Shen Ding and the others were extremely excited after listening to Zhou Nan's slight revelation that he would be a prisoner, and from Zhou Nan's words, they all understood that Zhou Nan was ready to let them enter the prison and let them be the ones who were in prison.

Regarding the system described by Zhou Nan that Yanjing would be a prisoner, Shen Ding, Guo Xingzu and others naturally recognized that the salary paid to everyone was more than the wages earned in the market, and the family was exempted from labor and military service. If there are new skills and new things, there will be heavy rewards from the government, and even official positions will be promoted. The only requirement is that after signing the deed, you cannot leave the prison unless you wait for the permission of the government.

But compared to those favorable conditions, who will leave? Such conditions have never been seen in the Southern Dynasties!

Zhou Nan also told Shen Ding and others that when he returned to Yanjing, he would have people send a batch of good skins, and then Shen Ding would organize people to make six magic cars according to the improved technology, and they would all be made into the size of two people, and he would send someone to pick them up at that time.

As an artifact that can fly into the air to strike at the enemy, Zhou Nan naturally wants to give Gao Yuan, Yang Keshi, and Xiao Laoliu one each, and the place is small and the number of troops is small, Yanjing City has now become the capital of a country, and of course these two places need to leave one each as a weapon for defense. The rest is left to his own pro-army.

Shen Ding and the others listened to Zhou Nan's words, and went back to prepare the things to be applied, and rushed to make the magic car in time. Before leaving, Zhou Nan left Guo Xingzu alone and took Guo Xingzu to his study.

Guo Xingzu, as Zhou Nan's most relied on craftsman, of course understood that Zhou Nan had a confidential arrangement for him to leave him.

Sure enough, Zhou Nan took out a piece of paper from the bookcase, handed it to Guo Xingzu, and said, "Take a look." ”

Guo Xingzu took it, and saw a long cylindrical object painted on it, the front end was similar to an explosive arrow, and there was also an arrow connected to the back, but it was thinner and longer than the explosive arrow. Looking at the picture drawn, the long cylindrical object at the front end is hollow, and there are dots on it with a pen, Guo Xingzu understands that these dots represent the gunpowder filled in.

Zhou Nan opened his mouth but asked first, "Guo Zhizhao, do you know that there is a type of firecrackers in the Southern Dynasty, which is called fire?" ”

"I know," Guo Xingzu replied honestly, "this fire was originally separated from the artillery battle. A double-bellied cannon battle is a cannon battle that is pushed into the air by the lower section, and the inner middle lead ignites the cannon powder of the upper section and explodes in mid-air. This fire was caused by the force of the next section to rise into the air and explode, the difference is that the second section of the cannon is mixed with some different things, and in the dark night it emits all kinds of light. ”

Could it be that people in this period already used metals such as magnesium, aluminum, and barium? Zhou Nan asked with interest, "What's all involved?" ”

Guo Xingzu replied, "The smelting iron crumbs are finely ground and mixed in, and there will be bright spots like flint; Insert the rice husk and there will be a persistent red spark drifting in the wind. There are many things, the villain doesn't make firecrackers, and he can't remember it clearly. ”

Zhou Nan was disappointed, but the funny thing was that he didn't know how people were so bored at this time that they would think of mixing rice husks into it. Zhou Nan pointed to the thin cylindrical object on the map, and said to Guo Xingzu, "The front end is the explosive arrow, and the hollow long cylindrical thing in the back section is to ask Guo Zhizhao to make this long cylindrical crossbow arrow in the lower section of the fire." ”

Guo Xingzu looked at Zhou Nan with some doubts, and Zhou Nan explained, "The power of the explosive arrow is enough to hurt people and destroy things, but this explosive arrow is very heavy as an arrow, and the speed of the arrow shot is too slow, and it can't shoot far." If you use it too much, the enemy will be more prepared and can avoid it in time. This explosive arrow is to shoot the crossbow arrow with a hard crossbow, and the gunpowder in the long barrel is ignited by the lead at the same time as the crossbow arrow, and the crossbow force and the force of the gunpowder are combined, which will naturally make the crossbow arrow fast and far, and when it hits the target, the same front end of the explosive arrow explodes, blowing up the enemy soldiers and objects. ”

Zhou Nan is now arranging these craftsmen, more and more briefly, he just tries his best to explain the effects and uses he wants to receive to the craftsmen, as for how to make it, what kind of production, Zhou Nan is at the mercy of these craftsmen, and this time the same is true.

Guo Xingzu is also very adaptable to Zhou Nan's way, and he has been like this since the last bombing of the arrow. This time, Guo Xingzu had already understood Zhou Nan's intention, which was to make a crossbow arrow with enough strength and speed that was fast enough, and finally had the power to damage after being shot. One of the most ingenious is to use the lower section of the fire as the shaft of a crossbow arrow. Just imagine, even if you don't have the strength of a crossbow, just that long piece of gunpowder, you can still shoot this kind of crossbow arrow far away, if you have the power of a crossbow, even if you don't have the front of the explosive arrow, just as an ordinary crossbow arrow, its strength will be amazing.

The explosive arrow at the front end is the existing explosive arrow, and the hollow crossbow arrow shaft at the back is also simple, that is, the ordinary arrow shaft is cut, the middle part is hollowed out, and then a straight paper cylinder is rolled out with paper, filled with gunpowder, and then loaded into the hollow arrow shaft. In this way, the shaft of the arrow will not be skewed from side to side when the gun is sprayed.

The most important thing is how to control the ignition time of the cannon in the arrow shaft, just after the crossbow arrow is fired, not before the crossbow arrow is fired, otherwise the cannon flame spewing out from the back of the arrow shaft will hurt people.

Guo Xingzu just thought about it and saw the difficulty, he handed the paper back to Zhou Nan, and said, "The villain will go back and prepare, so that it can be made as soon as possible." ”

Zhou Nan said again, "There are also earlier explosive arrows, which must also be kept, but when making explosive arrows again, the iron arrows of the explosive arrows can be made smaller, lighter, and faster and farther when shooting, so that they are convenient to use." ”

Guo Xingzu replied: "The villain has written it down." It's just that both kinds of arrows can explode, how can you tell the name? ”

"The earlier one was still called explosive arrows, but now the kind I want you to make has more gunpowder in it that raises fire, and it is a crossbow arrow, so it's called a rocket!" Zhou Nan originally made this kind of explosive arrow according to the use of rockets in later generations, and of course he had to hand over rockets - long range, intensive use, and blowing up targets, from these three points, it can barely be called an ancient rocket.

"Yes, the villain wrote it down." Guo Xingzu replied respectfully.

Zhou Nan advised, "Gunpowder is an extremely strong thing, you must not be careless, let alone hurt yourself." ”。

Guo Xingzu saw Zhou Nan thinking about his comfort in his heart, and said excitedly, "Don't worry, the villain's life belongs to the master of the big village." The owner of the big village still wants the villain to do things, how dare the child lose his life casually? After saying goodbye to Zhou Nan, he bowed his head and went out.

Giving the matter of the rocket to Guo Xingzu to make it can be regarded as eliminating a hidden worry in Zhou Nan's heart. If one day the opponent secretly learns the art of making hot air balloons, this rocket is the weapon that Zhou Nan used to attack the shield with a spear. When the opponent is attacking in a hot air balloon, when the ordinary bow and arrow are not within range, taking out the rocket and firing several arrows in unison will definitely be a nightmare for the soldiers on the opponent's hot air balloon.