There is a branch of chess in China is artillery, and it is the main offensive arm in chess, two cars, two horses, two artillery and five small soldiers, constituting all the offensive force of chess, and the rest can only defend, and among these offensive forces, artillery is undoubtedly one of the very important core arms, and the importance of the car and horse is the same, if the double artillery is annihilated, the offensive force will be greatly limited.

However, there was no cannon in the original chess, only the artillery this class, that is, the so-called catapult, the weapon used was a projectile stone, so it was next to the stone word, after the Song Dynasty, because of the artillery weapon, therefore, the artillery this class of troops replaced the artillery and became a new class of troops in chess, and its essence is the same, all are long-range attack weapons.

From artillery to artillery, it is not just a change in one word, but a huge increase in the power of weapons, artillery as a catapult, the distance of attack and the power of attack are far less than artillery, and, because it can only be projectile, there is no problem of direct shooting, the accuracy of the attack can only depend on luck, and the artillery because of the barrel, can be directly aimed at the target for bombardment, the accuracy and power are greatly improved, the range of attack is also greatly improved, and the farther and closer places can be attacked.

In the battle of Guandu during the Three Kingdoms period, Yuan Shao built a high-rise building outside the city, condescendingly shot arrows into Cao's camp, causing great losses to Cao's army, and then Cao Cao asked a skilled craftsman to make this catapult and smashed the high-rise building built by Yuan Shao, however, it was a proposed high-rise building, which was built with mud and wooden stakes, and was not very strong, so the catapult could smash it, and in the face of the city wall of Gundam, the role of the catapult was to smash the female wall and soldiers, weaken the combat strength of the defending side, and it was impossible to smash the city wall.

For example, in the fifteenth century, the Ottoman Empire, after having the powerful urban cannon, the difficulty of attacking the fortified position was greatly reduced, and it was precisely because of such a powerful cannon that the Ottoman Empire captured Constantinople, which is known as the city that never falls, so that this huge empire has a new capital.

However, because the fire of the urban cannon was stone, its destructive power was still limited, so Muhammad still paid a great price when attacking Constantinople.

It is said that in order to break through Constantinople, the urban artillery bombarded for forty-seven days, firing a total of 5,000 shells, each weighing as much as 50,000 pounds, and nine gaps were made in the city walls.

Therefore, the attack on Constantinople, the urban cannon is indispensable, but it cannot be said that all the credit is due to the urban cannon, in the process of attacking Constantinople, a large number of Ottoman soldiers have made sacrifices, and many young soldiers are forever buried in this land.

Because the frequency of attack of the Urban cannon is relatively low, there are not many cannons in one night, and the soldiers and civilians defending the city will carry out emergency repairs in the damaged area of the city wall, so that the results of the Urban cannon are greatly offset, and the effect of the artillery bombardment again and again is in vain, and the advantage is suppressed to a certain extent.

In order to cooperate with the bombardment of Urban artillery, the Ottoman soldiers launched one charge after another, but because the walls of Justaninople were too strong, the repaired walls were still strong, so the charging Ottoman soldiers suffered heavy losses.

Subsequently, the urban artillery continued to bombard, and then continued to charge the soldiers, and then bombarded again, again and again attrition, so that the Ottoman army suffered heavy losses, but at the same time, it also caused great losses to the soldiers defending the city, many soldiers not only had to fight hard, but also kept repairing the city wall, and after a long time, they were naturally exhausted, and the Ottoman Empire's troops were more abundant, with enough reserve forces, which could achieve rotational combat and repair, so under such consumption, the defenders defending Constantinople finally could not support, In the end, Constantinople, which was said to never fall, was conquered by the Ottomans.

At that time, if the Urban cannon was replaced with an explosive artillery in later generations, it was estimated that the power would be greater, and Constantinople could be breached in a day, which was definitely not bragging, the ancient defenders could rely on the city wall, as long as the city wall was breached, the army defending the city had no way to defend at all, and could only choose to retreat or be annihilated, for example, in World War II, after a burst of artillery bombardment by the little devils, the city of China basically could not last long, and it was not the city wall that could persist in a long-lasting defensive war. But the huge number of troops and weapons, as well as a steady stream of reinforcements to support, by the way, and the will of the soldiers, in short, in the era of artillery, the city wall has become meaningless, any city wall is not in the ability to defend against the enemy's attack, moreover, it will seriously affect the development of the city, therefore, the city walls that can be demolished are demolished, so as not to affect the development and prosperity of the city, even if it is the city wall of the Tang Dynasty, sooner or later it will be demolished, after the Tang Dynasty is no longer threatened, these defensive city walls, You can dismantle it.

Guo Ziyi walked to the new artillery, gently stroked it with his hand, felt the charming charm of this new weapon, and asked questions from time to time, and liked this new weapon very much.

"How much does this cost?"

Guo Ziyi asked.

"It's expensive, more than double the price of the previous artillery."

Li An replied truthfully.

Weapons have been relatively expensive since ancient times, and the more advanced the weapon, the more it burns money, and ordinary poor countries generally cannot afford to use expensive weapons, so they can only choose to use old goods that have been eliminated by others.

It is precisely because this new one is too expensive, therefore, it is generally difficult for the imperial court to approve large-scale production, no matter how fierce the requirements of the following generals are, the department responsible for approval always refuses to pass, and because the Tang Dynasty does not have a large-scale foreign war, therefore, the generals cannot convince the higher officials, unless the Tang Dynasty is facing a huge threat, those in the imperial court will support the rapid construction of artillery.

For example, in the era when devils were rampant, a certain big country had been busy making money, and it didn't think about weapons at all, even if it developed advanced and powerful weapons, it would not be equipped too much, and the number of soldiers was pitiful, and after being attacked, it suddenly made weapons and produced a huge number of weapons.

Guo Ziyi also understood that the imperial court was indeed reluctant to build such a valuable artillery in large quantities, unless the Tang Dynasty faced a greater threat and must use such weapons to defend the Tang Dynasty.

"Good cannon, really good cannon, forget it, let's go see something else! If there are any other good things, take them out! ”

Guo Ziyi let go of the new artillery in his hand and spoke.

Li An smiled and said, "There are many good things?" Then take you to see some casually! There's a newly developed fire cloth here, as well as knife-proof clothes......"

"Huo Huan cloth, there is really such a thing as Huo Huan cloth in this world, Lao Guo must take a look, and the knife clothes must also be ......"

Guo Ziyi said excitedly.

Huohuan cloth has a long history in the Chinese Empire, and in the pre-Qin period, there was already a fire Huan cloth, according to 'Liezi? Tang Wen recorded that King Mu of Zhou conquered Xirong, and Xirong offered the sword of Kun and the cloth of Huohuan. …… The cloth of the fire and the, the must be thrown into the fire, the cloth is the color of the fire, the dirt is the color of the cloth, the fire is vibrating, and the snow is suspicious. In this ancient book, King Mu of Zhou received a fire cloth offered by Xirong and described its characteristics of washing with fire.

Zhou Shu said: The Western Regions offered fire cloth, and Kunwu offered jade knives. The fire cloth is dirty, and the burning is clean, and the knife cuts the jade like fat. "It turned out that Xirong was adjacent to the Western Zhou Dynasty and had frequent contacts, so they brought the Huohuan cloth to the king of Zhou for friendship, which can also be regarded as a kind of trade.

In the Han Dynasty, there were also a large number of written records of Huohuan cloth. The first volume of "Xijing Miscellaneous Records" records, "During the time of Emperor Wu, the Western Regions offered auspicious Guangqiu, and it was not wet when it entered the water. When you go up, you wear this fur to listen to the court. "This auspicious light fur that is not wet in the water is made of fire raccoon cloth.

In the Eastern Han Dynasty, Huohuan cloth was not only produced in the Western Regions, but also from the Southwest Yi. The Book of the Later Han Dynasty? According to the Legend of the Western Regions, the Great Qin State "made gold coating and fire cloth." "The Book of the Later Han Dynasty? The Biography of Southwest Yi Lie" contains: "And its fire, the gift of taming birds and sealing beasts, accumulates in the inner house." ”

In the middle and late Eastern Han Dynasty, the fire cloth offered by the Western Regions was said to have been obtained by Liang Ji, a relative of the autocratic general. "Fu Zi" said: "When the elder said Han Huan, Liang Ji made a single cloth of fire cloth, met guests, and in front of the courtiers of the wine minister, he feigned that the wine was lost and stained, and he was angry and undressed, and burned it, and the cloth was on fire, and it was as blazing as it was, as burning as a cloth, and the dirt was extinguished, and it was white, like water. That is, Liang Ji deliberately performed the trick of burning the single clothes at the banquet, which left a deep impression on people, and it is still legendary among the elders many years later.

At the end of the Eastern Han Dynasty, the world was turbulent, and the people of the Central Plains did not see the fire raccoon cloth for a long time, so they questioned the fire raccoon cloth. During the Three Kingdoms period, the representative figure who doubted whether there was a fire Huan cloth was Cao Pi, Emperor Wen of Wei. There is a record of clouds: "Emperor Wei Wen was exhausted in the production of goods, and he called himself in the fact that there is no knife to cut jade in the world, and the cloth of fire and Huan." In the meantime, when the two things were completed, the emperor sighed and destroyed the theory. It shows that Cao Pi is very suspicious of the fire raccoon cloth, he has never seen the fire raccoon cloth himself, and ordinary cloth is not fire-resistant at all, so he feels that there is no fire raccoon cloth in this world, as a result, when others brought the fire raccoon cloth to him, Cao Pi was dumbfounded, and only then did he realize that he was shallow, and there was really a fire raccoon cloth in the world.

Later, Cao Pi's son Cao Rui still didn't believe that there was a fire raccoon cloth, and later, when Cao Fang succeeded to the throne, the Western Regions sent the fire raccoon cloth again, which was regarded as auspicious by the court.

That is to say, since ancient times, Huaxia has been able to obtain Huohuan cloth, but they are all tributes from the Western Regions, and the quantity is extremely rare, and the supply is often cut off because of war, which makes Huaxia's Huohuan cloth extremely rare, and even, many nobles have never seen the so-called Huohuan cloth in their lives, so they doubt its authenticity.

By the time of the Western Jin Dynasty, the Central Plains Dynasty opened up a communication route connecting the Western Regions, and the countries of the Western Regions came several times to offer fire and cloth, and the fire and cloth entered China again.

However, because all the small amount of Huohuan cloth in Huaxia was paid tribute from the Western Regions, the Chinese people's understanding of Huohuan cloth was very insufficient, and they even felt that Huohuan cloth was a cloth woven by gods, thus covering this very ordinary cloth with a veil of mystery.

Subsequently, the saying of what fire bark and fire rat skin also became popular, but it is generally believed that the cloth woven by fire rat skin is soft and smooth, and the texture is better than that woven by tree bark.

From the Wei and Jin dynasties of the Han Dynasty to the Sui and Tang dynasties, the Huohuan cloth has been covered with a thick layer of mysterious cultural color, at that time, it was difficult for people to see the Huohuan cloth, and there was no condition to study what the Huohuan cloth was, so these mythical stories were naturally more popular.

In fact, the so-called fire cloth is asbestos, a very ordinary item, only because the Chinese Empire has not mastered this technology, and it needs to be paid tribute from the Western Regions, so there will be a large number of legends and myths.

The reason why the cloth woven by asbestos is called fire raccoon cloth is because this material has strong heat resistance, and will not burn, is very fire-resistant, and is also an insulating and non-conductive substance, which is widely used in all aspects of life.

For example, asbestos thermal insulation products, asbestos rubber products, asbestos brake products, asbestos electrical materials, etc., however, asbestos is more harmful to people, and regular inhalation of asbestos particles will lead to lesions in people's lungs, which is the so-called asbestos occupational disease. This minimizes dependence on asbestos as a material.

The reason why Li An wants to develop seriously polluting asbestos materials, that is because although this material is very polluting, but the use is also very great, in many fields, asbestos has an irreplaceable huge role, is difficult to replace the rest of the materials, and the price is relatively easy to accept, such as some machine insulation materials with asbestos is the best, the use of other materials is always unsatisfactory, and there is that Datang's fire brigade often has to go in and out of the fire, the demand for asbestos clothes is also very large, with such clothes, When extinguishing the fire, the possibility of being burned is greatly reduced, which can well protect the lives of these firefighters.

However, this is only a preliminary research, and then Ang Lee will research a more advanced fireproof material to replace asbestos, which will far exceed asbestos in terms of performance and strength, at least there will be no pollution, and it can also resist strong heat waves, and better protect firefighters from being burned to death.