In addition, it is easier to process the bronze products after they are cast.

Because although bronze is softer than iron, its toughness is much stronger than ordinary cast iron.

Finally, bronze materials have self-lubricating properties and ductility.

Compared with the barrel cabins cast by steel, especially those cast by the Jin Dynasty that were uneven and rough, it is less likely to explode when firing.

The inner diameter of the bronze cannon in front of me is about eight centimeters, and it can almost barely be stuffed into a man's fist.

The thickness of its barrel is getting thinner and thinner from the back to the front, and the wall thickness is about four to two centimeters.

Song Wuhui touched the inner chamber with his hand, and the surface was polished very smoothly. It must have been a rotation boring and grinding tool created by a teacher in a military weapon supervision, such as a turning arrow machine.

This thing fell into Song Wuhui's eyes, but it was actually a very valuable piece of information.

From this point of view, his undercover Da Song this time is worth it! Because this kind of firearm actually represents the weapon technology of Da Song, it has made a qualitative leap! You should know that the main power of cannons like this is in range.

In order to increase the range, the Jin Dynasty and the Song Dynasty took two different routes.

In order to make the Fire Dragon Cannons more accurately and farther, the Jin people only knew to increase the length of the cannon barrel, but the total length of the Fire Dragon Cannon exceeded one meter. Such weapons will become extremely troublesome whether they are carried or loaded.

Moreover, the safety of the Fire Dragon Cannon is extremely worrying when used, and it will explode for you to see it at any time.

However, the Song Dynasty obviously took another route of firearm development. They did not lengthen the length of the gun barrel, but gave it greater pressure by using flexible bronze raw materials and increasing the thickness of the gun barrel wall! So when Song Wuhui saw this bronze cannon, his first reaction was that the gunpowder technology of the Song Dynasty must have been greatly improved.

Because if this kind of artillery uses old-style gunpowder, the shells will fly out before the chamber pressure reaches its highest value.

This will cause the flame and sound and light effects of the muzzle to be extremely fierce, but the thrust is wasted too much outside the barrel.

So this kind of artillery is likely to be used to quickly burn gunpowder!... When Song Wuhui thought of this, he said to Zheng Qingzhi outside the prison without hesitation: "Take the gunpowder and cannons used in this artillery to show me!"

As soon as he saw that Song Yulin finally became interested in this cannon, Zheng Qingzhi also smiled and asked the servants to bring two bags.

First of all, there was the first bag. Song Yulin reached out and grabbed the things inside.

When he pulled out his hand, Song Wuhui covered up the shock in his heart as much as possible, and there was no look of surprise on his face.

But his heart was already overturned! Sure enough, the hand he was holding was a piece of gunpowder! Song Wuhui glanced at the gunpowder and saw that it was dark gray on it, and there were still light shining with stars - this was the reflection caused by a sufficient amount of saltpeter powder.

The particles of these gunpowder are uniform in size, with clear edges and dim colors... Song Wuhui finally breathed a sigh of relief when he saw this.

It seems that although the Song Dynasty mastered the granulated gunpowder technology, it did not grind the edges and corners of the granulated gunpowder.

This process requires the use of trace amounts of graphite powder and gunpowder to be placed together and rotated and polished in the drum.

In other words, the craftsmen of the Song Dynasty were still missing the last process.

But even so, the power of these granular gunpowder must be far more than ordinary old-fashioned gunpowder! You must know the value of granular gunpowder, which can be called the ultimate use of black gunpowder in military terms.

There are many benefits to granulation of gunpowder. The first is that although ordinary black gunpowder is stirred very evenly when used, the weight of charcoal and saltpeter inside is inconsistent.

Therefore, during transportation, continuous vibration of the gunpowder will cause the heavier saltpeter to slowly sink to the bottom of the barrel, so that the charcoal powder will be left on the top.

After this situation occurs, it will be difficult for soldiers to control the power of gunpowder.

Even the power of the bottom of the barrel and the top layer of gunpowder are three times that of the difference.

Therefore, after making gunpowder into particles, there will never be any problem of saltpeter settlement.

The second one is that after the particle gunpowder is loaded into the gun, there are tiny gaps in their particles, which makes the flame conduction extremely rapidly when it burns.

Particulate gunpowder can make the gunpowder in the gunbore burn, almost at the same time, each particle burns out quickly, thus exploding all its strength.

Unlike the black gunpowder like flour, the flames are gradually transmitted and burning.

The difference between the two is the difference between the power of gunpowder being released to the maximum extent in an instant and the slow and gradual (relative) release.

So these granular gunpowder are the direct reason why the bronze cannon of the Song Dynasty can make the barrel so short! Such bronze cannons plus granular black gunpowder... the power of this cannon is so powerful! When she thought of this, Song Wuhui reached out to another bag again.

He grabbed a round iron ball in the bag.

These iron balls are extremely smooth, each of which is about the size of a peanut (peanuts have been passed from America).

This cannon was still shot! Song Wuhui thought to himself: "If a cannon with an eight-centimeter diameter is used to attack the city wall, it may be quite insufficient if it is used to attack the city wall.

However, when hitting the city gate, you can use dense artillery shooting and gradually break the city gate with a large fist shell.

This time the other party did not take out the round shells, but only showed him the shotgun, which was obviously a move for him.

...In the bag containing shells in front of Song Wuhui, there is also a bamboo tube.

He took it out and saw that the outside of the bamboo tube was turned around, so that the caliber could be inserted into the barrel.

This bamboo tube is about half a foot long, and there should be about 200 shotguns installed inside.

It seems that when the artillery is fired, the gunner can load the bamboo tube filled with iron balls directly into the gun chamber, and then fire the gun and fire it out.

In terms of shotgun containers, Tongzhou artillery uses pulp cups... but this bamboo tube can definitely be used as a makeshift.

Song Wuhui twisted an iron ball in his hand and said thoughtfully: "The cannon of Tongzhou soldiers is bigger than this one! How far can you hit this projectile?"

When Song Wuhui asked this question, he had already estimated the shooting distance of the cannon.

According to the level of its launch medicine and the level of airtightness of the artillery.
Chapter completed!