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

During the period of cold weapons, the overall tactical institutions of the East were better than those of the West.

Before the army set out, the Tang Dynasty would prepare a powerful reinforcement army for it. The reinforcements not only include baggage teams, but also medical teams, craftsman battalions and other wartime needs.

In history, many intellectuals and skilled craftsmen captured Arabs alive, resulting in many secrets of the Tang Dynasty. According to legend, papermaking was passed down from this era. From then on, Europeans began to popularize education, laying the strongest foundation for the Renaissance.

Whether it is true or false, there is no objection to the investigation now.

But the troops dispatched by the Tang Dynasty this time are far greater than history, so the logistics is of course the same.

There are as many as a thousand people in the craftsman camp, all of whom will be members of the prison, specializing in maintaining and repairing crossbows and armor equipment, and at critical moments, they will manufacture catapults and other siege equipment.

Scholars, farmers, industry and commerce!

Many of the excellent skills of craftsmen are regarded as strange and erotic skills. The status of craftsmen is not high. Facing Pei Min, a figure who is less than one person in the Tang Dynasty, all of them seem very restrained.

Only the master craftsman Song Qingli has a certain status and becomes the first to be the first: "Shuai Pei!"

"Wait a moment!" Pei Min still drew the drawings without raising his head, responding.

At this moment, Pei Min was extremely grateful that he had a fun friend in his later generations. At his instigation, the two went to the park to play together, took a superheated air balloon, and saw the structure of the hot air balloon with their own eyes. He also heard the person in charge of the heavenly introduction to the principle and motivation of the superheated air balloon. This was quite handy when drawing the drawings.

"Look at it, this is a fire-resistant leather cloth. It needs to be made large, and there should not be a little air gap... This rope must be firm, not only to bear the weight, but also to withstand shaking. As for this hanging basket, it is best to weave it with vines. The space should be large. At present, it is mainly for carrying people and it also needs to store enough fuel. What is fuel, I will say later. Finally, combine these things and make this look..."

He gave the storyboard first and then combined all the stories.

All the craftsmen, including Aldas, gathered nearby.

Looking at the real thing Pei Min said last, a middle-aged man couldn't help but say, "Is this Kongming lantern?"

Pei Min looked at him and was a very simple middle-aged man with a public face and no special appearance. He nodded and said, "Good eyesight, this is the product derived from the Kongming lantern. The Kongming lantern can fly into the sky, and this hot air balloon can do it."

When Pei Min tried to send the things in the painting to the sky like a Kongming lantern, they were all so shocked that they couldn't speak.

Pei Min's bold and arbitrary idea is really incredible.

If it weren't for Pei Min's idea, half of the craftsmen in the tent would stand up and refute.

This knowledge is beyond their understanding.

Even Pei Min, everyone didn't say anything, and their expressions were a little dissatisfied.

The middle-aged man who was talking said unexpectedly: "The truth, I think it is feasible, but all this is an illusion. The Kongming lantern can be launched because the paper cloth is as light as nothing, and can be driven by the power of candlelight. But as long as you add a little weight, the Kongming lantern will not be able to take off."

Pei Min looked at the middle-aged man in surprise and said, "Have you done a similar experiment? That is, 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 120 kilograms. It takes a lot of strength to send people into the air. Candlelight alone cannot be done. As for carbon fire, its weight is stronger than power, and it cannot fly. However, oil can be tried, but the oil burns too fast and has no effect."

“…”

Pei Min was shocked again. Perhaps the middle-aged man had failed, but it was because of the thousands of people like him who dared to experiment and innovate that the times would make progress.

While awe-inspiring, Pei Min also asked his name.

The middle-aged man replied respectfully: "In Xia Ji Nan."

Pei Min suddenly felt familiar and smiled, "I think I've heard it somewhere..." He thought about it, and suddenly slapped his thigh and said, "The craftsman of the modified trunk car seems to be Ji Nan, is it your Excellency?"

His tone changed as a result.

Since ancient times, China has built a country with agriculture and has achieved outstanding achievements in science and technology related to agriculture. As the most indispensable part of agriculture, water conservancy has been committed to the construction of water conservancy projects in all dynasties, both irrigation channels and canals have mobilized a large amount of manpower, material resources and financial resources to build them.

Most of these channels are distributed in major agricultural areas. As for highlands or places far away from irrigation channels and water sources, they are still unavailable.

So the working people in China used their wisdom to invent a water truck that could diversion and irrigate, and used the water truck to introduce the water from rivers and canals into the fields.

Waterwheels appeared as early as the Spring and Autumn Period, but they were just simple tools, relatively rough and not practical. Until the end of the Han Dynasty, Ma Jun invented a keel waterwheel that drew water from low places to high ground, pushing the waterwheel to various places and benefiting the people.

However, the keel waterwheel also has its own shortcomings, such as insufficient power, low water intake, complex structure, and requires human and cow power to rotate.

By the Sui and Tang Dynasties, the keel water truck had gradually been eliminated and replaced by the cylindrical car, but the cylindrical car itself also had shortcomings.

Ten years ago, a craftsman named Ji Nan in Jiangnan improved the barrel truck and used the principle of hydraulic power to allow the bamboo tube to take water independently, divert the water to be transferred into the field, officially telling others about their strength, and fully automated operation.

This brand new tube car is beneficial to the people of the world. After Pei Min took office, he has heard of similar things and still remembers this name fresh.

Ji Nan nodded and said, "I am not talented, I am here."

Pei Min felt awe-inspiringly, and in his heart he was also screaming for Ji Nan, and sighed inwardly: "It's so sad!"

Ji Nan's trolley benefits all the people of the world, but he is an unknown person himself, and he is just a small general. Think about the famous actors who are famous in Chang'an and wealthy in Li Longji's Liyuan.

He bowed deeply to Ji Nan and said, "Ji Dajiang benefited the people of the world and received a certain worship!"

Pei Min did not give Ji Nan time to move, and he preached: "The real reason why Kongming lanterns can be launched into the air is that it is thermal expansion and contraction. When the air expands under heat, the specific gravity will become lighter and rise upwards. As long as there is enough heat, this hot air balloon may definitely carry people to fly to the sky. It was because there was no such condition before. Now we have the Greek fire in the West. With the power of the Greek fire, we should be able to realize the miracle of manned lifting. I want to use the hot air balloon to pass through the 200,000 Arab army and rescue the Feng Changqing Jiedushi and a group of kings trapped in the city."

"Song Dajiang, you are responsible for the preparation and production of materials. Ji Dajiang, follow this monk from the West, to learn about the use and improvement of Greek fire. Whether it can be allowed to rise depends on you!"

Since he discovered a genius like Ji Nan, Pei Min naturally reused it without hesitation.

There is no shortage of talents in this world, what is lacking is the people who discover talents.
Chapter completed!