The next day, Chen Xu slept until three o'clock in the morning before getting up, washed up, ate and drank and then took the car to the Academy of Sciences.

"Master Hou, didn't you rest well last night? Why does it look a little blue! Zhang Cang, who had been on the morning shift for an hour, watched Chen Xu come in with two dark circles under his eyes, and couldn't help but stand up and care.

"No, I feel fine!" Chen Xu couldn't help but touch his face, but he didn't feel the difference, so he laughed a few times and said, "Not long after the wedding, I did sleep a little late last night!" ”

"Oh, hahaha, it seems that there is a lot of heart!" Zhang Cang instantly understood, laughed happily and said: "Hou Ye came to see this nine-chapter arithmetic book I compiled, and I carefully proofread it several times after finishing the book, I hope Hou Ye can still help to check one or two!" ”

Chen Xu looked at the thick stacks of hemp pulp paper full of words and drawings on Zhang Cang's table, and turned a few pages casually, only to see that his eyes were full of dense numbers and formulas, and instantly felt that his head was as big as a bucket, and he was slightly dizzy, but he still looked at it roughly and said: "Very good, very good, the example questions are detailed and illustrated, once this book is printed, it will definitely have a good guiding role in many measurement and calculation work, and now I am preparing a new printing house, and I plan to use copper mold movable type printing, Your book will be used as the first book for proofreading, and when the time comes, it will be used as a teaching book for the School of Engineering......"

"Really? Great, thank you Lord Hou! Zhang Cang excitedly bowed to Chen Xu and gave a big salute.

"Why thank me, your book can be called an epoch-making masterpiece, as soon as this book comes out, your name Zhang Cang will definitely be passed on for eternity, and I will write you a promotion and you can also follow it!"

Zhang Cang excitedly opened another stack of manuscripts and said, "Master Hou, I also wrote some problems for calculating the cutting and angle of square circles according to the geometric formulas you mentioned before, and there are also some questions about parabolas that I would like to ask......

"There's no rush on this matter, I'll discuss it with you when I'm free!" Chen Xu waved his hand and hurriedly left the office.

Mathematical problems are the most complicated, Chen Xu's mathematics is also very general, simple geometry and equation problems can be solved, complex and esoteric as early as in school to the teacher, and Zhang Cang's mathematics is not bad, and his understanding is extremely high, many mathematical problems Chen Xu can find rules and solutions by drawing inferences from each other with a little mention, which can be called a mathematical wizard, and Chen Xu and him discussed in depth and detail a few times, Chen Xu found that his mathematical skills had been exhausted, so he was not very interested in chatting with Zhang Cang now, Because some of the mathematical theories that Chen Xu said every time would make Zhang Cang feel novel, and then he would get to the bottom of it, which was very sadistic.

For the next whole day, Chen Xu almost forgot to sleep and eat in the gunpowder research room, constantly researching and making fireworks bombs.

Busy until the evening home, after dinner and wait until sleepy and ready to fall asleep, the water gently brought in a large bowl of fragrant beef bone soup, Chen Xu drank it and felt the small motor in his body turn again, so he hugged his wife into the room and continued to happily hi, and tossed for most of the night without shame before falling asleep.

Two days later, at noon, the sun was strong, and Chen Xu ordered the carriage to be prepared, put an iron cylinder with a tripod and some messy things on it, and then took the car out of the city, accompanied only by Yu Wuya and five guards.

After walking all the way out of the city to the north for more than ten miles, Xianyang City was no longer visible at all, so Chen Xu asked people to find a wasteland where there were no farmers nearby, and asked a few guards to move the iron cylinder down and set it up on the ground, and firmly pressed the tripod with stones.

"Master Hou, it's all done!" The leader of the guards said, wiping the beads of sweat rolling down his forehead.

Chen Xu stepped forward to check the barrel of the gun, shook it a few times with his hand and found that it was placed quite steadily, so he ordered to take down the gunpowder, fuses and made fireworks shells from the car.

The diameter of this iron cylinder is about ten centimeters, the thickness of the pipe wall reaches two centimeters, and there is a small hole on the side of the base, which is used to insert the lead, which is actually an earthen mortar, but the barrel is adjusted vertically upwards.

First insert a lead wire into the barrel from the small hole in the base, then pour it into a pound of black powder, use a wooden pestle to tighten it, and then stuff a very tight paper tube into it, and also use the wooden pestle to go down and make thorough contact with the gunpowder, after finishing it, Chen Xu looked up at the sun hanging on the zenith and ordered everyone to step back twenty zhang.

"Engong, can this little bit of gunpowder still blow up this iron pipe?" After everyone retreated, Yu Wuya said with a little disdain while holding the iron sword.

"How powerful do you think of the handcuffs?" Chen Xu did not answer directly.

"It's very powerful, I can't get rid of it within a zhang, even Gai Nie may be injured!" Yu Wuya said with a serious expression.

"The handcuff is only loaded with about half a tael of gunpowder each time, and it is a pound in it, not to mention that this firecracker bomb is also loaded with half a pound of gunpowder, do you say it is powerful?" Chen Xu took out a wooden box as he spoke, opened it and took out a small wooden stick from inside.

Yu Wuya's face suddenly changed when he saw the cannon barrel, and when he saw Chen Xu take out the match, he knew that he was about to light the fire, so he said that he was careful, and then he ran out like a rabbit and hid behind a big tree more than ten meters away.

It was no problem to help Chen Xu fight, but since seeing the power of the firearm, Yu Wuya felt that his small mortal body was still not at the same level as the pseudo-immortal art transformed from the immortal art, so he had a sense of fear from the bottom of his heart about gunpowder.

Chen Xu squatted down with a little black skin, blocked the wind with the help of weeds, and then fluttered and scraped several Daqin brand matches on the box before he finally lit the matches, and after lighting the lead, he also turned around and hugged his head.

The impact of a pound of real black powder explosion is enough to sweep the surrounding area of several meters, if the barrel is really blown up, and the fireworks inside will also explode, and the iron filings will be splashed in all directions, and it is estimated that there will be no chickens and dogs left within ten meters.

"Eun Gong's side~"

Seeing Chen Xu jumping and running over, Yu Wuya hid behind the tree and beckoned to Chen Xu very righteously, but Chen Xu directly ignored it and jumped into a dirt pit that he had been optimistic about for a long time.

Under the strong sunlight, I waited for nearly two minutes, and suddenly there was a loud bang, and the barrel of the cannon placed in the grass shook suddenly, and with a strong fire and green smoke rose into the air, a black light in the barrel of the cannon instantly burst into the sky, and then exploded with a bang, releasing a puff of smoke and was quickly blown away by the wind.

Chen Xu crawled out of the pit with a happy face, patted off the dirt on his body and walked to the front of the gun barrel to check it, and found that there was no problem except for the slight displacement of the gun barrel.

"How high did the fireshow bomb fly?" Chen Xu covered his forehead with his hand, looked up at the clear blue sky, and asked.

"It's about fifty zhang!" Yu Wuya looked up at the sky for a long time and then said.

"It's okay, try again and go back!" Chen Xu asked the two guards to turn the barrel upside down and knock the gunpowder residue inside, and after fixing it, insert the lead again, fill the gunpowder, put in the fireworks, and let everyone disperse and ignite it again.

Two minutes later, the fireworks bomb exploded again in the air of Chenggong, and it was not as high as the first time, so Chen Xu ordered to pack up and leave.

After running so far with Chen Xu, Yu Wuya was naturally depressed, and rode a horse to the side and said, "Engong, didn't you say that after this fireworks bomb exploded in the sky, the sky was full of colorful firelight, why didn't I see anything but smoke?" ”

"This firework only looks beautiful at night, and the sun is strong during the day!"

"Then why run so far, you can put it directly outside the city!" Yu Wuya was even more puzzled.

"I'm also afraid of causing panic among the people in Xianyang City, the last time I tested the grenade, I alarmed the emperor, not to mention that this time I was going to give all the people of Xianyang a surprise, naturally I couldn't let them know in advance......"

The carriage was bumpy all the way, and the two also chatted while walking, Yu Wuya looked at Chen Xu's dark circles and somewhat pale face, hesitated a few times and swallowed his words back.

"Brother Yu, do you have anything to say?"

Yu Wuya's personality is like a bamboo tube, not only the intestines are straight, but the thoughts are also straight, known as a straight man, so any thoughts can be easily seen on the face.

"Engong, I have a sentence, I don't know if I should say it or not?" Yu Wuya still didn't hold back his words.

"Brother Yu, you and I are like brothers, what should I not say, let's say, what is the matter?"

"Engong, you and your junior sister have been ...... recently That one...... I sleep late every night, and some things should be tempered! ”

Uh, Chen Xu glanced at Yu Wuya, then looked up at the blue sky and the strong sunshine, and said with a few twitches of his face: "Did you hear everything?" ”

"Well, it's not just me, the people of the Hou Mansion have heard a lot, even if this kind of bed joy spreads outside the mansion, it is not inappropriate, but this has been so unrestrained for several days, and after a long time, the loss of the essence element has led to a lack of yang energy, have you noticed that your face has been much worse in the past few days......

Chen Xu looked up to the sky and sighed and said: "I don't want to, but it's a pity that my mother spends time boiling me a bowl of beef bone soup every day, and I can't help it every time I drink it, and I'm very energetic!" ”

"Engong, there's something wrong with the soup?" Yu Wuya was silent for a long time and then whispered.

"What?" Chen Xu's body shook suddenly, his face changed greatly, he turned his head to look at Yu Wuya's serious and serious expression, and patted the handrail a few times: "Stop, stop!" ”

"Yu~" The groom hurriedly stopped the carriage, Chen Xu jumped off the carriage and walked under a tree more than ten meters away, and Yu Wuya also dismounted and followed.

"Brother Wuya, that beef bone soup was made by my mother herself, how can there be a problem?" Chen Xu knew that Yu Wuya had never lied, and since he said that there was a problem, it was naturally grounded.

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