In just half an hour, the generals who came with the army had already gathered in Pei Min's tent.

In the period of cold weapons, the overall tactical structure of the East was superior to that of the West.

Before the army set out, the Tang Dynasty would prepare a strong backup army for it, including not only the baggage team, but also the medical team, the craftsman battalion and all other wartime needs.

In history, the defeat of the battle of Gao Xianzhi and Talas caused many intellectuals and skilled craftsmen to capture the Arabs, resulting in the spread of many secrets of the Tang Dynasty to the west. Legend has it that papermaking was passed down in this era, and from then on, Europeans began to popularize education, laying the strongest foundation for the Renaissance.

Whether it is true or not, there is no objection to pursuing it now.

But the Tang Dynasty's troops dispatched this time are far greater than history, and the weight of logistics is naturally the same.

The artisan battalion alone numbered as many as 1,000 people, all of whom were members of the general prison and were responsible for the maintenance and repair of bows and crossbows, armor, and at critical times, the manufacture of siege equipment such as catapults.

Shinong Industry and Commerce!

Many of the craftsmen's excellent skills are regarded as strange and ingenious skills, and the status of the craftsmen is not high, and in the face of Pei Min, a figure above 10,000 people under one person in the Tang Dynasty, they all seem very restrained.

Only Song Qingli, who will be a master craftsman, has a certain status and becomes this up-and-coming bird: "Pei Shuai!" ”

"Wait a minute!" Pei Min was still drawing drawings, and he didn't raise his head, so he answered.

At this moment, Pei Min is very fortunate in his heart, he has a fun friend in the future life, under his instigation, the two went to the park together, took a hot air balloon, saw the structure of the hot air balloon with their own eyes, and listened to the person in charge of the sky to introduce the principle of hot air balloon power, which drew drawings, quite handy.

"You all see, this is a refractory leather cloth, and it has to be made big, and there can't be a little air gap...... This rope must be strong, not only to bear the weight, but also to withstand the shaking, as for this hanging basket, it is best to weave with vines, the space should be large, at present it is mainly manned, and it is also necessary to store enough fuel. What is fuel, I'll talk about it later. Finally, I put these things together and made this shape......"

He gave the storyboard first, and then put it all together.

All the craftsmen, including Ordas, gathered nearby.

Looking at the real thing of Pei Min's last words, a middle-aged man couldn't help but say, "This is Kong Ming lantern?" ”

Pei Min glanced at him, he was a very simple middle-aged man, with a public face, and there was nothing special about his appearance, so he said: "Good eyesight, this is the product derived from Kong Ming lanterns." Kong Ming lanterns can fly into the sky, and this hot air balloon can do the same. ”

Hearing Pei Min want to send the objects in the painting to the sky like Kong Ming lanterns, they were all speechless in horror.

Pei Min's bold and reckless idea is really a bit incredible.

If it weren't for Pei Min who came up with this idea, half of the craftsmen in the tent would have stood up to refute it.

This knowledge is beyond their comprehension.

Even if it was Pei Min, everyone didn't say anything, and their expressions were a little disapproving.

The middle-aged man who spoke said unexpectedly: "Truth, I think it is feasible, but all this is an illusion. Kong Ming lanterns can be lifted into the air because the paper cloth is as light as nothing, and with the power of candles, it can be driven. But as long as a little weight is added, the Kong Ming lantern will not be able to rise into the air. ”

Pei Min looked at the middle-aged man in surprise and said, "Have you done a similar experiment?" That is, to try ......"

The middle-aged man nodded and said, "Out of curiosity, I tried it a long time ago." Later, I gave up, most normal people are around one hundred and twenty pounds, and it takes a lot of strength to send people into the air. You can't do it with candles alone, and as for the carbon fire, its weight is stronger than its strength and it can't fly. It is possible to try the oil, but the oil burns too quickly and has no effect. ”

“……”

Pei Min was shocked again, maybe the middle-aged man failed, but it is because there are thousands of people like him who dare to experiment and innovate that the times will progress.

In addition to this awe, Pei Min also asked his name.

The middle-aged man replied respectfully, "In Xia Jinan." ”

Pei Min suddenly felt a little familiar, and said with a smile: "I seem to have heard of ...... somewhere" He thought for a while, and suddenly slapped his thigh and said: "Cylinder car, the craftsman who improved the cylinder car, it seems that he is also called Ji Nan, could it be Your Excellency?" ”

His tone and words changed.

Since ancient times, China has been a country based on agriculture, and has made remarkable achievements in agriculture-related science and technology. Water conservancy is the most indispensable part of agriculture, and although successive dynasties have devoted themselves to the construction of water conservancy projects, whether it is irrigation canals or canals, a large number of manpower, material and financial resources have been mobilized to build them.

Most of these channels are located in major agricultural areas, but they are still inaccessible to highlands or places far from irrigation channels and water sources.

Therefore, the Chinese working people used their wisdom to invent a kind of agricultural tool waterwheel that can divert water for irrigation, and use the water of the river canal to introduce the water into the field.

Waterwheels appeared as early as the Spring and Autumn Period, but they were only rudimentary tools, relatively rough and impractical. Until the end of the Han Dynasty, Ma Jun invented a keel waterwheel that diverted water from the low to the highland, pushing the waterwheel to various places and benefiting all people.

However, the keel waterwheel also has its own shortcomings, insufficient power, small water intake, complex structure, and requires manpower and ox power to rotate.

In the Sui and Tang dynasties, the keel waterwheel has been gradually eliminated and replaced by a tube car, but the tube car itself has shortcomings.

Ten years ago, a craftsman named Ji Nan in Jiangnan improved the cylinder car, using the principle of hydraulic operation, so that the bamboo tube can take water independently, and the water will be irrigated into the field by self-transduction, officially bidding farewell to manpower and fully automated operation.

This brand-new cylinder car benefits all the people in the world, and after Pei Min took office, he heard similar things and remembered this name vividly.

Ji Nan bowed his head and said: "No, it's down." ”

Pei Min was in awe, and he also cried out for Ji Nan in his heart, and sighed secretly: "It's sad! ”

Ji Nan's cylinder car benefits all the people in the world, but he himself is unknown, and he is only a small general as a prisoner, and then think about Li Longji's pear orchard, who are famous and wealthy in Chang'an.

He bowed deeply to Ji Nan and said, "Master Ji benefits the people of the world, and he will be worshipped!" ”

Pei Min didn't give Ji Nan time to be moved, and preached: "The real reason why Kong Ming Lantern can rise into the sky is because of thermal expansion and cold contraction. When the air expands when heated, the specific gravity becomes lighter and rises upward. As long as there is enough heat, this hot air balloon can definitely carry people into the sky. Before, because there was no such condition, now we have Greek fire in the West, and with the power of Greek fire, it should be able to achieve the miracle of manned lift-off. I will use a hot air balloon through the 200,000 troops of Arabia to rescue the envoys of the Feng Changqing and the kings trapped in the city. ”

"Master Song, you are responsible for the preparation and production of materials, Master Ji, you follow this monk Ordas from the West to understand the use and improvement of Greek fire, whether you can let it rise into the air or not, it depends on you!"

Since he discovered a genius like Ji Nan, Pei Min did not hesitate to reuse it.

There is no shortage of talents in this world, what is lacking is the people who find talents.

Maxima often has, Bole does not often have, that's what it says.