After making the first bronze hammer, Jiang Xuan first smelted a large pile of copper ore and tin ore twice, and cast it into copper and tin blocks with Tao Fan.

Then, he first poured a short bronze knife about thirty centimeters long, and sharpened the blade very thinly on the stone.

However, when he tried the bronze short knife, there was a serious problem, that is, the cutting edge was too soft, and when he cut two knives on the tree, the blade was rolled directly.

"how so?"

Jiang Xuan held the bronze short knife and scratched his head, feeling that something must have gone wrong.

The bronze hammer made before is very easy to use, why can't the same bronze liquid be used to build a bronze knife?

Bronze can definitely be used to make weapons, he was very clear about this, because he had seen an imitation bronze knife in a previous life, and the sharpness was quite good.

"Could it be that bronze needs to be quenched like iron?"

Jiang Xuan frowned and pondered for a long time before deciding to give it a try.

He first put the bronze short knife into the stove and burned it red, then took the knife out with a wooden stick and dipped half of the blade in cold water.

"Chichichi..."

The water surface that was in contact with the bronze dagger instantly boiled, and a large amount of water vapor came out.

Then, Jiang Xuan put the short knife on the ground and let it cool down slowly.

"try again."

After the bronze dagger cooled down, Jiang Xuan picked up a branch as thick as a thumb, placed it on the ground, and cut it with the bronze dagger, trying to cut off the branch.

"Dole!"

The bronze dagger slashed on the branch, and the branch was broken, but not neatly, but because Jiang Xuan's strength was too great, the branch could not bear it and broke, and the fracture was irregular.

Jiang Xuan picked up the bronze dagger and looked at it, good guy, the blade has been rolled again.

"It seems that the method of quenching is useless for bronze."

Jiang Xuan felt a little frustrated. He sat beside the smelting furnace, looked at the bronze short knife, and the bronze hammer on the side, thinking about the key to the problem.

The two warriors also stood aside, but they didn't know anything about the new things like bronze, and they didn't dare to talk nonsense. They could only stare at the leader, hoping that the leader could come up with a solution.

Jiang Xuan sat for a while, and then looked at the smelted copper and tin blocks on the other side of the room. A flash of light suddenly flashed in his mind.

"Could it be that there is a problem with the copper-tin ratio?"

He walked over, picked up a piece of copper, a piece of tin, and tapped it. The copper was slightly harder than tin, and a small dent appeared on the tin block, but the copper block didn't change.

"Try to increase the ratio of copper!"

Jiang Xuan did what he said, and immediately opened the furnace to smelt the second bronze short knife. This time, he put three pieces of copper and one piece of tin.

In the evening, the second bronze dagger was cast.

He also spent the middle of the night grinding the edge of this short bronze knife to be thinner, making it look sharp.

The next day, he tried again with a branch.

"It took so much effort, don't let me down!"

Jiang Xuan held the bronze dagger, and as expected, chopped down the thumb-thick branch.

"Gaba..."

The branches were shortened again, but the fractures were still not neat. However, when Jiang Xuan picked up the bronze short knife to observe, he found that the cutting edge was not as rolled up as the previous knife.

"First Evolution"

"It seems that my idea is right, and the hardness has indeed improved a lot."

"Keep trying!"

Jiang Xuan took the two warriors and spent a long time trying again and again.

When the proportion of copper is low, the bronze knife will roll the blade when cutting slightly harder things, which is obviously unusable.

When the proportion of copper is too high, the bronze knife will not roll the blade, but it will directly collapse or even break, which is even more useless.

He can only change the copper-tin ratio little by little, and at the same time, increase the thickness of the blade so that it will not break so easily.

Until the tenth day, Jiang Xuan made a bronze knife again, this time, he put five pieces of copper and one piece of tin.

"It must be successful!"

Jiang Xuan held the bronze saber, took a deep breath, and then decisively chopped towards the branch.

"Katha!"

This time, the branch was cut off directly, and the fracture was very smooth.

Jiang Xuan looked at the blade of the bronze knife again, and saw that the blade was not curled or broken, and it was still intact!

"Great, finally succeeded!"

Jiang Xuan held the bronze knife and was very excited.

"Finally successful!"

"The leader is amazing!"

The two soldiers were also very happy, so many days of hard work was finally in vain.

"I'll go back first, you guys continue to practice here."

"Yes, chief."

Jiang Xuan wrapped the bronze short knife in animal skin, then left the casting workshop, crossed the river by boat, and returned to his house.

He unfolded an animal skin scroll, which recorded the process and results of his attempts for so many days.

For example, in the first line, it is written: two parts of copper and one part of tin, and a bronze hammer can be cast.

What follows is a series of failed attempts and matching.

Now, he picked up an animal writing brush and wrote on the animal skin: five parts of copper, one part of tin, and a short bronze knife can be cast.

The reason why the short sword is written instead of the bronze sword directly is because the long sword and the short sword are different.

The long knife is wider and longer, and when used, the force exerted will be very large, so some hardness must be sacrificed to enhance toughness.

Otherwise, if you cut it with one knife, the knife will be broken into two pieces. What's the use of being sharper?

Thinking of this, Jiang Xuan understands a little why most bronzes are made of swords and less knives.

Because bronze is a material, as long as the proportion of copper is increased, the hardness is sufficient and the sharpness is sufficient, but it is easy to break.

Compared with a single-edged knife, the flat diamond-shaped sword is thicker in the middle and thinner on both sides, and has a better force-bearing structure. As long as it is cast thicker, it is not so easy to break.

And, there was a question he had never thought about before.

That is the craftsman who cast bronze in the early days, probably because he discovered the shortcomings of the bronze sword, and after continuous improvement, it eventually evolved into a bronze sword.

Otherwise, why was there no such thing as a sword in the Stone Age?

Bronze knives are prone to curling or cracking, so they can be changed to double-sided blades, so that one side is cracked or curled, and the other side can be used again.

When fighting, what if the blades on both sides are rolled or broken? Then make the end pointed, and it can continue to be used to stab people.

Later, it was found that this weapon is easy to break, so the middle position was continuously thickened, and finally it became a flat diamond.

Therefore, later bronze swords, no matter the length, are thick in the middle, thin on both sides, and sharp at the end.

This question was only understood by Jiang Xuan after casting the bronze ware himself. He had never seen it elsewhere before, and it belonged to his personal speculation.

"It seems that more swords will be cast in the future."

Jiang Xuan suddenly felt a little funny. If he started to cast the sword directly according to the experience of the ancients in the previous life~www.mtlnovel.com~, would it be possible to avoid some detours?

However, if he had made the sword from the beginning, he would not have discovered the many problems of the bronze sword.

So, after trying for so long, it still pays off.

Thinking of this, Jiang Xuan picked up the animal writing brush again and wrote on the animal skin scroll: Bronze is more suitable for sword casting...

After writing, Jiang Xuan carefully looked at the bronze knife and put it away.

Bronze weapons cannot be revealed for the time being, otherwise, it will definitely attract the coveting of other tribes, and even bring disaster to the Vine tribe.

What the Vine tribe needs now are various tools made of bronze.

For example, an axe that can be chopped, a chisel, a saw, a shovel and other tools that can be used for woodworking, and a scissors for cutting animal skins.

With these bronze tools, the productivity of the Vine tribe will be greatly improved, and will soon be able to leave other tribes far behind.

"Make a pair of scissors first, you must make a pair of scissors!"

Jiang Xuan touched his long hair and the beard that had just started growing around his lips. He felt that the scissors were very important.

Cutting my hair with a stone knife was too painful, and I dared not even think about shaving.

There are many people in the Vine tribe. When the hair or beard is too long, they are directly grabbed into a handful and burned with fire, which is quite brave.

With scissors, you can use scissors to cut hair and beard, which is very convenient.

After the paint on the animal skin roll was dry, Jiang Xuan rolled it up and put it away properly.

He also put the bronze short knife in the room and did not take it out.

Then, with a happy mood, he planned to go around the Vine tribe.

After such a long time, his mind was on smelting bronze, and he had not cared about other affairs of the tribe for a long time.