When he came back this time, the dragon king stayed for a long time.

From spring ploughing until April, almost May.

In almost three months, the entire Nanhai County has changed a lot.

After Sima Zheng inspected the whole county, he began to take office, and he sat in Fanxian County and led the overall situation.

As for Xu Shao, he can't be idle, just like the Dragon King, wandering around the county, but he hasn't commented on someone or something recently, in fact, Xu Shao really wants to comment on the Dragon King's spells, but unfortunately he doesn't know about this aspect, so he simply fell silent.

Dawei Dragon King Coins have been circulated in various counties and have become the mainstream currency of Nanhai County, as for the Wuzhu Coin, it will only be used when outsiders come to Nanhai County, and they are generally exchanged for Dragon King Coins in Yamen.

The main roads between the counties were repaired one after another, and the Dragon King originally wanted to popularize jet cars in the counties, but his faith points could not keep up at all, so he could only postpone the time.

The economic plants that the dragon king cares about are growing very well, and this year is expected to harvest oranges and lychees, if this harvest is made, it will be at least several million catties, and the entire Nanhai County will definitely not be able to digest it, the dragon king talked to Zhen Xun about this matter, Zhen Xun said that the Zhen family is actively preparing and will do their best to sell these fruits outside.

The number of students from other places in Zhongsu County has finally decreased, many students have published books, and the dragon king has also read them, but there are not many books that can be used for teaching.

Mo Liang and Ma Jun had a good chemical response, and they successfully built the biogas room, because the main material of biogas is all kinds of manure, so the occupation that should have appeared in the Tang Dynasty: pouring night incense, has appeared in Qingping and Mingfeng counties.

The dragon king went to the beach once, checked the condition of the pipe vines, the growth of the pipe vines is very terrifying, now, the length of the passage that has been opened is more than 800 meters, this passage has been obliquely down, I don't know how deep it is in the sea, because it is too dark outside, you can't see anything at all.

The pipe vine that has grown to such a huge size has a large internal space, and it can even be used to repair the house inside, so it can be said that except for the slight flaws, the pipe vine is quite successful.

Later, when you have a water-sheltering bead, you can open an exit somewhere in the pipe vines, and then slowly expand it, starting from scratch, maybe you can really build an undersea city soon.

According to Yu Ji, Hua Tuo often practices medicine everywhere, and Yu Ji has sent someone to inform him, but he doesn't know if Hua Tuo has received the news, and there are many accidents in these years.

At the end of April, the Dragon King made a trip back to Qingping, because Quan Gang had sent someone to inform him that Ma Jun and Mo Liang had invented a jet rollover.

When he heard this new type of overturning, the dragon king already had a little premonition, but when he really saw it, the dragon king couldn't praise it, and praised these two people for being too talented.

The jet dumper is erected on the bank of a river in the Qingyuan River, about six meters high, is a behemoth, the whole body is all wooden, as far as the eye can see, you can see that there are nearly 100 large or small gears around the overturn, the big one is like a round table, but the small one is only a few centimeters.

These gears were put together in a way that the dragon king did not understand, but it was very ingenious, and Ma Jun and Meng Liang also made extensive use of rubber, and the blade shaft was connected together with rubber and gears.

Next to the overturned car, there are several cauldrons like barrels, and the gas outlets of the cauldron are all together.

The operation mode of this jet dump is as follows: boil water with charcoal, let the water in the pot boil, form steam, the steam of several cauldrons accumulates together, sprays on the blades outside, the blades rotate, and then drives the gears, and then with the help of the power of the gear rotation, drives the water suction plate of the overturned car, and draws the water up from the Qingyuan River.

When Ma Jun and Mo Liang demonstrated to the Dragon King, the ink workers desperately turned the blower to make the charcoal under the pot burn to the fullest, and under the action of various forces, the water of the Qingyuan River was pumped up, like a white horse roaring into the canal on the side.

This jet dumper can draw a lot of water, and in an hour, it can irrigate hundreds of acres of fields.

"How did you come up with that? Thinking of harnessing the power of steam. The Dragon King asked after a long pause, and he was surprised.

"It was Ma Jun who thought of it, when Ma Jun was cooking that day, he saw the steam in the pot, and he thought it was similar to the jet tricycle, and then he said to the little one, the two of us want to try it, and the dragon king Hongfu really made the small one." Mo Liang said with joy.

Ma Jun nodded, and then said: "Dragon King, this charcoal doesn't seem to be powerful enough, the little one knows that there is a kind of charcoal, the temperature can be higher than charcoal, if you use charcoal, this overturn should be able to improve." ”

Coal refers to coal, and there were already places using coal in the late Eastern Han Dynasty, and it was not uncommon for Ma Jun to know about it.

After a pause, the Dragon King said, "In the Heavenly Realm, there is a kind of machinery called the Steam Engine. ”

Steam engine? Mo Liang then asked, "Dragon King, is what we are doing now is a steam engine?" ”

"Well, almost." The dragon king pointed to the cauldrons: "The principle of the steam engine is like this, in a sealed environment like a pot, it is burned at a high temperature to form steam, the higher the temperature, the greater the force of the steam ejection, and the idea of the jet tricycle also comes from the steam engine." ”

"So that's the case, the words of the dragon king, let the villain suddenly open, no wonder, the villain always feels that the power of steam is not enough, so he has to use several pots, it turns out that it needs to be sealed, just like a biogas digester."

"If it is sealed, then it is estimated that two pots will be enough." Ma Jun also said.

"But in that case, the requirements for the pot will be high, otherwise it may explode."

"Well, I'll ask Blacksmith Wang in a moment to see if he can make that pot."

"It's a pity that there is no charcoal, otherwise there would be no charcoal."

"Is it okay to use biogas?"

"I'm afraid not, the temperature of the biogas is not high."

Listening to the conversation between the two of them, even he forgot that the dragon king's mood was complicated and joyful, although it was because of the inspiration triggered by the jet tricycle, but in any case, the two people were physically active, and they were able to convert inspiration into real things, which was also quite remarkable.

Looking at the huge jet overturned car again, the Dragon King said slowly: "Ma Jun, Mo Liang, you two are very good, I hope you can continue, continue to use your brains, and work hard to perfect this steam engine, this thing has a huge effect." ”

"Don't worry, the little one will definitely work hard." Ma Jun and Mo Liang said in unison.

After leaving, the Dragon King has always sighed that if these two people really built a steam engine, then I am afraid that he will soon usher in the steam age, and once he enters the steam age, the speed of scientific and technological progress will be very fast.

"These two are talents."