Li Jiaji, Li Siyuan's home, a family of four was eating breakfast, Li Sisi sat next to her husband and asked curiously: "Xianggong, what were you busy with all night yesterday?" ”

Knowing that it was not only his wife who was worried about him, but also his parents, Li Siyuan briefly explained a few words while eating: "Isn't it, yesterday His Majesty came to me to discuss matters and arranged a task for me to invent a weapon that can attack the city and kill people miles away!" I pondered all night, and finally got the drawings out!"

Li Sisi and Li's mother are both women after all, after hearing this, they all looked at Li Siyuan with admiration, but Li's father is different, these years, he has followed the * south and north wars, he has seen all kinds of weapons, the effective killing distance can reach 800 meters, and there are only eight bull crossbows, and they are all used to defend the city, and they are rarely used to attack the city!

Li Sande couldn't help frowning when he thought of this: "Your Majesty, this is really embarrassing!" But listen to the meaning of your words, you have already invented it? This thing is no joke, this is a major event that can kill the head or kill the whole door! ”

"Father, don't worry!" Li Siyuan said while taking the rice into his mouth: "This weapon I invented can effectively kill and injure the enemy from a distance of four kilometers, as for the city wall, in front of my weapon, it is just some chickens and dogs!" ”

Seeing his son's confident appearance, Li Sande felt a lot more steady: "You just blow it, just don't slap your face when the time comes!" Let's eat, when you're done, what should you do! ”

Li Sande didn't know if his son was bragging, but when he saw his son rushing to the iron mine and the government's * workshop after eating in a hurry, he had already guessed that this weapon was inextricably linked to these two things!

Presumably everyone knows that the original barrels were made of brass or bronze, and a small part was made of cast iron, but the disadvantages of both are obvious, whether it is a brass cannon or a bronze cannon The cost is very expensive, you must know that copper money is the most widely used currency in the old society, and using copper to make a cannon is tantamount to directly using money to make a cannon!

On the other hand, the cast iron cannon, although the cost is much smaller than the brass cannon and the bronze cannon, but in terms of the iron-making process at that time, the cast iron cannon is easy to explode, not to mention the service life, one is not to hurt others, first hurt yourself!

Li Siyuan didn't want to make these two kinds of cannons, he wanted to see if he could directly make steel cannons, so that both the cost and the service life could be greatly improved!

Coming to the mine to take a look, Li Siyuan shook his head helplessly, relying entirely on manpower and animal power to mine ore, and the speed is naturally not able to meet his requirements!

Then he came to the ironmaking plant again, watched the molten iron of a furnace poured down, and then looked at the iron ingots behind, Li Siyuan still sighed helplessly, although the fineness and steeling rate of iron have been greatly improved compared with before, but it is still in short supply!

Helpless, he looked at the helpless scene in front of him, and could only make a helpless choice, steel cannons should be produced, and cast iron cannons should also be produced! At the same time, it is also necessary to improve the fineness of the iron, try to prolong the service life of the cast iron ladle, and reduce the probability of the cast iron cannon exploding!

The problem of the cannon has been decided, and the next thing is the problem of the cannonball, for this problem, Li Siyuan is also a little clueless, after all, he is not omniscient, so he had to throw this problem to some masters, let them study it slowly, but he is not without contribution, he pointed out two directions to them, one is a solid bullet, and the other is *!

Solid bullet is simple, as long as the surface is polished smooth according to the size, the difficulty is on the top, whether it is from the fuse and the filling of the *, it is extremely difficult for people in this era!

In the Taiji Palace, Li Shimin and Cheng Yanjin were shocked by these peerless weapons, although they were a little skeptical, but Li Shimin still did not withstand the temptation, waved his hand, and issued several holy decrees, asking all yamen to fully cooperate with Li Siyuan, that is really asking for money for money, things for things, and people for people!

The holy decree to Li Siyuan was simple, but Li Siyuan also felt Li Shimin's urgency, and also saw the consequences if he failed to complete this task: "Aiqing, you must dedicate this thing to me as soon as possible!" Remember! Remember! ”

In just one sentence, the pressure on Li Siyuan was much greater than that of any previous holy decree!

Li Siyuan, who was still full of confidence, couldn't help but doubt the correctness of his decision at this time, but if he said it, it was the water that was spilled, and there was no door to take it back! The path you choose has to be completed on your knees!

Whether it is the manufacture of cannon bodies or shells, it is an extremely confidential matter, Li Siyuan does not dare to hire people to make it privately, so he can only draw people from various yamen of the imperial court to be foolproof!

Since the day the holy decree was issued, Li Siyuan has gone home less and less, but he has been staying in the secret workshop of the imperial court for more and more time, not because he doesn't want to go home, but because as time goes by, all kinds of problems have arisen whether it is knowing the cannon body or the shell!

There are more and more problems such as exploding, deformation, shell size, sealing, etc., and Li Siyuan can only stay in the workshop all the time, study and improve with the workers and masters!

"Boom" with a loud sound, in this secret experimental site, a black cast iron cannon stood in the field, the muzzle of the cannon was still emitting green smoke, the rider in the distance was waving the flag to report the situation, and after a while, a clerk ran to the front and said: "Master Hou hit 1800 meters away this time!" The big iron egg smashed on the ground and rolled out for hundreds of meters, if this hit a person, tsk, I can't even think of it! ”

"Have you checked all the guns?"

"It's been checked, it's already the tenth shell, and the barrel is still intact, without the slightest change!"

"It's barely qualified!" Li Siyuan nodded lightly: "Let's produce it according to the production process of this cannon first, and give some rewards to the maker of this cannon, don't slack off!" ”

The clerk nodded and retreated, and Li Siyuan also secretly breathed a sigh of relief, after nearly a month of suffering, he finally saw some preliminary results, and he was finally able to give His Majesty an explanation, so he couldn't help but be unhappy!

At present, as long as the problem of flowering eggs is solved, then it is really done, but the filling problem has been solved, and the fuse has not been solved for a long time, which is really sad Li Siyuan!