In order to eliminate Wuheng and improve the combat effectiveness of the Liaodong Army. Gongsun Kang also urged the artisan battalion to upgrade its weapons.

There are a lot of things to prepare this time: a saddle, stirrups, horseshoes, Xiangyang iron knives, repeaters, compasses, and telescopes made of bamboo tubes.

Saddles and stirrups were already in use at this time, and Gongsun Kang was not an invention, but only a promotion.

The horseshoe also has no technical content, Gongsun Kang drew a drawing, and then explained it in person, Zhang Huaiyuan made a sample. The horseshoe is indeed an epoch-making invention that improves the combat effectiveness of war horses.

A lot of technology is like this, and no one has discovered it for thousands of years; Once someone uses it, it is a layer of window paper, which can be understood at a glance and learned as soon as you learn. The reason why Gongsun Kang did not come up with the horseshoe for a long time was because after it appeared on the battlefield, it would soon spread throughout the Han Dynasty. While increasing your own combat effectiveness, you also improve the combat effectiveness of the enemy.

However, at present, Liaodong already has tens of thousands of cavalry, and the cavalry training is not easy, so it must be equipped with saddles, stirrups, and horseshoes to reduce battle losses.

The Xiangyang Iron Knife was an exclusive invention of Qi Wuhuaiwen as his apprentice. Zhang Huaiyuan is naturally proficient in all production processes.

In the past year, Zhang Huaiyuan has led people to build 1,000 Xiangyang iron knives. According to Gongsun Kang's suggestion, these Xiangyang iron knives have long handles, which are equivalent to horse chopping knives.

In the craftsman camp, Gongsun Kang took Zhao Yun to test the knife.

Zhang Huaiyuan asked someone to bring an iron rod. erected on the ground.

Zhao Yun swung his knife and slashed it, only to hear a snort, and the iron rod was broken into two. Looking at the Xiangyang iron knife again, the edge of the blade has not changed, and there is no curling at all.

"Good knife, really sharpen iron like clay!" Zhao Yun blurted out praise.

Gongsun Kang was overjoyed and ordered to reward meritorious craftsmen, especially Zhang Huaiyuan, rewarding him with thousands of acres of fertile land, 100 slaves, and 100 taels of gold.

Everyone knelt down to thank them, and Gongsun Kang encouraged them to make persistent efforts and continue to build the Xiangyang Iron Knife.

As for the repeater, the Han army originally had the technology of the repeater, and the repeater was the submachine gun of this era. The battle of the boundary bridge made everyone in the world see the power of the crossbow.

Many people believe that the repeating crossbow was invented by Zhuge Liang, so it is also called "Zhuge crossbow". In fact, this is not the case, Zhuge Liang just improved the repeater.

The wooden crossbow unearthed from the tomb of the Warring States Chu provided by the Jingzhou City Museum in Hubei Province in later generations, this should be a fragment, the combination of the arrow box and the crossbow arm is well preserved, the length is only 27.8, the height is 17.2, the width is 5.4 cm, because it has been sleeping in the ground for more than 2000 years, the wood is carbonized to black and swarthy, its appearance is not good, and it is not very eye-catching. But as far as we know, it is the earliest and only one-of-a-kind repeating crossbow that can fire two arrows at a time in China, and it is a very important invention in the history of ancient Chinese weapons and mechanical thought, and it is an ancient scientific and technological cultural relic that can be called a national treasure.

In the second year of Emperor Wu of the Han Dynasty (99 BC), Li Ling led the army to fight against the Xiongnu.

During the Three Kingdoms period, the Zhuge crossbow was also an actual combat weapon. Probably because of its complex structure and high technical content, it was almost submerged in the wars of later generations, and Song Yingxing of the Ming Dynasty thought that it was only a non-military weapon.

Repeaters can fire bolts continuously. However, due to the fact that the arrows used in the repeater do not have arrow feathers, the iron arrows will lose their balance and roll over when flying at a long distance, and the production of wooden arrow shafts requires high precision, and it is difficult to make them manually, and it is not easy to manufacture and use them in large quantities. After the Ming Dynasty, due to the rapid development of firearms, crossbows were no longer valued.

Gongsun Kang asked to make iron arrow shafts, 10 in a box, and the range was 30 meters. After each shot, it sinks by gravity and is automatically loaded.

Zhang Huaiyuan said that it is a bit difficult, but it can be solved, and it is expected that 100 repeaters can be produced within two months.

Gongsun Kang said: "The output is too small", he knows that the bottleneck of production is the lack of craftsmen.

So he begged with the system Xiaojia softly: "Xiaojia, give my brother some craftsmen, you don't need to be at the master level, as long as you are an ordinary craftsman." ”

Xiao Jia despised him: "Now that Liaodong has a population of 1.5 million, isn't it more than enough to recruit 10,000 craftsmen?" It also wastes the system's precious lottery places. ”

Yes, in this era, craftsmen have no status, and they are inferior to farmers who farm.

Gongsun Kang ordered the recruitment of 10,000 craftsmen with high salaries in the three counties of Liaodong, with a monthly salary of 2,000 yuan. The gathering of servants solved the problem of shortage of craftsmen at once. These newly recruited craftsmen are just hands-on, making the parts of various weapons that do not need to be kept secret, and even so, the efficiency of the artisan battalion has increased by dozens of times.

All that's left is a compass and a telescope.

The compass is also a simple structure, after Gongsun Kang explained, Zhang Huaiyuan said: You can find a magnet to try to make it, there should be no problem.

As for the telescope, when it comes to the problem of glass, Gongsun Kang did not teach Zhang Huaiyuan, he needs to operate glass as a luxury product, ready to make a lot of money.

For a long time, military supplies have been supervised by Zhang Huaiyuan; The civilian products have always been produced by the private workshop of the Gongsun family. Gongsun Kang is very clear.

How is glass made? Later generations knew that glass was made of sand.

In fact, modern flat glass is made of float glass. It is made of sea sand, quartz sandstone powder, soda ash, dolomite and other raw materials, prepared according to a certain proportion, melted at high temperature by the melting kiln, the liquid glass flows continuously from the pool kiln to and floats on the surface of the molten metal, spread into a glass belt with uniform thickness and polished by fire, and then separated from the molten metal after cooling and hardening, and then annealed and cut into transparent colorless flat glass.

Glass general glass raw materials are burned and dissolved to form a liquid viscous liquid, to make it cool and form, most of them use the type blowing method, using a variety of material models, such as wood, clay, metal and other pre-made required molders, the melted glass liquid is poured into the model, and then the model is opened after cooling, generally used for blowing glass can not be made of appliances, most of the factories use this method, can be produced in large quantities.

The other is the blowing molding method, that is, blowing glass, that is, taking out an appropriate amount of glass solution, placing it at one end of an iron blowpipe, blowing on one side, rotating on the other, and using scissors or pliers to shape it with skillful techniques.

Of course, Gongsun Kang didn't have the patience to experiment and explore on his own, so it was enough to leave the basic principles to the craftsmen in the family, and then give enough manpower, material resources, and financial support.

Professional things should be done by professionals, and Gongsun Kang believes in this.

As long as glass can be produced, it can be ground out of concave and convex mirrors, and with the addition of bamboo tubes, single-hole telescopes are made.