but pretended to be mysterious and said, "I don't know why I want to fan the flames, right?" “

The three of them nodded stupidly, they really couldn't understand what the emperor wanted to do.

Zhu Cijiong reached out to the middle of the table with the hand holding the paper, stirred it lightly a few times, and then asked, "Do you see it clearly?" “

The three of them nodded stupidly, such a simple action was done in front of their eyes, how could they not see clearly, the emperor would not be really sick!

Of course, Zhu Cijiong was not sick, and he gently instigated the white paper while explaining: "Have you noticed that this paper will be deformed when it is fanning the wind? “

The three of them naturally saw it, and they nodded in unison.

Zhu Cijiong suddenly asked, "Do you know why paper is deformed?" “

At this time, the three of them stopped nodding and began to shake their heads.

At this time, Zhu Cijiong stopped fanning the wind, and directly used his other hand to gently hold the white paper into an arc with the palm of his hand, and then asked, "Is it the same as the deformed appearance when he just fanned the wind?" “

The three of them looked carefully, and it was indeed about the same arc as when they first fanned the wind, so they began to nod their heads again.

Only then did Zhu Cijiong explain: "This proves that the paper was subjected to resistance when it fanned the wind, and it was the resistance that deformed it." “

At this time, they naturally didn't understand aerodynamics, so the three of them looked at a loss.

Zhu Cijiong pointed to the fan slowly rotating behind the fireplace and said, "When you made the fan, did the fan fall backwards because the base was too light?" “

They did encounter this when they fanned, but Zhu Cijiong taught them to increase the base to make the fan stand firmly on the ground.

Zhu Cijiong continued to guide: "This proves that the fan also encountered resistance when fanning the wind, and the resistance is still very large, think about it, if the blades of the fan are made a little bigger, and then installed at the bottom of the boat, can it push the boat forward?" “

When the three of them heard this, they all suddenly realized, in fact, this is the propeller propulsion system, Zhu Cijiong just slowly guided it out in a more intuitive way, if he directly said anything about the propeller propulsion system, the three of them would definitely not understand.