This technology is currently used in artillery, but the difference between guns and guns is just a matter of size.

Composite barrel technology is also called "iron core copper body" today. The cannon originally cast from pure copper was changed by craftsmen to use wrought iron to make the inner layer, and then the lost wax method was used to make the mold, and the outer copper wall was poured.

Such exclusive technology not only makes the cost of casting guns lower, but also makes the weapons stronger and more durable.

The Gunpowder Department used this technology after receiving Zhu Ying's request.

Nowadays, we do not have the ability to produce seamless steel pipes. If we want the barrel of the matchlock to withstand enough impact without being damaged by the explosion, we can only improve the technology.

That's why the current matchlock gun is much larger than the matchlock gun in Zhu Ying's previous life, especially the barrel, which is actually made of two layers of fine iron.

Daming's current similar core technologies are not limited to these, including waterwheel technology.

After the founding of the Ming Dynasty, faced with constant border wars and a dilapidated internal economy, the anxious Zhu Yuanzhang personally focused on agricultural construction.

In the 25th year of Hongwu's reign, more than 50,000 water conservancy projects have been built on rivers and ponds alone, and millions of farmers have migrated.

In this hot construction, a low-key agricultural technology, the waterwheel, played a key role.

As an "artifact" for irrigation in ancient agricultural production, ancient waterwheel technology has been the world's "highest precision" throughout the ages.

During the Song and Yuan Dynasties before the founding of the Ming Dynasty, new models such as "wind-powered waterwheels" and "animal-powered waterwheels" emerged earlier.

However, in the chaotic years of the late Yuan Dynasty, most of these "new tricks" were limited to individual regions, and their production contribution was very limited.

It was not until the early Ming Dynasty that Zhu Yuanzhang focused on agriculture, and officials from all over the country took agricultural books and drawings and taught farmers step by step how to build waterwheels.

This type of waterwheel, which was originally a "local characteristic", soon began to rumble across the north and south of the Yangtze River. Now, it has boosted the once poor Ming Dynasty, and the agricultural output value has soared.

There is also silk that is selling well all over the world, and the jacquard machine technology is the pinnacle of silk textile technology.

At present, the Ming Dynasty has not yet opened the sea. In the middle and late Ming Dynasty, silk fabrics made with this jacquard machine technology allowed silver from countless overseas countries to be poured into the Ming Dynasty crazily.

After coming out of the military battle station, it was almost dusk, and Zhu Ying didn't notice it at this time.

Lan Yu behind him looked at him with completely different eyes, even vaguely filled with reverence.

Ever since she saw the matchlock gun in the Gunpowder Department in the morning and personally tested the power of the matchlock gun, Lan Yu's mentality has begun to change.

A war involves not only soldiers, but also logistics, equipment, and military power.

Lan Yu, who has experienced many years of war, naturally understands these things.

Although he has not seen Zhu Ying's ability in commanding and training troops, from today's perspective, His Highness Changsun's familiarity with military affairs, especially combat preparations, far exceeds his own.

Among them, what Lan Yu saw most deeply was His Highness Changsun's ambition.

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Chapter completed!