Two days later, Zheng Xianli rushed to find Qin Jin.

"Good news, the iron pipe is ready!"

Qin Jin did not mention the name of the thing painted in the drawings, and the craftsmen privately called this kind of thing an iron pipe, and Zheng Xianli naturally followed suit.

"Great! Let's go, go to the Ordnance Warden!"

After only a few steps, Qin Jin's pace slowed down again, and he thought for a while before saying:

"There is a loud noise in this thing, it is not suitable to test it in Chang'an City, you take someone to pull it outside the southern city. ”

Zheng Xianli wondered:

"Is there a loud noise? Could it be that it can still alarm the saint who lives in the south?"

Qin Jin snorted, "It's hard to say how loud it is, it's hard to say now, it's always necessary to think carefully, don't catch the blind again when it's time to go!"

"General Zhonglang is very worried, but if the things of the ordnance supervisor want to go out of the city, they must have the words of the military department, and with the current efficiency of the military department, I am afraid that it will take at least seven days to go back and forth. ”

Qin Jin snorted, but this was something he hadn't expected, and he couldn't help but raise his hand and rub his temples to relieve the swelling of his head.

"In this way, it has become a problem to even pull it to the Forbidden Garden for a test launch!"

Zheng Xianli suddenly slapped his thigh.

"Yes, according to the knowledge of the next walk, although the southwest generation in Chang'an City, although there are neighborhoods, it has been uninhabited for many years, and now it is still a large wasteland, and the radius is always up and down for several miles, I don't know if it is enough?"

Qin Jin sighed.

"Whether the space is enough or not, that's the only way, but I can't imagine that there is still abandoned land in Chang'an City!"

In his impression, the center of the country at the foot of the Son of Heaven should be a place where every inch of land is valuable, and it stands to reason that it should be overcrowded.

While the two walked quickly, Zheng Xianli explained:

"Zhonglang will not know, Chang'an has a population of nearly one million, and the supply of grain output in Guanzhong has been stretched, so in the early years of Tianbao, the Son of Heaven ordered to stop the move from all over the country, but the eastern capital Luoyang occupied the convenience of Heluo transportation, and there was Hanjiacang, which was built with the strength of the whole country, and the population moved to the eastern capital. It is said that Chang'an is the first city of the Tang Dynasty, if there is no thief rebellion, maybe in a few years, this name will be taken off by Luoyang!"

Qin Jin was very worried, and he talked with Zheng Xianli without a match, and it took a whole morning to arrange for the carriage and horse to transport the artillery to the south of the city. In order not to attract attention, he also specially arranged for someone to cover it with tarpaulin, and if anyone asked, he said that it was to transport iron.

The wasteland in the south of the city is far more open than Qin Jin imagined, and several large cars can be stopped, and some soldiers will remove the tarpaulins on the cars one by one.

But on the cart, three iron pipes surrounded by one person were black and shiny, and there were three yellow, orange and orange pipes in addition to the time, which could also be surrounded by one person. Qin Jin was amazed, the old craftsman was also delicate, knowing that this thing would have to be tested several times, and he actually built three copper cannons and three iron cannons in a row.

Next to the six barrels, there was also a wooden box, which had no lid, and it could be clearly seen that it contained seven or eight lead balls the size of two fists.

In fact, this thing is far from the artillery that Qin Jin is familiar with, and although the workmanship is not rough, it is a little strange in shape.

It took a lot of effort for the soldiers to put the six cannon barrels weighing more than 1,000 catties on the earthen platform dug in advance.

On one of the big cars, there was also the black powder that Qin Jin had made in a hurry, and before that, he had tested it dozens of times, and the gunpowder after granulation made him very satisfied with the effects in all aspects.

From charging to stuffing the lead ball, Qin Jin did it himself, and after installing the fuse, he drove everyone behind the mound more than ten steps away.

A soldier handed over the lighted torch, and Qin Jin carefully put the torch towards the fuse, and with a sizzling sound, the fuse sparkled everywhere. Seeing that it was lit, he immediately threw away the torch and quickly ran to the ridge more than ten steps away behind him.

After only running a few steps, Qin Jin felt the ground shake, and then his ears buzzed, and the whole person lost his balance and jumped to the ground.

Including Zheng Xianli, the old craftsman and others, who had ever heard such a loud noise, even the thunder in the thunderstorm season was 108,000 miles weaker than this.

After a while, Qin Jin got up from the ground in embarrassment, and didn't care about dusting off the dust on his body, so he went to check the test firing of the artillery. However, the scene in front of him made his heart suddenly cold in half.

But seeing that the iron cannon barrel on the earthen platform had been blown into several pieces from the roots, and his nose was filled with the smell of burning gunpowder, Qin Jin's mouth was filled with bitterness.

Maybe it was too much gunpowder, which led to the boring.

Soon, Qin Jin adjusted his mood and cheered up to test again. He reduced the charge by almost half and, having made all preparations, lit the fuse again.

This time he ran much more calmly, and before the cannon fired, he had already hidden behind the mound.

With the earth-shattering sound of shaking the mountains for a while, the old craftsman ran up to check one step ahead of Qin Jin, Qin Jin followed behind and saw him before and after he arrived at the earthen platform, his footsteps staggered for a while, and he knew that it was not good, and when he walked in, he saw that the iron cannon was boring again.

"This, this ......"

The old craftsman's expression was sad, as if he was not looking at a few pieces of broken copper and iron. Although he had already stated to Qin Jin in advance that the things he had created might not be helpful, he still couldn't help but be sad when it came to the end.

Zheng Xianli was also behind Qin Jin, shook his head again and again, and comforted: "Fortunately, the iron can be used again after it is melted, and it will not be wasted, but it just took a little more effort." ”

Qin Jin gritted his teeth and reduced the charge again, and the iron cannon finally did not blow up and bored again, but the effect was unsatisfactory, and the lead ball only shot more than twenty steps away from the muzzle.

In ancient times, one step was equivalent to one and a half meters in later generations, and more than 20 steps were not even 50 meters. Obviously, this is a waste that comes in handy. At a distance of fifty meters, the enemy soldiers have already rushed to the front of the formation in the blink of an eye, what is the use of this kind of artillery?

The old craftsman's voice was slightly dry.

"There are also three copper pipes, and Zhonglang will want to give them a try. So far, I can only try the remaining three copper cannon tubes."

As a result, three of them were test-fired, and one of them was still boring, and the remaining two were not boring, but the range was only more than 30 steps.

After days of hard work, the things that were created were so unbearable.

Qin Jin asked the old blacksmith if there was a way to strengthen the cannon body.

After the old craftsman looked at the fragments of the fried boring, he replied gloomily: "There is still a problem with the manufacturing process of the iron pipe, after the molten iron is cast, a large number of bubbles of different sizes are produced on the pipe wall, and the reason for the explosion may be due to this." ”

"So, what about the brass pipes?"

Qin Jin picked up a few pieces of iron cannons, and then picked up a few pieces of copper cannons. I saw that there were many clearly visible bubbles on the section of the iron fragments. But the cross-section of the copper block is very solid.

I only listened to the old craftsman's voice and hesitated.

"It's really strange, I have half a lifetime of experience in smelting bronze, and this color is already the best product, but it has also exploded. If you want to reinforce, I am afraid that you can only thicken the pipe wall. ”

Qin Jin's originally fiery heart suddenly cooled completely. This kind of copper cannon is more than 1,000 catties. If the pipe wall is thickened, the weight reaches more than 2,000 catties, or even more than 3,000 catties, whether this kind of thing still has any effect, it is really difficult to say.

However, failure is failure, after all, Qin Jin knows that there is no problem with the idea of making artillery. There should be two problems with them, one is that the process of manufacturing the cannon body is not up to standard, and the other is that the quality of the iron itself is low, such as too many impurities.

It's a pity that Qin Jin doesn't know anything about ironmaking, and in this regard, he is more than 108,000 miles behind the old craftsmen, if he wants to make any improvements in these links, he can only rely entirely on the craftsmen of the Ordnance Supervisor, and it can also be said that he can only fully trust the craftsmen of these Ordnance Supervisors, who have the ability and intelligence to solve the problem of failing to pass the process.

Qin Jin believed that the wisdom of the ancient Chinese people was no worse than that of modern people, all they needed was time, maybe after a year or two of trial and error, they would definitely build a useful artillery, but he could not afford to wait.

Taking advantage of the prosperity and defeat, Qin Jin led dozens of armor soldiers to leave the wasteland in the south of the city and returned to the station of the Shenwu Army in the Forbidden Garden in the north of the city.

At the same time that Qin and Jin were developing artillery, Yang Guozhong was also in full swing formulating various rules for the martial arts exercise three days later. The Son of Heaven named Yang Guozhong to be in charge of this martial arts exercise, which is equivalent to responding to his wishes.

Du Qianyun stood respectfully beside Yang Guozhong, quietly listening to him talking.

"I have an excellent idea this time, I can divide the four groups of men and horses of the right leading guard, the Shenwu army, the dragon martial army, and the left Wuwei into two parts, pretending to be the Tang army and the rebel army respectively, and do a field exercise on the ground of dozens of hectares in the forbidden garden, and the saint will definitely be satisfied when he sees it......"

Du Qianyun was amazed by Yang Guozhong's imagination, this kind of method, he couldn't think of it even if he broke his head. But if you think about it carefully, it's really ingenious in this way, and if you are a child today, you may really like this tune.

Peeked at the radiant Yang Guozhong again, Du Qianyun sighed secretly, the one who knows the Son of Heaven is really none other than Yang Xianggong. Yang Guozhong only flattered the Son of Heaven when he burst out with amazing imagination.

"Xiang Gong Tao is strategic, far better than Bai Qi and Xiang Yu, go down and admire, admire it!"

Yang Guozhong's eyes swept to Du Qianyun, and said with a smile: "Bai Qi, Xiang Yu, it's better to ask yourself, but this method of playing martial arts and watching soldiers, I'm afraid that only Yang can think of it in the world!"

The color of pride is beyond words.

While Du Qianyun patted his ass, he also secretly agreed with Yang Guozhong's statement, indeed, this method of pretending to be a rebel all the way and pretending to be a thief of the Tang army all the way, only Yang Guozhong could think of it.

Thinking of this, Du Qianyun couldn't help but tremble in his heart, could it be that Yang Guozhong intended to arrange for the Shenwu Army to pretend to be a rebel?

As soon as this idea jumped out, Du Qianyun could be 100% sure that Yang Guozhong must have planned to kill two birds with one stone, let Qin Jin mix as a rebel, and beat the Shenwu Army in front of the Son of Heaven. From now on, Qin Jin will inevitably lose his position among the Son of Heaven!