By the time the gunner had done all this, the time had already passed.

In this case, this artillery shot was enough for the cavalry to advance a hundred feet.

In other words, this artillery will shoot at most three shots, and the cavalry should be close to the face.

So if this kind of cannon is taken to defend the city, it is really good, anyway, it is difficult for the cavalry to directly fight on the city wall.

But the words of the field battle will not work, if the cavalry is put in the face, it is equivalent to losing.

The most important thing is that this kind of cannon is too cumbersome, and when facing the cavalry, it is not easy for them to turn the head of the cannon in case the cavalry uses a big roundabout tactic.

After everything was ready, the gunner looked at Sun Yuanhua, and Sun Yuanhua took a fancy to Xu Guangqi.

"Let's fight!"

The gunner took a torch and set the fire rope on the cannon on fire.

All of them left, standing outside a certain range of the artillery.

Sun Yuanhua and Xu Guangqi also hurriedly brought a bunch of cotton and stuffed Duoduo.

"Bang".

The artillery fired out.

An iron cannonball flew out at a speed visible to the naked eye.

Sun Yuanhua quickly felt that there was something a little different.

His eyes widened.

This cannonball seemed to fly higher and farther than the previous cannon.

Sun Yuanhua was extremely shocked in his heart.

Could it be that this emperor was really able to meet Emperor Taizu?

Could it be that Emperor Taizu really knew how to make gunpowder?

If he is loyal to His Majesty as a dog, then after he dies, for His Majesty's sake, will Emperor Taizu let himself cheat the corpse?

Sun Yuanhua was silent.

He actually began to calculate how successful it would be.

Sun Yuanhua is also an old technician who makes cannons and gunpowder.

He saw this scene, and he didn't know whether the gunpowder was good or bad.

The green tendons on his forehead were full of hair, and his mouth was grinning enough to see the gums.

"Someone, hurry up and send someone to measure the landing point of the cannonball, and see how far the cannonball has fallen!"

Subsequently, Xu Guangqi disliked that it was too slow for these gunners to find it.

He turned his face again and looked at his attendants.

"You go and look for it with you."

The entourage around you look at me, I look at you, and they all refuse to leave.

Xu Zhi, the leader of the entourage, was still a little worried on his face.

After all, Xu Guangqi is a cabinet scholar, and he can't make the slightest mistake, so how can there be no one around to protect his safety.

"Master, if we go now, who is here to protect your safety?"

Xu Guangqi was furious when he heard this.

This is still at the foot of the Son of Heaven, and the arsenal is under the protection of Jinyi Guard. ”

"How could there be any bad guys coming here, I don't need your guards here."

"It's the right thing for you to get me the iron cannonballs."

What happened to the feet of the Son of Heaven?

The feet of the Son of Heaven are the most chaotic.

It's just that Xu Zhi saw Xu Guangqi so insisting, so they couldn't insist anymore.

Xu Guangqi and Sun Yuanhua's entourage, plus the artillery testers, all went to search for the iron cannonball.

Xu Guangqi's excited expression fell into Sun Yuanhua's eyes.

He had never seen his teacher so excited.

Xu Guangqi quickly saw his disciple's expression, and his face turned red on the spot.

He was still despising the gunpowder formula that the Son of Heaven took out just now, thinking that no matter how powerful it was, it would not be much better.

Now it seems that it is a bit of a slap in the face on the spot.

Xu Guangqi felt that he had to say something to save his dignity.

"In the past, the old man didn't believe that His Majesty saw Emperor Taizu, but now it seems that the old man is short-sighted."

"With the blessing of my ancestors, I will be able to defeat Jiannu and revive the mountains and rivers."

The iron cannonballs of this era are really not easy to find.

Sun Yuanhua and Xu Guangqi really didn't have many entourages.

After a long time, none of the retinues had returned.

Xu Guangqi was already a little anxious.

He stood up and paced back and forth a few steps, then sat down with some reluctance.

In fact, Xu Guangqi was too anxious.

Even if it is an ordinary cannonball, it can shoot three miles away.

That's six miles back and forth.

Just running back and forth, that time is not short.

Not to mention, they still have to continue the search for iron shells.

Now that only a quarter of an hour has passed, he is already in such a hurry, it really makes a little unreasonable.

But it is also not allowed for Xu Guangqi not to be in a hurry, the situation in the north is very bad now, and the farther this artillery fires, it means that they have more advantages in the face of the Jiannu cavalry.

If this artillery can really help them increase their range by one-half, as Zhu Youxiao said, it will also be very remarkable.

In the past, when facing the Jiannu cavalry, they could only fire three shells, but now they can even fire five shells.

This discrepancy is a nightmare for cavalry.

Sun Yuanhua was actually very excited, this thing was created by him.

If it really succeeds, it can be regarded as a credit to them.

An hour later, the retinue and gunner finally returned.

"Master, we've finished counting."

"The first landing point of that shell, according to our measurements, was four miles and one hundred and twenty feet."

Xu Guangqi's heart was flooded with waves, and it was really almost five miles?

The range of this gunpowder cannonball is really half that of the traditional black fire!

Xu Guangqi couldn't wait to pick up the maroon gunpowder, put it under his nose and sniffed it.

Even though there was a burst of sulfur smell from the gunpowder, Xu Guangqi seemed to smell the most wonderful thing in the world.

Although he has been slapped in the face, he is willing to be beaten in this face.

Xu Guangqi suddenly twisted his head back.

"Sun Shilang, pass the order, set this maroon gunpowder as the highest secret, and no one is allowed to pass it on."

"Even if the Ministry of Industry sends someone to ask for it, it must not be given."

"If you let the old man know who leaked the formula of this gunpowder, the old man will ask for his head."

Sun Yuanhua's face was stunned.

"Rest assured, the students will do it properly."

Xu Guangqi patted Sun Yuanhua on the shoulder, he was very satisfied with this student.

"Let's follow Your Majesty!"

"It seems that Your Majesty really got the oracle of Emperor Taizu, at least the formula of this gunpowder can't be faked."

"No matter how bad it is, or you can cheat the corpse after death!"

Sun Yuanhua nodded, thinking that it made sense.

"Teacher, isn't that a breech-loading gun that also has a big deal?"

Xu Guangqi's face darkened.

"That's another story."

Although he already agreed with this maroon gunpowder in his heart, he still didn't have half trust in the rear-loading gun.

Breech-loading guns may have a faster rate of fire, and perhaps the problem of air tightness will be solved later.

But it's definitely not that, as simple as a pin bolt can solve.

ps: In ancient China, there was such a unit.

According to Mr. Wu Hui's "Concise General History of Chinese Weights and Measures", it is stated that before the Tang Dynasty, six feet were steps, three hundred steps were one mile, and one mile was 1,800 feet;

At the beginning of the Tang Dynasty, five feet was a step, three hundred and sixty steps were a mile, and one mile was still 1,800 feet.

The official rulers used in successive dynasties are different, and the specific length of a mile is also different, but they are all around 500 meters.

But in general, the ancient ones are similar to the ones they are now.