Traveling through history leaving a name

Chapter 57 Questions and Answers
Cao Cao praised Zhang Qingfeng so well that Zhang Qingfeng felt a little embarrassed.

No wonder it is recorded in history that Cao Cao likes to praise people the most. Almost all of his civil servants and generals have been praised by Cao Cao.

After Guo Jia's death, Cao Cao praised him as a genius of the ages.

Even Master Yi of the later generation said that Cao Cao praised people and was unique in the world.

Seeing it now, it really is.

"I heard that Mr. Wenqu star descended to earth, and knows everything about astronomy and geography. I don't know if Mr. Cao can show his skills?" Cao Cao said to Zhang Qingfeng.

The play is here.

When Cao Cao came to visit Zhang Qingfeng, he naturally wanted to see for himself whether Zhang Qingfeng was really talented.

"I don't know what the prime minister wants to know?" Zhang Qingfeng didn't panic at all.

"I once heard Du Fu say that the earth is round, but I don't know why it is round, and how did I know it?" Cao Cao asked.

"The earth is a circle, which can be calculated through observation and mathematical methods..."

Zhang Qingfeng explained: "If you want to know that the earth is round, there are many ways to observe it. One of them is a lunar eclipse. When the sun, the earth, and the moon are in a straight line, a lunar eclipse will form. The reason is that the earth blocks the sun. Light……"

"In addition, you can also use a high-powered telescope to observe ships on the sea. When the ship is getting farther and farther away from the mainland, the ship will slowly disappear. The first thing to disappear is the hull, and the last is the sail. On the contrary, if the big ship When returning from the sea, people often see the sails first, and the hull last. The reason for this is that the earth is round and curved, so the hull is blocked by the sea..."

Half an hour later, Cao Cao nodded half understanding.

"Actually, I believe that it will take a few years to know whether the earth is round or square. I have someone build a big ship. I plan to wait a few years for the navigation technology to mature, and then form a fleet to sail from east to west. Can't go back to Dahan."

Zhang Qingfeng said: "According to my calculations, at the speed of the fleet, it will take about two or three years to sail around the land and return to my man. If the fleet cannot return in ten or eight years, then the earth is not round. , or the entire fleet was wiped out."

"That's good, I also really want to know what the earth looks like." Cao Cao said.

"Sir, I came to Youzhou this time. First, I want to see the development of Youzhou. Second, I want to ask Mr. for his views on how to unify the whole country." Cao Cao said to Zhang Qingfeng.

Hearing Cao Cao's words, everyone pricked up their ears, wanting to hear Zhang Qingfeng's answer.

"If you want to unify the whole country, it's very simple, just crush them with a strong advantage." Zhang Qingfeng said with a glance at everyone.

"Oh? What is crushing?" Cao Cao frowned and asked.

"Prime Minister, let me ask you, what is the easiest way to defeat a weak enemy?" Zhang Qingfeng asked Cao Cao.

"Of course it's sending a large army to attack." Cao Cao said.

"That's it, just send a large army to attack." Zhang Qingfeng said: "The prime minister can wait a few more years, wait for Youzhou to build more ships, produce more advanced weapons and armor, wait for the grain harvest in all parts of the country, and wait for the training to produce more ships. More outstanding soldiers, when the time comes, send troops to crusade, and the whole country can be unified."

"This... I'm afraid it won't be easy." Cao Cao didn't believe it.

"What do you think of the plate armor, Prime Minister?" Zhang Qingfeng asked Cao Cao.

"It's hard to hurt with a sword and arrow, and it can be called a peerless armor." Cao Cao replied.

"Then let me ask you, if there are 10 people wearing such armor, who else can defeat you?" Zhang Qingfeng asked.

"This..." Cao Cao's eyes lit up when he heard Zhang Qingfeng's words.

Yeah, if there are 10 people wearing plate armor, who else can beat me?

"No, sir. Although the plate armor is good, it is inconvenient and too heavy. If the enemy does not attack by force but entangles with it, I am afraid it will be very troublesome."

Cao Cao said: "Besides, wearing plate armor is not suitable for attacking a city, it can only be used for field battles."

"The most important thing is that wearing plate armor is impossible for water warfare, and Sun Quan's men are proficient in water warfare. It may be difficult to rely on plate armor to unify the south."

"That's right, any weapon has its pros and cons, but Youzhou doesn't only have plate armor."

Zhang Qingfeng said: "This year, the Yuyang Military Factory has developed a crossbow arrow. The crossbow arm is made of stainless steel. It is extremely powerful and can break armor from a hundred steps away. This kind of crossbow is now ready for mass production. As long as you invest manpower and material resources , thousands of planes a month will not be a problem.”

"Is it true?" Hearing Zhang Qingfeng's words, Cao Cao stood up excitedly.

Others were also very surprised when they heard the news.

"Of course it's true. If you don't believe it, ask Yang Shen to take you to see it right away." Zhang Qingfeng said.

"No, there will be plenty of time to watch in the future." Cao Cao sat down calmly and said.

"Prime Minister, now you know why I said we can unify the whole country, right?" Zhang Qingfeng chuckled. "In the face of absolute strength, any conspiracy or trick is just a trick."

"Hahaha, I understand, I understand." Cao Cao laughed.

"What you said is the industrialization that Du Fu told me a few years ago. He told me that if the industrialization is mature, as long as the machines are turned on, all kinds of military supplies, weapons and armor can be produced continuously and quickly. Even if it is Equipping an army of millions is also extremely simple."

Cao Cao laughed and said: "I didn't believe it before, but now I believe it. I can't wait to see Yuyang's industrialization. Yuyang can have what it is today, thanks to the sir."

"Brother, sir, I have put a lot of effort into helping you." At this time, Cai Wenji, who was standing aside, interjected: "Sir, sir, knew that my brother's army was not good at water warfare, so he designed a large-scale ship and an inland river gunboat. With these two boats, you can be invincible whether on the sea or in the river."

"Oh? Seriously?" Hearing Cai Wenji's words, Cao Cao was pleasantly surprised.

"Of course, I can still lie to you. The design manuscripts of these two ships are in Mr.'s study." Cai Wenji said.

"Mr. Cao is a great talent. Cao has nothing to repay. Please be respected by Cao." Cao Cao bowed to Zhang Qingfeng and thanked him.

"Don't dare, dare not." Zhang Qingfeng waved his hand.

"Sir, may I have a look at the boat you designed?" Cao Cao asked Zhang Qingfeng.

"Well, I'm afraid I will go to Quanzhou." Zhang Qingfeng said.

"That's a pity, I can only look at it later..."

"Brother, sir, and the design manuscript, why don't you take a look?" Cai Wenji said.

"Yes, yes, yes." Hearing Cai Wenji's words, Cao Cao nodded quickly.

"Read the manuscript, yes." Zhang Qingfeng nodded in agreement.

"Why don't you follow me to the study, I have not only design drafts, but also two models of ships in my study..." Zhang Qingfeng said.

"Follow the master's arrangement." Cao Cao said.

(End of this chapter)