Passenger ships head east along the Yangtze River all the way.

As you get closer to the Yangtze River Delta region, you can see more and more steam ships along the way, or steam cranes and things like steaming smoke.

Just about 80 kilometers upstream from the passenger ship, there is also a fleet of ships downstream, this is a team of messengers from Li Tang.

In order to express the strength of Li Tang, Li Yuan also tried his best to make three large ships imitating the five-toothed ships of the Sui Dynasty, with non-bronze artillery installed on them.

That's right, it's a bronze cannon.

Obviously, the firearm technology of the People's Revolutionary Federation is too oppressive to the forces of all parties, and at the same time it is also forcing them to develop firearms.

Through a small amount of rifles, Li Tang organized a huge amount of manpower and material resources, and finally developed a front-loaded bronze artillery with all his strength in research.

However, their technology is relatively backward, and there is no way to produce safe high-performance explosives. They can only use the black powder developed by alchemists.

But this technology is also very terrifying, because there are imitators, Li Tang's artillery development route directly enters the level of rifling, fixed-load propellant, and blooming bullets.

Even because there is no qualified bullet and shell production technology, they adopted the sub-barrel technology, which is similar to the bullet-in-one shell, but with relatively simple and primitive technology.

The emergence of this technology allowed Li Tang to quickly gain a certain strategic deterrent power, especially for Tuyuhun without firearms, Liang Shidu, Liu Wuzhou, and even the overlord of the grasslands, Dong Tiele, who had no firearms.

Of course, bronze artillery is not so easy to play, because bronze artillery consumes too much copper, even if Li Tang takes out a large amount of copper coins in stock, and with the support of Cihang Jingzhai, there is no way to mass-produce it.

According to the intelligence of the black-clothed guards, Li Tang has produced a total of 67 bronze artillery guns. This time, the five-toothed ship of the messenger team is equipped with 12 guns.

At the same time, 24 artillery pieces were installed on both sides of the Three Gorges Waterway in Badong County, forming the Badong Line of Defense.

The remaining artillery pieces were all put into the Northern Expedition, and Li Shimin personally led the Tiance Army to attack Liu Zhouwu, who had occupied Jinyang.

Obviously, Li Tang knew very well that once the People's Revolutionary Federation digested and completed the new territory, the war to unify the world would soon come.

If he did not take advantage of this spare time to eradicate Liu Zhouwu and Liang Shidao, who had been threatening the Guanzhong Plain, and at the same time beat up the Tiele people who were spying on the Central Plains, Li Tang had no way to deal with the People's Revolutionary Alliance with all his strength.

On the flagship of the Li Tang mission, the valiant Li Xiuning, the nominal consort Chai Shao, and the concubine Xuan, who dressed up as Li Xiuning's personal guard, were standing on the ship building, overlooking the rolling Yangtze River.

Li Xiuning held a monocular in her hand, the lens above it was polished with transparent crystal, and she watched the boats coming and going on the river.

"The technology on the steamboat, I don't know why."

Concubine Xuan, who goes by the pseudonym Qin Chuan, smiled and said, "According to the investigation of my monks, the magic technique on the steamboat is a technique of burning coal, boiling a water stove, and using steam to propel machinery."

"It doesn't sound like this technique is difficult!" Li Xiuning said in surprise.

But Chai Shao, who has been in contact with many technical imitation projects, smiled bitterly: "Miss, the principle is very simple, the problem is the material."

"..." Li Xiuning immediately reacted.

The material problem is indeed the feeling. Although they imitated the artillery, the artillery of the People's League is light and durable, and the power is very powerful.

The bronze artillery they imitated weighed more than three thousand kilograms, and could only be installed on warships or city walls.

The technology involved in steam engine technology, in addition to machining accuracy and mechanical design technology, is a material problem.

The high-strength alloy steel and the sealing rubber ring used for sealing are definitely difficult to make the scalp tingling.

Especially for the classical era that did not complete the accumulation of technology, without decades of painstaking research, coupled with the support of huge human and material resources, it is simply wishful thinking to obtain a practical steam engine.

Gu Shan

After successfully liberating the entire middle and lower reaches of the Yangtze River, Longsha quickly organized exploration personnel to encircle the wild Eucommia eucommia trees in Dabie Mountains, Wuling Mountains, and the east side of Qinling Mountains.

On the one hand, the local people are organized to collect the bark, leaves and seeds of Eucommia, because these can be used to make rubber.

On the other hand, a large-scale Eucommia forest farm was established in Wuling Mountain.

At present, the Human Revolutionary Federation can produce about 150 tons of eucommia glue per year, and with the dandelion farm in Liuqiuzhou, it can produce 60 to 80 tons of dandelion glue per year.

At the same time, in Qilu Prefecture, tens of thousands of acres of dandelion farms have also been opened, and the production of dandelion glue can be increased by 200 to 250 tons next year.

With the expansion of production in the Eucommia forest farm in Wuling Mountain, the production of natural rubber by the Human Leather Federation will increase rapidly.

Longsa is also studying the manufacture of artificial rubber and plastics through coal tar, but these two things, even if they are developed, will not be put into the civilian field.

After all, artificial rubber and plastic are difficult to degrade, and they can easily enter the ecological cycle through domestic waste.

According to Zheng Sen and Longsa's plan, artificial rubber and plastics will only be used in industrial equipment manufacturing, special industries, and military fields.

In the civil field, if natural rubber can be used, natural rubber should be used as much as possible.

Eucommia and dandelion have low gum production?

The big deal is to strengthen the improvement of varieties. Some of the fine Eucommia trees in later generations can reach an annual yield of 40 kg of raw rubber per mu after combining with chemical fertilizers and agricultural technology.

With the support of chemical fertilizers and agricultural technology, the quality of dandelion gum can yield 12-15 kg per mu, and two to three crops can be planted a year with an annual output of about 24-45 kg.

It takes 6 to 8 years to reach the rubber tapping period, and the annual yield of raw rubber is about 100 to 150 kilograms per mu.

It seems that it is not insurmountable, especially dandelion gum, which has great potential for variety improvement, and also has the advantage of large-scale mechanized production.

After all, the difficulty of improving arborescent plants is much higher than that of improving herbaceous plants. Since there are high-yield hybrid rice and hybrid wheat in later generations, why can’t there be hybrid dandelion?

As for the poor heat resistance, abrasion resistance and ultraviolet resistance of dandelion glue, there is also eucommia glue as compensation, and Hevea can be planted in Southeast Asia in the future.

Form the industrial layout of temperate zone - dandelion, subtropical zone - Eucommia, tropical zone - rubber tree.

Why did the eucommia gum and dandelion gum industries fail to develop in later generations?

In fact, it is not entirely a big difference in the glue. UU reading www. uukanshu.com

Instead, it involves a strategic game of various forces. Southeast Asia and South America in later generations are basically America's sphere of influence. Naturally, they do not want natural rubber, a strategic material, to be mastered by other forces.

The output is too low, the cost is too high, and the gum is difficult to compete with Hevea. In addition to the impact of free trade, the eucommia industry in East Asia and the dandelion industry in Central Asia are rapidly declining.

At present, the People's Revolutionary Federation has no idea of ​​developing free trade. The problems of yield per mu and production costs can sometimes be offset by institutional advantages.

Therefore, the People's Revolutionary Federation will continue to invest in Eucommia forest farms and dandelion farms to carry out variety improvement programs.

As far as possible, people can use safe natural rubber products instead of artificial rubber and plastics that are difficult to degrade.

On the Yangtze River waterway, the Li Tang mission was still drifting towards Yangzhou City.

At present, Yangzhou City is the temporary capital of the People's Revolutionary Federation.

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