Holding the apple that Zhang San found in his hand, looking at his father's puzzled eyes, fortunately he also smiled and demonstrated, took it in his hand and threw it away.

"Dad, look at it, this apple in my hand, I throw it into the sky, it will always fall, no matter how I throw it, how hard I throw it, it will fall and fall back to the ground, do you know why?"

Suddenly, I heard Wan Xing say this, and it is true that no matter how he threw the apple, the apple would always fall back to the ground, or even hit his head, which was originally a normal natural phenomenon, but he had not paid much attention to it before, and now it was suddenly mentioned by his son, Wan Chengdao was also stunned, touching his chin and thinking thoughtfully.

"yes, why is that?"

Seeing that his father was really inspired, he began to fall into deep thought, fortunately, he was kind and seductive.

"Daddy, it's not just apples, it's a phenomenon that can be seen everywhere in our lives, and things we throw out always fall down, as if there's an invisible force luring it back to the ground, right?"

Nodding slowly, thoughtfully, although he likes to die, Wan Chengdao is also a person who is keen on all kinds of inventions and creations, and his ability to comprehend new things is much stronger than that of ordinary people, so his eyes are slightly bright.

"Yes, that's true, son, isn't this what you call the law of gravitation?"

"That's right, Dad, this is the law of gravitation, it is everywhere and all the time, and it is precisely because of the existence of gravity that we are restricted from flying."

"So the most critical step for you to fly is to find a way to break through this force, and only after you successfully break through this force, can you really fly to the sky and swim freely in the sky, do you understand?"

nodded, and gradually excited, Wan Chengdao also said excitedly.

"No wonder, I see, I see, haha, I understand, son, I finally understand why we have been unable to fly, it turns out that this is the case, it turns out that it is because of the existence of gravity, hahahaha, I finally understand."

Seeing Wan Chengdao's suddenly ecstatic look, he smiled, fortunately comforting.

"Don't be impatient, Dad, listen to me first, you tried to use rockets to power to break through this force, the idea is right, and even very genius."

"It's just that with our current technical level, the use of rockets is too low-level, and it can't be used as a stable flying power, it can't fly high, and it can't fly for long, and in the end it is very likely that it will either explode and die, or suddenly fall down and die."

Wanchengdao, who suddenly opened up, was also in a hurry.

"Yes, yes, son, what you said is right, when I used a rocket to fly in the sky before, my father discovered this problem, because I have experimented, the thrust provided by each rocket is different, some are strong and some are weak, intermittently, and the thrust of the rocket will soon be exhausted, and it will not be able to fly for a long time."

"And according to what you said, this gravitational pull is everywhere and all the time, so we have to find a way to find another stable source of power, but what else can we use? Isn't it an improvement of the rocket? Make its thrust stronger and longer-lasting? ”

Wan Chengdao subconsciously began to ponder.

And seeing his serious look, fortunately he smiled helplessly again, thinking that his cheap dad was really enchanted, it seems that he really wants to fly and be an astronaut.

It's just that in this era, it's really too difficult to fly, even if you understand all the principles, it's hard to do it.

At least it is impossible to use rockets as power, after all, limited by technology, no matter how it is improved, it is impossible to use it as a stable source of power.

However, it may be possible to try to get him to take another path and explore another epoch-making source of motivation.

Therefore, after thinking about it, when I saw my father's eager eyes, I saw that Wan Xing suddenly laughed treacherously, and continued to follow the good path.

"Hey, a stable source of power? Got it, Dad, do you know the eggshell steamboat? ”

"Eggshell steamship, what's that?"

Wan Chengdao asked with a confused expression.

"A very interesting little thing, you wait, I'll make it for you."

As he spoke, he saw that he was in a hurry to search at home, and soon found the materials he needed.

An egg, a very light paulownia plank, a small candle, a thin wire, and a small awl.

After preparing these materials, he took Wan Chengdao to a large water tank in the courtyard and prepared to make them.

This is indeed a very simple little experiment, which belongs to the level of manual work in the elementary school stage of the previous life, which is to let the children experience the charm of steam, which is basically a small experiment that everyone knows.

However, I believe that for people in this era, it is still amazing.

So Wan Xing plans to use this to open the door to another new world for his father.

Sure enough, seeing the mess of things that Wan Xing took out, which were eggs, candles and wires, Wan Chengdao was stunned again, and he didn't know what these things were for, so he looked at him with a puzzled face.

"Son, what is this? Does it have anything to do with the stable power source you said? ”

Facing Wan Chengdao's doubtful eyes, fortunately it was a confident Dao.

"Dad, of course it has a relationship, and it has a lot to do with it, let me ask you, in this day and age, if we want to make a ship move, is there any other way besides manpower and wind power?"

"Something else? What else can be done? Son, there shouldn't be any, don't lie to me! ”

Wan Chengdao is even more puzzled, because as Wan Xing said, in this era, if you want to make a ship move, in addition to manpower, wind power, is there any other way?

There shouldn't be any, anyway, Wan Chengdao has never seen it.

I saw that I was fortunate to be confident.

"Yes, Dad, today I'm going to show you the third force that can make a boat move, steam power."

"Steam power?"

"That's right, it's steam power!"

Saying that, fortunately I didn't explain too much, and I just made it by hand.

First of all, he took the egg in his hand, carefully made a small hole in the tail with an awl, and then poured out the egg white and yolk inside little by little, leaving only the empty egg shell for later use without damaging the eggshell.

Immediately after that, the thin iron wire is bent into a triangular bracket, fixed on the paulownia board, and then the hollowed out eggshell is poured into one-third of the water, placed on the tripod bent by the thin iron wire, and a small candle is placed under the eggshell containing the water, so that a simple eggshell steamship is basically completed, just waiting for the ignition to set sail.

And looking at Wan Xing's less than a cup of tea to make such an eggshell steamboat, Wan Chengdao was even more dumbfounded, curiously holding it in his hand and looking left and right, I don't understand how such a ship moves?

Without even sails and oars, is there really a power to sail? What exactly is steam power?

Therefore, he looked at him with a puzzled face and said, "Son, is this the eggshell steamship you are talking about?" It's that it can sail without manpower and wind, but with what kind of steam-powered sailing you are talking about? It's really fake, how can the father not believe it. ”

"Hehe, Dad, it's useless to talk too much, if you don't believe it, then you can see it, because the next moment is to witness the miracle!"

Saying that, not talking nonsense, I saw that fortunately I directly lit the candle under the eggshell, and then put the eggshell steamship into the water tank, and thought expectantly, this is the first handmade invention that the master has crossed into this world, but don't let me down!

Sure enough, under the nervous gaze of Wan Xing and Wan Chengdao at the same time, the atmosphere did not dare to breathe, and after a while, the water in the eggshell boiled, and then, a magical scene happened.

Because the steam formed by the boiling water inside the eggshell has nowhere to evaporate, it can only be ejected through the only small hole in the back of the eggshell, resulting in a continuous and stable steam power, which is also very strong.

The boat was pushed forward little by little in the water tank, neither relying on wind nor manpower, but really as Wan Xing said, steam power!

Seeing this, Wan Chengdao was also shocked, and muttered incredulously.

"It's moving, it's really moving? Incredible, how is it possible! How does this work? ”

As he spoke, he did not believe in evil, and put his hand on the small hole behind the eggshell and tried it, even if the heat was unbearable, he felt that there was indeed a continuous hot air spurting out of the small hole, and he was shocked and delighted in the face of pushing the boat forward.

"Sure enough, son, it's incredible, there's a hot gas spewing out of this small hole, pushing this little boat forward, isn't this what you call steam power?"

"That's right." nodded, saw Wan Chengdao's surprised eyes, and said with a smile.

"Dad, this is what I call steam power, you don't have to be shocked, because this kind of power is actually very common, just like when we usually boil water, the water will keep opening the lid after boiling, the principle is this power, but we haven't paid much attention to and used it before."

"And if we can really use this power, then at the moment, it is more reliable than your rocket power, because we can't completely control the power of the rocket in a short time, but this power is completely possible!"

"Once it is actually put into use, it will provide us with a stable and continuous source of power that will be more effective and reliable than wind and manpower."

"So, Dad, if you can study it thoroughly, build a steam engine, or build a ship that is entirely powered by this power, then your dream of flying may be within reach!"

Fortunately, it was a good trick.

And for a while, under the ecstasy, Wan Chengdao also nodded heavily, he couldn't speak, he picked up the eggshell steamship as a treasure, held it in his hand, and studied it carefully.

I didn't think about flying or anything anymore, but instead began to study this magical steam power, thinking about whether we could amplify the steam power in this small eggshell, so that it could really become a power source that could propel a huge ship.

After all, for him, although flying is a dream, it is too ethereal and a little difficult to realize, but this magical eggshell steamship in front of him is real, and the new steam power is also real, and studying this seems to be more interesting than studying how to fly!

And Wan Xing is also looking forward to it, because he also wants to know if he can make his cheap dad become the new father of steam with his inspirational guidance, and truly push the Ming Dynasty, which has been vaguely moving towards the germination of capitalism, into the era of the industrial revolution.

But then again, I am now in the year of Daming, why don't I have any impression in my mind at all? No, you have to hurry up and find out, otherwise, maybe Huang Taiji won't know if he enters the customs.

Thinking about it, I saw that Wan Xing no longer paid attention to his father, who was already obsessed with holding an eggshell steamboat, and ran back to the room by himself, ready to make up for the historical information of this period!

……

……

……

(Ask for recommendations, collections, follow-ups, comments, investments, in short, all kinds of requests, new books, please support the author more, thank you sincerely!! ）