When he learned that Wen Muzuo was still the boss of the Qingshan Hall's Robe Brother Torture Hall, Sun Yi asked tentatively:

"Hippocrates?"

Asking "Hippocrates" and answering "Aristotle" is a high-level incision that is limited to the big brother level in the Wolf Mountain Hall.

Wen Mu stood up and replied loudly: "There are many pears!" ”

The two of them talked about it, and Wen Muzuo knew that Sun Yi was not only the Tabu bag of the Jin Kingdom, but also the leading uncle of the leading uncle of Qingshan Hall.

Wen Muzuo pulled up the calf and saluted Sun Yi, and the two of them flew up and down with their hands, and finally turned into fists and solemnly reported to the court:

"The green mountains are green, and the Yellow River is yellow.

Two and a half miles, short and long.

Wen Shen and Niu Guangtian have seen uncle! ”

Sun Yi also hugged his fist in the same way.

The two looked at Sun Yi again, and in addition to the original awe, they were more close.

Since everyone is an underworld on the same boat, Sun Yi spoke a lot more casually:

"Your pig iron is not of good quality, too hard and brittle, and not very useful."

In later generations, there were many small iron ores in this area, but due to the high sulfur content, there were very few that could be used. Many pyrite ores can only be used to refine sulphuric acid in the name of iron ore, and there is a pungent smell of sulphur dioxide when they walk nearby.

Wen Shen was secretly surprised, the leading uncle's leading uncle didn't even look at how to know.

It is true that the iron mine in the village can only mint some coarse things, otherwise how can an iron mine not make a fortune after several generations of people guarding an iron mine in the grassland where iron tools are scarce.

"But", Sun Yi changed his words. "This kind of hard, brittle pig iron has sharp edges and corners when it is broken, and the bomb shell in the shape of a hollow ball is the most suitable."

Sun Yi assigned tasks to Qingshan Hall:

"You first conduct experiments and make models of bombs with a total weight of one pound and a total weight of five pounds. When the test was successful, the coalition bought it in large quantities. ”

A cast iron bomb with a total weight of one pound can be held in the hand, and a cast iron bomb with a total weight of five pounds can be held with one hand with five fingers. This is the specification of the bomb that Sun Yi planned early on.

Sun Yi continued:

"At that time, the cast-iron bomb can be detonated with a fuse or detonated by a violent impact. If you bury it in the ground, if you throw it, if you throw it, if you roll it down a mountain, if you put it in a river, if you put it into a river, you will be a mine......"

Several listeners immediately felt their blood boiling.

Sun Yi smiled and said: "It's easy to cast an iron shell, and it's not a matter of a day or two to make a usable bomb shell. If the iron shell is too thin, it will be shattered if it touches a hard object, and if the iron shell is too thick, there will be too few fragments after an explosion, and the specifications must be repeatedly modified during use. ”

"Actually, the explosives package alone can explode, and the addition of the casing is to increase the power of the explosion and protect the explosives. In addition to cast iron, bomb casings can be used in ceramic, stone, and even wood under the right conditions. You might as well send a few men to join the 3rd Battalion as 10,000 opponents and familiarize yourself with the use of explosives. As for the explosives you will need in the future, they will be provided by the coalition forces free of charge after this battle. ”

The explosives bags brought by the 3rd Battalion this time were smaller than those of the 1st Battalion, weighing one pound each, and they could completely explode in the air after testing. If it is necessary to increase the dose, it will be decided by 10,000 opponents in use according to the actual situation.

One specific application of a pound of explosives is to put in a wooden shell and mix it with stone iron sand as a simple version of a hand grenade.

But now Sun Yi hopes to be able to throw this "improvised grenade" with a catapult.

Wen Shen said: "This is simple! ”

Wen Muzuo walked into the courtyard, found a round log that was about the thickness of an arm's length of five feet, picked up the axe and "clicked" a few times to cut two grooves at both ends of the wood.

Wen Muzuo announced: "It's done!" ”

In the bewildered gaze of everyone, Wen Muzuo took two bows, one in front of the other and one in the groove of the log.

The two ox tendon bowstrings are hung on the bow of the back bow first, then the bow of the front bow is set, and finally the left and right are tied to a piece of raw cowhide.

Wen Muzuo pulled the raw cowhide with some effort, and the two bows bent at the same time, forming the shape of holding the moon in his arms.

Wen Muzuo said: "This is called a cicada, it's no problem to shoot out one or two catties of things for twenty or thirty feet." ”

In Sun Yi's opinion, this is a big slingshot with the power of two bows.

The ingenuity of the cicada is that the bowstring is placed over the bow of the front bow, which actually forms a set of movable pulleys, which can save half the effort.

Sun Yi decided to save another half of his strength.

He drove a nail at the end of the log, tied a cow tendon to the center of the nail, and pulled the two ends through the sides of the raw cowhide. This is equivalent to forming another set of movable pulleys.

Sun Yi pulled the cow tendon with both hands, took two steps back, and the two bows were easily filled by Sun Yi.

That's it! It's simple, it's durable, and it's definitely more efficient than throwing an "improvised grenade" with your arm!

At that moment, Sun Yi lit an electric candle in the yard, and Wen Muzuo led people to build this kind of "cicada cannon" with a log overnight.

After testing and comparison, the Manchurian bow was used in the front bow and the Mongolian curved bow was the best in the back bow.

The Mongolian curved bow is shorter and smaller than the Manchurian bow, and it belongs to the typical composite material recurve bow. The Manchurian bow is characterized by high tensile force, steady and accurate, while the Mongolian bow is characterized by high efficiency, long range, and insufficient single force.

The front bow of the "Combined Cicada Cannon" has to withstand twice the pull of the rear bow, and this combination is just complementary.

Finally, the groove of the "Combined Cicada Cannon" is more elaborate, and the bow will not shake after being snapped. One side of the log was planed flat to facilitate the bomb ejection. At the same time, a firing guide is engraved on the plane, which allows the firing of arrows.

When not in use, the log can be used as a flat pole for picking things, and the raw cowhide is wrapped in the center of the flat pole as a shoulder pad. A cow tendon is fixed at each end of the flat pole, which can be used to tie things.

When used, the flat pole is not divided into front and back, and the two archers cooperate to quickly combine into a double bow, one to open the bow and the other to aim.

The disadvantage is that you need to find a bracket when opening the bow.

Wen Muzuo originally wanted to make a special wooden frame, but was stopped by Sun Yi. It is better to install a special wooden frame on the city wall or on a ship, and the third battalion will temporarily find trees or stones to make do with it.

Sun Yi took a set of wooden bomb shells. This was remade by craftsmen in Qingshanzui Township using wooden cannons dug up by the Third Battalion. Bomb casings are round or square, and there are also polyhedral shapes.

The bomb casing was split in half, hollow in the middle. Fill a bag of sand weighing a pound and throw in some gravel to fill the hollow.

The two bomb casings were closed and tightened with wire. Wrap another layer of straw rope on the outside, and get rid of a straw bale.

Put the raw cowhide of the "cicada cannon" into the straw bale, pull the bow and fire the cannon, and after adjusting the angle, you can hit 250 feet.

Unexpectedly satisfying.

Only Wen Muzuo was not surprised, he looked at the electric candle and pondered:

"Tabu can fiddle with thunder and electricity, and I can't say that the legend that he fell from the sky is true......"

Finally, when Sun Yi passed in front of him for the fourth time, he couldn't help but ask:

"Tabu Nang, did you come down from heaven?"

Sun Yi was afraid that others would ask this question, and it would not be good to answer "yes" or "no", so he could only give a standard answer without looking back:

"I'm not a god."