The sniper starts from the bright sword escape period

Chapter 417 The vernier caliper that is more than one year old
Because they were in a hurry to produce the finished product, the two blacksmiths did not use iron to make it. Instead, after drawing the blueprint, they directly used the method of mold casting to manufacture a copper rear-loading fixed-fire gun.

The rear-loading firecrackers produced by this are similar to the reduced version of the Francois machine gun.

After testing, the rate of fire of this kind of post-loading is really extraordinary. It can already shoot eight or nine rounds in one minute. This rate of fire is not as good as a matchlock gun, even a flintlock gun. You must know that even a flintlock gun The rate of fire is only three rounds per minute.

After all, no matter whether it is an arquebus or a flintlock gun, there is a troublesome problem that cannot be avoided, that is, front loading, so it is natural that the fixed volume loading of the rear hall is faster than that.

However, Blacksmith Zhang asked his apprentice to pull the wooden target over to take a look, and his originally happy expression immediately collapsed. Even Prince Zhu Biao looked at Bai Lixiu with a wry smile after seeing the wooden target. said:

"Sir, although your post-loading method can increase the rate of fire, the power of this firecracker is also reduced a lot! With such power, it is difficult to penetrate Beiyuan's leather armor! If you want to penetrate Beiyuan soldiers The leather armor has to pierce through this wooden target!"

That's right, although the Frang machine gun adopts rear loading, which allows it to have two or three times the rate of fire, but the shortcomings of this Frang machine gun are also inherited, that is because the gap between the top loading barrel and the barrel The gap in the bullet is too large, which leads to the lax seal and air leakage naturally occurs. Once the air leaks, the force to push the projectile will naturally decrease, and its power will also decrease.

However, Bai Lixiu did not answer Zhu Biao's words, but instead asked with confidence:
"Then I wonder if His Highness the Crown Prince knows what caused the power of the lead to drop?"

Regarding Bailixiu's words, Zhu Biao naturally saw the reason. Zhu Biao saw it when he was shooting, so he immediately replied without thinking:

"Naturally, this is due to the laxness of the barrel of the charge and the wall of the gunpowder, which caused the power of the gunpowder to leak!"

"Does His Royal Highness have any solution?"

The reason why Bai Lixiu asked this question was naturally to arouse Prince Zhu Biao's thinking. After all, everything was handed over and told, and it would result in knowing what happened but not knowing why, which would lead to inflexibility.

Sure enough, Prince Zhu Biao thought for a while after hearing Bailixiu's words and said:
"The cartridge can be made just right for the tube wall of the firecracker, so you don't have to worry about leaking!"

It's just that Zhu Biao just said this, Li Tiejiang on the side said:

"Your Highness, this is already the highest precision. It is very difficult to make it just right."

Bai Lixiu shook her head helplessly, feeling that these ancient blacksmiths were really clueless!

Before, he got a machine tool to process the rings and rollers of the roller bearing. Didn't they find that this machine tool can also be used to make guns and other firearms!
You must know that in the history that Bailixiu knows, some technological applications are given priority to the development of weapons!
But seeing that the blacksmith was so clueless, Bai Lixiu could only speak up and say:

"Didn't you find out that the gun barrel and powder barrel can also be processed by machine tools to improve accuracy!"

It's just that Bailixiu saw that the two still didn't know how to adapt, so she could only shake her head and sigh and demonstrate it herself. Bailixiu first used the Xingyun carving knife to make a turning head, and then used this turning head The inner wall of the copper tube is polished and smooth, and then the copper gunpowder barrel, that is, the cartridge case, is placed on the machine tool to process the diameter of the outer wall.

Of course, during processing, Bailixiu also uses a vernier caliper to measure some outer wall diameters from time to time, and it is a vernier caliper.

Of course, the vernier caliper was not made by Bailixiu on site, but has been around for a long time. Many people take it for granted that the vernier caliper was invented by Westerners, but this vernier caliper was invented as early as the Wang Mang period of the Han Dynasty. , more than 1000 years earlier than the one in the West

A vernier caliper is a measuring tool for measuring length, inner and outer diameters, and depth. It consists of a main ruler and a sliding vernier attached to the main ruler. It is widely used in various modern processing industries.However, the earliest appearance and application of calipers in the world should be traced back to the new dynasty period established by Wang Mang in the late Western Han Dynasty in China.Although the new dynasty established by Wang Mang in history was only a few decades old, this man has made a lot of contributions, which is enough for history to remember him deeply.

Wang Mang of the Western Han Dynasty was the founding emperor of the new dynasty and reigned from 8 to 23 AD.

Wang Mang was born in the late Western Han Dynasty. He was a member of the family of the Wang family. The queen mother, Wang Zhengjun, was his aunt. The Wang family lived extravagantly and sensually. The alternative in the aristocratic family has become what the parents call "other people's children".

Emperor Ai of the Han Dynasty died, and the Queen Mother ordered Wang Mang to be the chief minister, record the affairs of the minister, and also manage the military orders and the forbidden army. The power was all in the hands of Wang Mang. The masses built resettlement houses to resettle the victims, and all officials in the court followed suit.All the people in the world called Wang Mang a saint.In the eighth year of AD, Wang Mang successfully accepted Ruziying's abdication and proclaimed himself emperor. The government and the public cheered for this, and almost no one objected.

After Wang Mang became emperor, he attached great importance to scientific research. According to legend, Wang Mang heard that someone had made an aircraft out of the feathers of a big bird, so he personally summoned the man and encouraged him to continue to work hard to invent.

And personally participated in the invention, and the representative one is the bronze caliper, which intends to unify the measurement of the whole country. From the perspective of principle, performance and use, this bronze caliper is very similar to the modern vernier caliper.

A copper caliper from the Xinmang period is treasured in the Huaxia History Museum.The total length is 14.22 cm, and it is composed of fixed ruler, fixed claw, fish-shaped handle, guide groove, guide pin, combination sleeve, movable ruler and movable claw.Five inches are engraved on the front of the movable ruler; five inches are also engraved on the front of the fixed ruler, except for the one inch on the right end, the four inches on the left are engraved with ten cents for each inch.There is a fish-shaped handle on the upper part and a guide groove in the middle.The two claws are merged, the fixed ruler and the movable ruler are equal in length, and the engraved lines of the two chi are generally opposite.The fixed ruler and movable ruler of the caliper are equivalent to the main ruler and auxiliary ruler of the modern vernier caliper.The combination sleeve, guide pin and guide groove are equivalent to the vernier frame of the modern vernier caliper, and the structure is similar.

To use a copper caliper, you should hold the fish-shaped handle with your left hand, and pull the ring handle with your right hand, and pull it left and right to measure the workpiece.It is more convenient and accurate than using a straightedge to measure cylinders, circular section diameters, tenon and groove depths, and the length, width, and thickness of utensils.The maximum measurement limit of this caliper is four inches, so there is no need for graduations when the right end of the ruler is one inch.As far as its principle, performance and usage are concerned, it is a primitive vernier caliper, which should be regarded as the originator of modern calipers.

One side of the fixed ruler is marked, and the other side is engraved with seal script "3" in the first month of the first year of the founding of the People's Republic of China. "Hanshu Wang Mang Biography" contains: Wang Mang took Guiyou as the first month of the first year of the founding of the People's Republic of China to show the reform, and the first year of the founding of the country was 9 AD.This copper caliper from the Xinmang period is the earliest caliper preserved in my country today.At that time, at the beginning of the first century AD, it was the earliest vernier caliper in the world.

(End of this chapter)