Under certain initial conditions and a certain external moment, the gyroscope will rotate around another fixed axis while constantly rotating, which is the precession of the gyroscope, also known as the gyroscopic effect. Gyroscopic spirals are a common phenomenon in everyday life, as exemplified by the spinning tops that many people played with as children.

Such a turning effect has been found in scientific experiments in Qin's country. And it's called the spin effect. And on this principle, the earliest gyroscope was manufactured, and the appearance of the gyroscope will be beneficial to Qin's aerospace and ballistic missiles.

However, at present, this technology is gradually being experimented, and it will take a long time to carry out large-scale application. But it takes a lot of time, money, and manpower to study. And it also requires a large market demand to stimulate. However, there is such a long period of utilitarianism in Qin, and it is difficult for things that are useless in a short period of time to have a survival market. Such a pragmatic approach is sometimes undesirable. What Shang Wen is worried about is Qin Guo's education method and scientific research methods. If you can't dive into research. Sooner or later, Qin was overtaken by other countries in the field of science and technology.

But a new weapon has proven the existence of this idea. Qin currently has two types of gun cartridges, rifle cartridges and pistol cartridges. Because of the Wenyang Arsenal, the intermediate guns and bullets of the Qin State were suppressed.

With the advent of machine guns such semi-automatic, automatic weapons. Gunsmiths are beginning to turn their attention to automating firearms. But soon the gunsmiths found a problem. That is, with rifle rounds, the huge recoil will cause the user to jump up. resulting in a decrease in accuracy. The solution is to increase the body of the gun. Or take another approach. But there is still a lack of such a balance between guns and bullets.

Just as gunsmiths were focusing on rifles that used rifle cartridges, another weapon was introduced. A submachine gun using dot-40 pistol cartridges was introduced, which was invented by an unknown firearms repairman. The gun was converted from an old-fashioned rifle, because the repair rifle existed in such a firearm by a lot. The repairman thought that instead of spending a lot of attention on researching and improving firearms. It is better to use less powerful pistol bullets. With the use of pistol cartridges, this problem is much reduced.

And the rate of fire increased significantly. The rate of fire reached an astonishing four hundred rounds per minute. But usually no one does. The bolt adopts a free-style bolt machine. The barrel is an air-cooled tube that has been cut. A three-two round magazine was used. The magazine was transferred from the left side. The unknown gunsmith had invented a remarkable weapon for himself, and he was excited to show it to the military. But the military shook their heads. Mainly, he fought too closely. Only about one hundred and twenty steps. If you use a longer bullet, you may increase this distance. But this distance is too risky, and there are still big problems with the accuracy of shooting. The muzzle jumps upwards in the way the bullet rate of fire is high, which is one of the shortcomings that all submachine guns find difficult to overcome, and this upward jump leads to the low accuracy of the submachine gun. Especially in the case of continuous firing.

"This rapid-fire short special rifle is really useless, and it is a waste of bullets. The rate of fire is fast. But the power is on the low side. And the rate of fire is shorter at a distance. You know, our opponents, the Huns, could also shoot bows and arrows of more than a hundred paces. If it is used against the armies of those six countries. The opponent's rifle can shoot a distance of more than 200 paces, and this weapon will not be able to reach the opponent at this time. This weapon is just terrible. Junk level weapons. A Qin army officer commented on the weapon. It is clear that the Qin army has not yet been prepared to be equipped with submachine guns and all kinds of foundations. You must know that at this time, the Qin army was still not equipped with a large number of mechanized armored vehicles. The object of the battle is still fighting in the wilderness. Shooting distance has always been an important reference criterion. Moreover, the Qin army's combat targets were steppe nomads with the same strong mobility, and these nomads were best at bows and arrows, and the combat distance of 120 steps of submachine guns was obviously not in line with the Qin army's idea of avoiding the opponent's bow and arrow shooting. So this weapon was eliminated, and it did not attract much attention. In this way, the state of Qin once again passed by the submachine gun.

However, the Lee Arsenal was interested in the weapon, as they smuggled a large number of rapid-fire pistols. Their pistol was a crankshaft pistol, and the pistol used was a dot-40 pistol cartridge. The pistol's long rounds, combined with the fact that it is equipped with a wooden butt and a slender barrel, allow it to shoot at distances of more than 200 paces. However, because of its peculiar structure and relatively expensive construction, this pistol often lost to the simple 17th Division Point 50 pistol of the Wenyang Arsenal in the fight for pistol orders on the Eastern Front. And the Qi State does not imitate this pistol. As a result, Lee's Arsenal lost a large part of its orders. To compensate for this phenomenon. Lee's Arsenal took a different path. Look for a weapon with a faster rate of fire than the Type 17 pistol, in weapon testing. Li You discovered this weapon, which Qin Jun considered junk-grade, and bought the patent for the gun for twenty gold. It then switched to the production of a hundred Qi troops for free on the Eastern Front.

This is the secret weapon of the Qi army, the submachine gun. The Qi army had a large number of commandos, and more and more commandos began to complain about the disadvantages of pistols. Fighting in a small trench, the first most important thing is to suppress the opponent's firepower. In the face of the Yan army using rifles, the Qi army naturally had the upper hand, but if it was a revolver, this kind of loss would be a big loss. The Qi commandos needed to keep pulling the trigger to fire continuously, but even this could not suppress the opponent's machine gun fire.

Unfortunately, the pistol's 13-round magazine was still insufficient. If fighting in a narrower area, the pistol's fire suppression appears very weak. At this time, the appearance of submachine guns allowed the Qi army to see an exciting weapon that made them novel.

"This weapon is faster than the Yanren's revolver machine gun, and under normal circumstances, it only takes a blink of an eye to shoot out thirty-two bullets in a magazine, and this feeling is indescribable." Commandos who used such submachine guns called them "small machine guns." Or "hand-held machine guns." "The appearance of submachine guns largely solved the problem of insufficient firepower of the Qi army.