Yang Fan stared closely at the blast furnace, watching the craftsmen constantly stirring the molten iron. Success or failure depended on this.

Fu Laoliu stared at the color of molten iron at the furnace mouth with his eyes widened.

"Intensify the blast," he yelled from below.

Twenty apprentices were shirtless, wearing only loincloths, with muscles all over their bodies, working hard to push the rectangular bellows.

Shouting the trumpet and pushing the bellows.

"Hey, ho. Hey, ho."

"Work harder! Hey, ho"

"Go forward! Hey, ho"

Leader: Just bend down and push it up

Together: Hey, roar - Hey, roar

Collar: Stand up with the palm of your hand

Together: Hey, roar - Hey, roar

Leader: Be careful where you step

Together: Hey, roar - Hey, roar

Collar: Move your waist back

Together: Hey, roar - Hey, roar

Fu Laoliu saw that the firepower at the furnace mouth was not enough. Based on the experience of an old craftsman, he found that if the phosphorus mentioned by the master was removed, the melting temperature of the molten iron would increase, making it difficult to smelt.

If we had followed the previous method, we would have been able to produce molten iron a long time ago, but now the slag the master mentioned has not been produced yet.

This is not difficult for the old craftsman Fu Laoliu. If the temperature is not enough, then increase the blast.

He yelled: "You haven't even eaten yet, work harder. Give me all the strength you need to support your mother-in-law."

As Fu Laoliu cursed, the style of the chant also changed.

Collar: Why are you bending over?

Together: Hey yo - Hey yo - Hey yo

Collar: Grab the pigtails

Together: Hey yo - Hey yo - Hey yo

Leader: It’s really beautiful.

Together: Hey yo - Hey yo - Hey yo

Leader: Don’t be greedy

Together: Hey yo - Hey yo - Hey yo

Leader: Where to stand in the wind?

Together: Hey yo - Hey yo - Hey yo

Leader: He is a good man

Together: Hey yo - Hey yo - Hey yo

Leader: Who can’t move?

Together: Hey yo - Hey yo - Hey yo

Leader: Which one is the most fucked up?

Together: Hey yo - Hey yo - Hey yo

As the blast intensified, the furnace mouth immediately began to churn.

Pieces of black debris floated up, and Yang Fan stood on the wooden shelf and watched. It felt a bit like foam from hot pot.

If the blood is not drained cleanly when a sheep is killed, foam will appear on the meat slices when cooked.

The same goes for iron ore, which contains high impurities and produces a large amount of slag.

"Brothers, there's something wrong!" the old craftsman Bai Laosan shouted loudly.

All the craftsmen were excited.

The master is truly a god.

There are indeed these pickled things in the molten iron.

No wonder the previous iron barrels always exploded.

"Remove the slag!" Fu Laoliu shouted.

The craftsmen immediately used shovels to push the slag toward the slag outlet.

As the slag continues to float, it is continuously removed.

Until there is no more slag.

"Master, we can produce molten iron now," Fu Laoliu shouted loudly.

"Tap out the molten iron" Yang Fan shouted the order.

Pig iron is hard and brittle and can only be cast, not forged.

In order to forge, mature iron must be smelted again.

Fatty Wu specifically explained that the gun barrel cast by Yang Fan had sufficient hardness and strength, but lacked toughness and could not be charged too much. If it was loaded like a blunderbuss, it would still explode.

The fire gate gun is the fire gate gun. It has a small charge and a short range. It has now been eliminated by the matchlock gun. Yang Fan did not dare to equip bird guns on a large scale, and he was short of time, so he could only use this hopeless method.

The effective range of the fire door gun is only 356 meters, the effective range of the bird gun is at least 80 meters, and 150 meters is still lethal to people without armor. Of course, the premise is that you can still shoot at such a long distance.

If hit.

Fatty Wu just helped Yang Fan realize the single-barreled fire door gun.

And he talked about the shortcomings of the fire door gun in detail. If it is actually used, it should not be loaded with more than five rounds. The front ammunition is too close to the muzzle, the bullet travel is too short, and the gunpowder is not fully burned. The lethality of the shot is insufficient.

At a distance of thirty-five meters, when facing a cavalry charge, the time to shoot is very precious. Being able to fire five shots is already very good.

After all, it has no lethality and wastes more shots than it is worth.

Molten iron begins to pour into the mold.

Soon the five molds were burned red.

After waiting for a while, the barrel was formed.

Fu Laoliu began to instruct the apprentices to dismantle the mold.

Clamp the red barrel with iron pliers and throw it into the oil tank.

With a bang, the oil tank boiled and then burst into flames.

Here the mold starts the next round of casting.

By nightfall, a large number of gun barrels had been recast.

When Yang Fan held this newly cast gun barrel, there should be very few bubbles and cracks.

According to the data given by Fatty Wu, re-weigh the gunpowder and prepare to start the test firing.

One round was loaded and tested successfully.

Two rounds of loaded ammunition were tested and fired successfully.

Three rounds of loaded ammunition were tested and fired successfully.

Yang Fan breathed a sigh of relief. Last time, the chamber exploded after three rounds.

Five rounds of loaded ammunition were tested and fired successfully.

Seven rounds of loaded ammunition were tested and fired successfully.

Nine rounds of loaded ammunition were tested and fired successfully.

Yang Fan was overjoyed. This showed that the nine-section repeater gun was successful. It did not ignite the gunpowder behind it. They were all fired in sequence. That is, the power of the first shot was smaller, and the power of the later shots was getting stronger. It was exactly the opposite of the enemy getting closer and closer on the battlefield.

.

Then began a destructive experiment, which was to increase the single-shot charge little by little to see how many times it would explode. This data will become the safe use standard for this product from now on.

Double the charge, single bullet firing, safe.

Triple, launch, safe.

Quadruple, launch, safe.

Five times, it explodes.

Subsequently, the experiment continued with fifty barrels.

Finally draw a conclusion.
To be continued...