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Yao solemnly picked up a bronze sword, slowly handed it to Yi Huawei, and began to explain seriously:

"Sir, the mixing ratio of bronze and tin is indeed the key to casting a bronze sword. I have just explained to you in detail that with a ratio of four parts bronze to one part tin, the hardness and flexibility of the gold water will reach the most perfect level, which is the prerequisite for the sharpness of the Qin sword. (The bronze ratio is 73%-76.32% copper and 18.02%-21.4% tin. This scientific ratio is obtained through repeated experiments and summaries.)
The secret to Qin Jian's sword surpassing the common norm and reaching more than two feet and six inches lies in its unique appearance. Sir, please see, there is a length of two inches and two from the hilt to the blade, which is called the sword guard.

The guard is wider and thicker than other parts of the sword. The purpose of this design is to greatly enhance the solidity of the foundation of the sword. From the guard to the blade, the orchid-leaf-shaped blade gradually narrows, with a vertical angle between the two blades, and the blade has eight sides. Next is a concave waist, which gradually widens after the waist.

This waist is very important for the length of the double-edged, eight-sided Qin sword. It can act as a "wind groove" to increase the speed and power of stabbing when the sword is swung. At the same time, the thickness of the sword body will be reduced accordingly where it is wide, and the thickness of the sword body will be increased where it is narrowed. The degree of width and thickness can be said to change in opposite directions.

This complex and exquisite design can strengthen the force-bearing part of Qin Jian while maintaining a certain elasticity. At the same time, it will not make the sword too heavy, which is very conducive to close combat. This is the top-secret technology that makes my Qin Jian more than four feet long! "

When Xi was explaining, there was a gleam of pride in his eyes, as if the bronze sword in his hand carried the glory and splendor of the Qin State.

"I see!"

Yi Huawei nodded slightly and took the unfinished super-long Qin sword beside him. The sword body emitted a faint cold light.

Yi Huawei picked up the bronze sword and pointed it at a piece of waste wood beside him, and chopped it down lightly. With a "crack", the sword broke the wood, clean and neat. The two-inch thick wood was so fragile under the power of Qin Jian, like a piece of thin paper that could not withstand a single blow. You know, this is just an unfinished semi-finished product! And Yi Huawei did not use any force, just a casual wave of his hand, and it had such an amazing effect.

"What a good sword, it's no worse than an ordinary meteorite iron sword!"

Yi Huawei's eyes showed appreciation, and he nodded with a smile. He gently stroked the sword, feeling its unique texture and sharpness.

I don't think I've tried the power of the Tai'a Sword yet? Go back and try it.

Qin Shi Huang had three famous swords, Tai'a, Lulu and Dingqin. When he was buried, Yi Huawei left the Dingqin sword beside Qin Shi Huang and put away the Tai'a sword. The Lulu sword was the sword worn by the kings of Qin in successive dynasties and is now in Hu Hai's hands.

Entering the third craftsman's room, Yi Huawei felt much cooler, as if he had instantly stepped from the hot summer into the cool autumn. Looking up, he saw thousands of craftsmen in the room busy in two groups, each concentrating on the work in their hands.

One group of craftsmen was concentrating on making crossbows, their fingers nimbly moving between various materials, polishing or assembling, each movement full of strength and skill. Another group of craftsmen was carefully making arrows. They selected the best quality wood and metal, and after fine processing, made each arrow extremely sharp.

A row of finished crossbows were neatly displayed on the shelf, divided into three types from large to small. The length and width of the small crossbow arm and crossbow were only more than 40 centimeters, delicate and compact, easy to carry. The lines were smooth, and although small, they contained great power. The length and width of the medium-sized ones were nearly one meter, steady and majestic. The crossbow body exuded a metallic luster, giving people a sense of solidity and reliability. The large one was completely in the shape of a heavy crossbow machine, lying there like a group of entrenched tigers, chilling and chilling.

Yi Huawei's eyes were fixed on a protruding square-shaped metal object at the end of the crossbow arm. He raised his hand slightly, pointed at the object and asked, "What is this?"

Hearing this, a smile appeared on his face, and he replied respectfully: "My Lord, this is called Wangshan, and it is used by crossbowmen when aiming and shooting arrows!"

Yi Huawei's eyes flashed with surprise, and he was secretly amazed. The weapons of the Qin Dynasty had reached such an advanced level that they even had sights. His curiosity was aroused, and he asked, "How do you aim?"

He leaned slightly to the side, pointed to an infantry crossbow beside him, and patiently explained: "Please look, sir. There are six eye-catching black lines on this infantry crossbow, which are used to estimate the shooting distance. When shooting, the crossbowman estimates the height of the crossbow according to these six black lines, and then shoots the arrow in an arc. Finally, it accurately hits the enemy soldier. These six black lines are: 50 steps, 100 steps, 150 steps, 200 steps, 250 steps, and 300 steps of aiming lines!"

Yi Huawei nodded. No wonder when Zhao Kuo personally led the army to break out of Changping, the history records that the Qin army fired arrows like rain, almost all of them hit the target, even Zhao Kuo was shot dead in front of the battle. Such precise shooting must be inseparable from these advanced weapons and the superb skills of the crossbowmen.

After a pause, Xi continued, "In fact, this Wangshan has another crucial function. My lord, please see that the firing mechanism of the Qin crossbow is cleverly composed of seven or eight parts of different sizes, and each part has been carefully polished and fits perfectly. The firing mechanism of the crossbows of the six countries in Guandong, such as the Han crossbow, is only about half of the parts of the Qin crossbow. Generally speaking, when shooting with a crossbow, the crossbowman has to rely entirely on the strength of his fingers to push the extremely tight bowstring into a crescent shape, which undoubtedly requires a huge amount of effort. At the moment of firing, the crossbow will inevitably produce a great deal of shaking, so that the accuracy of the shooting will be greatly reduced. However, the Qin crossbow is completely different. Although its shooting mechanism is complex, it is designed to be extremely delicate and flexible. When shooting, the crossbowman only needs to gently pull the trigger to shoot the arrow smoothly through the shooting mechanism. The shaking during the whole process is extremely small and almost negligible.

Because of this, the power and accuracy of the Qin crossbow can be said to be the best in the world! And this Wangshan, when the arrow is shot and the string is re-strung, it can automatically pull the trigger back to the firing position. This is because the Wangshan is also closely connected to the exquisite shooting mechanism! "

…………

After visiting the third institute, Xi led Yi Huawei to the fourth institute with a respectful look.

As soon as I stepped into the Fourth Crafts Office, I was greeted by a majestic atmosphere. This is a place that specializes in producing large weapons such as spears, halberds, and halberds. Busy figures of craftsmen shuttled through the huge space, and the sound of hammers hitting metals rose and fell.

The spears were like a forest, lined up straight on the side, and the spear tips were flashing cold light, as if telling of their sharpness.

The production of each spear is very particular. The craftsmen first select high-quality metal materials, smelt them at high temperatures, remove impurities, and make their texture purer. Then, pour the molten metal into a special mold, cool and form it, and then finely polish it. The spear shaft is made of tough wood, which is dried and processed to make it less likely to bend and deform. Finally, the spear tip and the spear shaft are firmly connected to ensure that they will not break easily in battle. The halberd exudes a majestic atmosphere and is unique. It has both a straight spear head and horizontal twigs that can be stabbed or hooked, and it is very powerful. The process of making a halberd is more complicated. It is necessary to cast the spear head and twigs separately, and then combine them together through clever connection methods. The craftsmen use a special mortise and tenon structure at the connection part, so that the various parts of the halberd are closely combined and integrated. At the same time, in order to increase the beauty and practicality of the halberd, exquisite patterns such as tiger patterns and dragon patterns will be carved on the halberd, which not only highlights the majesty of the Qin State, but also improves the recognition of the halberd.

The appearance of beryllium is similar to that of a long sword, but it is thicker and more powerful. The production of beryllium requires superb skills. First, the metal material must be forged into a suitable shape, and then it must be repeatedly quenched and tempered to increase the hardness and toughness of the beryllium. During the polishing process, the craftsmen must ensure that the surface of the beryllium is as smooth as a mirror without any flaws. Finally, the beryllium must be equipped with a suitable hilt and guard to make it easier to hold and use.

The craftsmen were working attentively. Some were forging spear tips. The fire was blazing, burning the metal red hot. They then hammered it repeatedly with a hammer to make it harder and sharper. Some were assembling the parts of the halberd, meticulously adjusting every connection to ensure that it was firm and reliable. Some were polishing the blade of the beryllium. Their movements were skillful and delicate, making the surface of the beryllium as smooth as a mirror.

After leaving the fourth workshop, Yi Huawei and Qi came to the fifth workshop, which was the armor workshop. As soon as they entered the workshop, they saw countless armors and shields neatly arranged, emitting a metallic luster.

There are many types of armor, including light armor and heavy armor, suitable for different types of soldiers and battle scenes. Shields come in different shapes such as round and square, some are as huge as door panels, and some are small and flexible, each with its own characteristics.

The production process of armor is equally complicated. First, craftsmen have to design suitable armor styles according to the soldiers' body shapes and combat needs. Then, high-quality metal materials such as iron sheets and copper sheets are selected, and the various parts of the armor are made through cutting, stamping and other processes. Next, these parts are assembled and connected by rivets, silk threads and other methods to ensure the firmness of the armor. In order to improve the protective performance of the armor, a layer of soft leather or cloth is added to the inside of the armor to reduce the impact. Finally, the armor is surface treated and coated with anti-rust paint or decorative patterns to make it both beautiful and practical.

The production of shields is not simple. Craftsmen choose suitable materials such as wood, leather, metal, etc. according to the shape and purpose of the shield. For round shields, wood is usually used as the main frame, and then a layer of leather or metal is covered on the surface to increase its strength and protection. Square shields may use a metal frame and fill the inside with wood or other materials to make it stronger. Various patterns and signs are also drawn on the surface of the shield to distinguish different troops and camps.

The craftsmen were busy at their respective posts, some were cutting leather, some were sewing armor, and some were decorating shields. Their craftsmanship was superb, and each piece of armor was made with great precision.

Yi Huawei picked up a piece of armor and observed it carefully. He found that the joints of the armor were tight and seamless, the material was solid, and it could effectively protect the soldier's body.

Finally, they came to the sixth workshop, which was a chariot workshop. Huge chariots were lined up in a spacious field, which was magnificent. The chariot body was made of solid wood and covered with thick metal armor. The wheels were huge and solid, and could travel on all kinds of terrain. The chariots were equipped with various weapons, such as bows and crossbows, spears, etc., which were powerful weapons on the battlefield.

The manufacturing process of the chariot is even more refined. The craftsmen first select high-quality wood, dry and process it to make it have sufficient strength and toughness. Then, according to the design drawings, the wood is cut and spliced ​​into the body frame of the chariot. Metal armor is installed on the surface of the body, fixed by rivets, welding, etc. to ensure the firmness of the armor. The wheels are made of solid wood and metal, and after fine processing and assembly, they are flexible in rotation and have strong load-bearing capacity. The installation of weapons on the chariot also requires precise measurement and debugging to ensure that they can exert their maximum power in battle.

The craftsmen are making the final adjustments and decorations to the chariot. They are carefully checking every component to ensure that the chariot's performance is at its best.

Yi Huawei boarded a chariot and felt its majesty and power. It was as if he saw the chariots of the Qin army on the battlefield charging like a steel torrent, invincible.

After visiting the Ordnance Manufacturing Department, Xi respectfully led the way in front, slightly sideways, and indicated the direction for Yi Huawei.

The two men walked through a narrow passage. On the walls on both sides of the passage were hung some ancient weapons maps, which showed all kinds of strange weapons.

At the end of the passage, an ancient wooden door stood quietly. I gently pushed the door open, and the hinges made a slight creak.

When Yi Huawei stepped into the room, he was greeted by an old atmosphere. The room was not big, but it was arranged simply and orderly. An old wooden table was placed in the middle of the room, on which were some documents and drawings. Next to the wooden table, there was a simple bookshelf filled with various books and manuscripts.

Yi Huawei walked to the wooden table, gently picked up a newly compiled document and read it carefully. The document recorded some technical details and management regulations of Qin's weapon manufacturing, with neat handwriting and clear strokes.

"good!"

Yi Huawei looked at it for a while, then put down the document, praised the craftsmen, and announced that each craftsman would receive a salary increase of 200 yuan. He then proposed that Yilan come to help forge the fine iron in a few days.

After thanking her, Yilan was looking forward to her arrival. After all, although Yilan was a woman, she was well-known in Daqin and was called the "God of Craftsmanship" by the world.

Yi Huawei then ordered Qi to select 300 young craftsmen to wait for orders and prepare to develop new weapons.

The first batch of saltpeter refined in Laojun Mountain in Shu County is already on the way and will arrive in a few days. Those who went to the volcano to collect sulfur stones are also on their way back.

It seems that the first firecracker of Daqin will explode soon.

(End of this chapter)