A scholar of Zhenguan in the Tang Dynasty

As a result, it has been covered with some mysterious colors. In fact, it is very simple. It is just a magnetic needle and it is not so magical.

Li Zhi looked at Gu Qing who was polishing the magnetic needle and asked, "Gu Qing, how amazing is this compass you are talking about?"

"This thing is not magical, it just points to the direction." Gu Qing said while polishing the lodestone, "Because it is easy to lose your way on the sea, and there is no reference point for the sea."

Grinding out a magnetic needle, Gu Qing put it in the water bowl.

Li Zhi looked at the thin magnetic needle floating on the water, "It's moving, this needle is moving!"

"Magnetic poles attract and repel each other. In a big way, the land under our feet is a big magnet. There are magnetic poles in the north and south, and they will respond to the magnetic needle."

Li Zhi held the water bowl curiously, no matter how he turned the magnetic needle, it would point to the north and south ends, "Gu Qing, it's amazing."

"It turns very slowly, and the direction deviation is a bit large." Gu Qing said while thinking, "It seems that we still need to use a compass, otherwise there will be problems with the direction."

"Is there anything I can do for you?" Li Zhi was excited as if he had discovered a big secret, although he couldn't understand why the ground under his feet was a big magnet.

"His Royal Highness, please keep quiet."

"En!" Li Zhi stood aside and looked at Gu Qing expectantly.

Half an hour passed, Gu Qing was still busy by himself, Li Zhi also stood for half an hour, looking at Gu Qing, his eyes changed from anticipation to bewilderment, and then anger.

"Gu Qing!" Li Zhi stomped his feet, "Do you mean to keep me quiet when you say help!"

"His Royal Highness Jin, you have realized it!" Gu Qing said with sincerity, "His Royal Highness, please keep quiet."

Li Zhi stomped his foot angrily and slammed the door out.

"You are so young and temperamental, just like his father, Huang Laozi." Gu Qing said to himself, his hands were busy all the time.

It is not difficult to make a compass, but the difficulty is sensitivity and accuracy. The pointer must be small, light, and flexible.

Another failure was made, Gu Qing sat down dejectedly, there were a lot of parts on the table, why is this compass so difficult to make.

Wu Mei came over with some buns, "Husband, it's been more than three hours."

Gu Qing took the bun and bit it down, it was stuffed with sauerkraut, Wu Mei also likes to eat sour when she is pregnant.

"The kid with the stomach is not making a fuss, right?" Gu Qing pulled Wu Mei to sit beside him.

"It's much more obedient." Wu Mei covered her mouth and chuckled, "I just saw His Royal Highness King Jin go out angrily, my husband must have bullied him."

While holding Wu Mei, Gu Qing whispered, "A loss is a blessing, it is a good thing to suffer a little loss when you are young, and only after you suffer a loss will you know what to do in the future when faced with the same situation, and you will learn a lot from it! "

"You can always say a bunch of inexplicable truths." Wu Mei said a bunch of parts on Gu Qing's desk.

"That kid still looks unhappy." Gu Qing sighed.

"So for my husband, His Royal Highness King Jin doesn't know his blessings, and if he bullies him, he still wants to thank him instead?"

"Not so bad." Gu Qing nodded vigorously.

Wu Mei covered her mouth and smiled and Gu Qing got up and said, "Xiao'er should wake up too."

"By the way!" Gu Qing pulled Wu Mei back, "A letter from Li's family in Zhaojun, what do you think about Di Renjie's marriage..."

Wu Mei knew that Gu Qing respected her opinion very much, in fact, she didn't need to ask his wife and concubines about the affairs, the family head was in charge, but she still said, "Di Renjie is not young, it's time to start a family."

"This kid is only 16 years old, is it too early?" Gu Qing hesitated.

"How can you be such a teacher." Wu Mei whispered, "A 16-year-old is already an adult. Di Renjie has been writing letters to and from the little lady of the Li family in Zhaojun all these years. My husband can't be a person who breaks up the marriage. .”

"Okay, as the old saying goes, it's better to demolish ten temples than destroy one marriage." Gu Qing hesitated again and again, "After dinner tonight, I'll ask that kid what he thinks."

"Let's ask this as a concubine." Wu Mei said, "You men always go straight, and you don't know how to talk about some things."

After Wu Mei finished speaking, she walked out of the laboratory, carefully closed the door for Gu Qing, and then went to the bedroom to take care of her son who had just woken up.

Gu Qing came back to his senses again and continued to study the compass. The compass of later generations can be seen everywhere and is easy to obtain, but it is not so difficult to do.

Chapter 496

The compass must be thin and light, and it must be minimized to be hindered by the magnetic force. Gu Qing used the ruler he made to perfect the parts over and over again. There is such a mysterious place in Gu’s house. Although there is no locked door there, there is no A servant will set foot there, and the word "laboratory" is engraved on the door.

Gu Qing was studying in the laboratory, Wu Mei took care of the child and was talking with Di Renjie.

"Master, the students are actually not in a hurry." Di Renjie said.

"We all understand what you're thinking." Wu Mei said to Di Renjie, "It's time for you to start a family. The Li family in Zhaojun is a family. You don't want to add unnecessary burden to the teacher because of your marriage, but don't worry, this Our family can still bear some of the burden, so don’t worry about it, life is only a few dozen years old, it’s not easy to meet a bosom friend, and it’s rare to grow old hand in hand with a bosom friend.”

"The students know." Di Renjie suddenly smiled.

For the past three days, Gu Qing has been staying behind closed doors at this house, and finally made a few compasses that satisfy him.

Wu Mei is already busy with Di Renjie's marriage, and she is going to build a new house in the village, and invite Di Renjie's old father in Taiyuan. Gu Qing has always taken him with him, but after all, Taiyuan's family is Di Renjie's. next of kin.

The whole Gu family was very busy. Li Zhi looked at Di Renjie's attire, "He's quite handsome, but he's still a little worse than me."

Di Renjie smiled at Li Zhi, "His Royal Highness, I want to get married, and you will be soon too."

"Me." Li Zhichang sighed, "Di Renjie, I envy you."

Li Zhi, who was three years younger than Di Renjie, had a bitter expression that didn't match his age.

"I also understand His Royal Highness Jin Wang." Di Renjie said to Li Zhi, "There will always be times when you have to, but the teacher said a word many years ago, with a willing attitude, live a life of peace with the situation."

"With a willing attitude, live a life of contentment?" Li Zhi wondered, "Why have I never heard Gu Qing talk about it?"

"It was a very early time. At that time, the teacher had just entered Chang'an, and His Royal Highness King Wei had just married at that time." Li Zhi said.

"At that time." Li Zhi was also thinking, "At that time I was still with my mother."

Li Zhi packed his bags and walked out of the house, "Teacher, I'm ready."

"I won't tell you anything this time. Just marry your wife and don't think about other things." Gu Qing smiled at Di Renjie. Things that I have never experienced before, I have fought at a young age, I have experienced conspiracy and schemes, and I have seen the sinister heart, but at this juncture, Gu Qing does not want to burden Di Renjie too much.

"Teacher, don't worry!" Di Renjie smiled and got on his horse. Looking back, he saw Wu's long welcoming team, and gifts from three carriages. Along the way, Zhang Yugong escorted him.

"Drive!" Di Renjie rode away.

"Your disciple has also grown up." Sun Simiao spoke while standing beside Gu Qing.

"It's been so many years, and it's time to grow up." Gu Qing smiled, looking at the little milk dog wagging its tail at Sun Simiao's feet, "Old man, winter is coming soon, and dog meat in winter is great."

"You'd better leave it as a dog." Sun Simiao said in a low voice, "Eat less meat and more vegetables."

"Okay, for your sake, I'll spare its life for now." Gu Qing nodded.