found a sturdy two-wheeled vehicle, and then worked hard with Yan Lide and another master craftsman, and finally loaded the cannon weighing more than 500 catties onto the car.

At this time, Master Lu slowly walked over with two other masters holding the gunpowder iron ball. He put things in the car and complained loudly, "Oh my lord, these are really heavy!" Especially the iron ball! ”

"Stupid, don't you know how to find a few more people to help!"

"Oh, that's right! But I was so excited at the time that I forgot! ”

As he spoke, several people pushed the cart slowly into the valley. There was a clearing in the valley that stretched down the hillside to the wall on that side of the Survey.

When they came to this clearing, they saw that the grass was all over the place. As soon as the artillery was arranged, the master Zhao who was in charge of gunpowder suddenly said: "My lord, there are twenty catties of gunpowder here, if it weren't for Lao Lu saying that the power of this thing is much greater than that of a grenade, Lao Tzu wouldn't have given it to Lao Lu!" ”

Master Lu said indignantly: "Old man Zhao, you know that you have those gunpowders, if it weren't for the fact that the adults said that the gunpowder was dispensed, where would the gunpowder come from to give you the baby!" ”

Master Wang smiled at Zhang Yunwen wryly, and then said to Master Lu: "Old man Lu, since the gunpowder is made by adults, it is none of your business!" ”

"You-" Master Lu was about to get angry, but Zhang Yunwen hurriedly stopped: "Everyone, stop arguing, let's try the cannon first!" ”

The two looked at each other, snorted, turned their heads away, and no longer looked at each other, but focused all their attention on the cannon.

"Well, Lao Wang, pay attention to filling it with gunpowder, Lao Zhou, prepare to put iron balls into the barrel, Yan Yuanwai, prepare to record data!"

Everyone closed the bolt tightly according to Zhang Yunwen's instructions, and the muzzle of the cannon slowly rose, aiming at the low hills in the distance.

"Alright, a pound of gunpowder! Add a lead! ”

Wang Dajiang immediately stuffed the gunpowder bag into the barrel of the gun, and then added a lead at the end of the gun.

"Okay, compact the gunpowder and put on the iron ball!"

Wang Dajiang pressed a wooden stick with a sackcloth in the barrel for a while, and then Zhou Dajiang put an iron ball into the barrel.

"Yan Yuanwai, record it, one pound of gunpowder, two and a half pounds of iron balls!"

Yan Lide quickly picked up the brush and wrote on a piece of rice paper on a wooden board.

"Ignition!"

Master Lu picked up the fire fold and lit the lead, only to hear the sound of "swooping", and the lead was slowly shortened. Zhang Yunwen led everyone to retreat one after another, stopped outside Zhangyu, and then looked at the lead that was about to burn out.

The lead slowly disappeared into the barrel, and a puff of green smoke came out.

"Boom-" An earth-shattering voice rang out. I saw an iron ball shooting out of the barrel of the cannon at a rapid speed, and that speed, in the eyes of everyone, was just a black line.

The iron ball fell straight on the land of more than 100 zhang, bounced lightly twice, the kinetic energy disappeared, and the bones slowly slid down the hillside.

"The range is one hundred and four feet! On soft soil, bounce twice! ”

Zhang Yunwen raised the thumb of his right hand, squinted his left eye, opened his right eye and looked at the landing point of the shell through the side of his thumb, then closed his right eye and looked through his left eye.

This is a simple way to measure distance, using a right angle trigonometric function to measure. First, raise your right arm horizontally, make a fist with your right hand and give a thumbs up. Use your right eye to overlap the left side of your thumb on the target in a straight line, keep your right arm and thumb still, close your right eye, and then use your left eye to look at the left side of your thumb to see that the edge line is some distance away from the right side of the target. Estimate this distance, and then expand this distance tenfold, and the resulting distance is the distance between the current position and the target.

Hearing this data, everyone suddenly exclaimed: "Good girl, this is farther than that bed crossbow!" ”

"If this cannon hits the wall, won't it be a hole in the wall!"

"But if you hit the enemy's formation or the charging horse team, the power is not great, I'm afraid you won't be able to kill a few people!"

“……”

Listening to everyone's discussions, Zhang Yunwen said: "This is a problem with shells, and it will be improved in the future!" But for now, let's keep testing! Clean the chamber first! ”

After saying that, he opened the bolt, only to see a puff of green smoke coming out, and black ashes falling from the barrel.

After cleaning the chamber, Zhang Yunwen had several pounds of gunpowder, several pounds of gunpowder, and two pounds of gunpowder. However, when there was still a pack of two catties of gunpowder left, an obvious crack had already appeared in the barrel.

"Alas, Lao Lu, this cannon still has to be reforged. There is more rigidity, but less flexibility, and only a dozen catties of gunpowder are used, and after so many shots, the barrel of the cannon will burst! In the future, when casting cannons, metals such as tin and lead in the steel will increase the ductility of the barrel! Well, you can go back and try this method! ”

Master Lu nodded, silent, as if thinking about something.

Zhang Yunwen turned around and asked Yan Lide again, "Yan Yuanwai, has the data been recorded?" ”

Yan Lide handed a few pages of rice paper to Zhang Yunwen and looked at it, and the record was quite detailed. I saw that it read: "One pound of gunpowder, two and a half pounds of iron balls, the range is one hundred and four feet, and it bounces twice on soft soil; One and a half pounds of gunpowder, two and a half pounds of iron balls, a range of one hundred and sixty-two zhang, three times on soft soil; Two catties of gunpowder, two and a half catties of iron balls, a range of two hundred and eighteen zhang, four bounces on the soft soil. Behind each piece of data, Yan Lide also wrote relevant data, such as artillery angle, lead length, etc., which made people have to admire Yan Lide's meticulous work.

On the last piece of paper, data on the durability, ductility, and rigidity of the artillery were written. Finally, Zhang Yunwen's suggestion to cast artillery was also written.

"Yan Yuanwai writes well!" Zhang Yunwen approved, "Okay, let's transport this cannon back!" As he spoke, he was about to move the wheel, only to hear a soft "click", Zhang Yunwen hurriedly jumped away, and when everyone saw it, they also stayed away from the artillery.

I heard a soft sound at the wheels again, and then the two-wheeled car collapsed, and the two wheels spun around twice and fell. The cannon on the car suddenly pressed limply on the dirt.

Only then did Zhang Yunwen remember that the cars of this era could not meet the requirements of mobile artillery at all, and the artillery that could not be mobile could only be installed at the head of the city for the purpose of defending the city. It is far from the field artillery that Zhang Yunwen expected.

Thinking of this, he couldn't help but say to Master Lu and the other craftsmen: "The tasks now are: first, reduce the weight of the artillery; secondly, to increase the carrying weight and flexibility of the gun-carrying vehicle; Thirdly, research on new types of artillery. I'll tell you how to make the new guns when I get back! ”

Master Lu hesitated for a moment and said to Zhang Yunwen: "But my lord, now that this kind of artillery is not really finished, how can it be made into other artillery?" ”

Zhang Yunwen said: "Don't worry, this new type of artillery is called mortar, and the casting process requirements are very low, mainly artillery shells, anyway, you are studying conical shells, so even this mortar shell is also being studied!" ”

Hearing Zhang Yunwen's words, several masters looked at each other, this Master Zhang is really good at exploiting people, it seems that he has to squeeze their value out.

Zhang Yunwen saw the appearance of the masters, and said simply: "If the artillery research is completed this time, this official will ask His Majesty to reward you with a hundred copper coins and a medal!" That medal can be used as a family heirloom! ”

Hearing Zhang Yunwen's promise, this group of craftsmen was suddenly slightly excited. Zhang Yunwen smiled slightly: "Everyone, let's move this big guy back first, and pick up the iron balls that were shot, we still have to save some iron for Datang!" ”

Everyone laughed, packed up the place, and walked back with the barrels of the cannons.

(Well, I'm sorry, the power went out in the afternoon, and now I'm in a hurry for a chapter, less than three thousand words, brothers and sisters will just read it!) ）