The appearance of the pulley group made everyone's eyes shine, although they could also touch the hand crossbow, but the black box on the hand crossbow had never been opened, and even if they had opened it, it was useless, because in that small box Jia Yi made an anti-dismantling measure, as long as it was opened, it would automatically dismantle many fixed points inside, which was a secret method specially made to prevent the hand crossbow from falling into the hands of the enemy.

This kind of secrecy made many gentlemen itch their hearts, they have always wanted to know what was in the black box, and now they finally saw the real thing, and their faces were full of curiosity, when Jia Yi announced that he could conduct a hands-on experiment, two sets of pulleys appeared in front of Jia Yi, and then they were snatched up by many gentlemen.

The magic of the pulley set makes every gentleman's face full of happy smiles, no matter what it is used for, this device that can save a lot of effort has completely attracted the attention of the gentlemen.

Looking at the noisy classroom, Jia Yi finally completely relieved his heart, if anyone else dares to say that he is firmly standing behind Li Chengqian, without others doing it, Jia Yi will dare to give him a few big mouths, and personally bring him to the big classroom to see, the people here include at least seventy percent of the descendants of military generals, unless Li Chengqian is a big fool, otherwise he will never choose to be the enemy of so many people.

After successfully solving the huge burden on his back, Jia Yi found that he seemed to should do something mundane, at least stay away from the court, otherwise someone would always change the law and charge him on the head all day long, which was really unbearable.

Jia Yi's life has finally calmed down, since the last time Jia Yi let the gentlemen play pulleys, and Li Tai stood up to despise everyone, this task of imparting knowledge to the big guy has fallen into his hands, and free labor is not really useless.

"Do you know why people stand on the ground and don't fly in the air?" Li Tai asked loudly to everyone sitting in the audience in a serious manner.

It's a pity that although Li Tai's voice is very loud, there is no one in the entire classroom who can answer his question, and after scanning the people sitting in the classroom, the corners of Li Tai's mouth set off a slight arc, and then said loudly: "It's because of gravity." ”

The next thing explained became very verbose, and many people in the audience who were not very interested in gravity began to become drowsy, even if it was Li Tai, the king of Wei, who was standing on the stage, it could not affect their drowsiness in the slightest.

Li Tai's words directly made the squirm he was doing a few times, although his face was full of happy smiles, but Jia Yi didn't dare to let him continue talking, otherwise this teaching class would become a sleeping class.

"Well, let's go outside, I've got something fun for everyone." Jia Yi stretched out his hand and pointed to the clearing outside.

Jia Yi's teaching policy has always been entertainment teaching, and the gentlemen who knew this clearly rushed out of the classroom and came to the courtyard as soon as possible.

A small parachute has become a new toy for these gentlemen, and in order to let them know some knowledge, Jia Yi even told them about resistance when they were having fun.

Sometimes it will be a headache to meet people who draw inferences, Jia Yi met such a person, Li Ke as an expert in playing games, although he likes toys, but more than he hopes to be able to participate in the game, therefore, in order to be able to participate in it, he ordered someone to make a large parachute that is one foot long, and found a hill nearby, ready to let people jump down from the mountain to try.

Jia Yi, who heard the news, was suddenly frightened, but what kind of international joke, you are just getting into contact with this thing now, even if the parachute can really be made, but without many experiments and improvements, you want to send someone directly, this is not for science, this is his mother's murder.

After exhausting all methods, after finally stopping Li Ke, Jia Yi suddenly didn't have so much heart for teaching, these gentlemen were born to eat and wait for death, as long as their eldest brother didn't die, then they could basically only be rich and noble for a lifetime, so for the teaching of these people, even if Jia Yi explained it clearly, they would only find fun places, as for why this happened, they didn't think about it at all.

Anyway, these gentlemen just want to play, and Jia Yi has no idea of teaching them at this time, so he simply plays with them directly, and after teaching the new ones to Li Tai, Jia Yi started a good time playing with many gentlemen.

In fact, Jia Yi has always wanted to be able to go to the sky to see it, and even tried to make a hot air balloon to carry him to the sky when he was a child, but unfortunately, there were too few materials at that time, except for being able to send a candle to the sky, it was absolutely impossible for a person to fly up.

Now that I have time and money, let's play.

As the strongest skin, snakeskin became Jia Yi's target at the first time, and then many gentlemen began to search for snakeskins all over the street, and by the way, they caught a few of them and came back to peel the skin.

In just seven days, the snake skin in Jia Yi's hand was enough to make up all the ball materials needed for a hot air balloon, and the next thing was to sew, this huge project, Jia Yi could not complete it by himself, and directly found people who could sew clothes from the manor, put a large number of snake skins in their hands, and let them sew them into a huge pocket.

The bamboo basket under the hot air balloon is easy to say, there are many masters of this thing at home, but the ignition device makes Jia Yi worried, what should be used as the ignition device?

In later generations, people basically used gasoline to take hot air balloons, on the one hand, gasoline burns violently, and can be fully burned, which will not have much impact on hot air balloons, but at this time, where can Jia Yike go to find gasoline, after thinking for a long time, and finally only thought of one thing, that is, fierce fire oil, this thing burns impurities too much, and it is very viscous, it is really not suitable for violent combustion, but Jia has a distillation vessel for distilling spirits, but he can try to purify the fierce fire oil.

Due to the limitations of his current equipment, Jia Yi didn't think that the hot air balloon he made would allow him to fly as high or far, but as long as he could fly, it was already a very huge success.

Soon, a large amount of fierce fire oil was sent to Jia Yi, and then Jia Yi used a still to distill the fierce fire oil, and when he got a liquid with a much lower viscosity, he directly chose this kind of thing as a ignition, and as for the remaining fierce fire oil, it was all packed into the jar.

The advent of distillate oil made Jia Yi's idea a reality, although the jet equipment was not made, but Jia Yi chose another way to replace it, that is, the air blowing method, as long as the distillate oil does not temper after ignition.

The production of the first hot air balloon took a lot of manpower and material resources, and when people heard that something that could fly into the sky would appear in Jia's Manor soon, it quickly caused a sensation throughout Chang'an City.

From ancient times to the present, being able to fly into the blue sky has always been the most eagerly awaited thing, and now there are rumors that such a feat can be seen in Jia's Manor, how can you not rush over to take a look, as for the ticket, no one cares about a few money.

As a result, the hot air balloon has not yet taken off, but a large number of people are ready to come to watch, and in this process, every gentleman in the courtyard has made a small profit, and the matter of ticket money is still proposed by Jia Yi by chance, and it was specially decided after everyone agreed.

Li Tai had already put down what Jia Yi had prepared for him, and devoted himself to the process of helping Jia Yi make hot air balloons, as long as there was something he didn't understand, he would ask Jia Yi as soon as possible, and as long as there was something he didn't understand, he would also ask Jia Yi.

So much so that Jia initially felt that if he waited for this hot air balloon to be successfully launched, then Li Tai would definitely be able to make a second one in the shortest possible time.

Li Chengqian has no obstruction from Li Tai during this time, and finally has a firm foothold in the court, plus Jia Yi's side has been constantly problematic, which has attracted the attention of many people, and directly made Li Chengqian, a good baby, appreciated by Li Er again and again, plus what Li Chengqian has done during this time can always be very much in line with Li Er's appetite, and even Li Er has the idea of adding a burden to Li Chengqian's shoulders.

The ministers who saw all this in their eyes all understood that this credit belonged to Jia Yi, and some people with a heart really wanted to pull Jia Yi out to kill a hundred people to make an example, but listening to the loud cheers of Jia Yi in Chang'an City now, it made those who had a heart dispel all the thoughts in their hearts, of course, it may be more appropriate to hide.

Jia Yi, who was busy, didn't know, just because he participated in the dispute between the prince and the prince, it brought him endless trouble, and even brought him a lot of enemies, but now he is already busy and dizzy, and he has no time and energy to think about this, and now all his attention has been on the hot air balloon, such as today, everyone knows that he is making things that can go to the sky, if it is strained by then, he will have no face.

"I'm afraid of a hammer, no, I'll come when the experiment comes, even if it's death, I'm willing, the first person to fly, it's fucking fun to say it." Cheng Chumo was always afraid that the world would not be chaotic, and after saying a word, he directly made the scene completely riotous.