In the ballistics course on the second day, when Li Chun introduced Li Yu again, the students in the surveying and mapping department actually welcomed him.
"Great! I feel that Professor Li's level is higher than the previous teachers in Germany."
"And it was explained so thoroughly, without any meandering."
“I really don’t want to hear German Chinese anymore!”
"But why do I still not understand?"
"That's not Professor Li's problem. Can you be smarter?"
Li Yu smiled at everyone: "Today's class is still taught by me. It is mainly about some mathematical and physical application knowledge in ballistics. As for the specific application, other teachers need to teach it in person."
Li Yu quickly drew the coordinate axes, and then started to talk about trigonometric functions and basic calculus bit by bit.
Although these things are not unfamiliar to modern high school students, a bunch of seedling warlords are almost confused.
Li Yu didn't dare to go too deep. After deriving the function of time in the ballistic flight coordinate system, he didn't go on. Instead, he went back and derived it again.
This is his understanding as a student. Because when I was in class in college, the teacher was really too fast. If I didn't pay attention, I couldn't keep up with the rhythm, so I had to work harder on my own after class.
However, none of the following people have much mathematical foundation, and their levels are uneven. Li Yu can only explain it as briefly as possible.
Even so, many people still didn't understand and asked questions one after another. Li Yu could only answer one by one, and he continued to calculate the formula for the third time before he was almost done.
"Okay, today's class is over. Today's content is quite difficult. In order to consolidate it, I will give you some homework." Li Yu wrote a few questions on the blackboard.
To take care of their level, it's already very simple.
"Come on guys, copy it down. You need to check it in the ballistics course the day after tomorrow."
Li Yu chuckled in his heart, feeling a little relieved that these great warlords of later generations actually felt a little bit refreshed.
However, the time after class is not so free. "Good student" Sun Chuanfang often comes to Li Yu to ask questions, and even goes to Li Yu directly with the original German textbook to ask for answers.
The course that originally took more than half a semester was completed by Li Yu in less than a month, and he even did his own small research during the period.
The blackboard writings of his lectures were compiled by Wu Peifu and became the classic lecture notes of "Basic Surveying and Mapping" and "Basic Ballistics" in the entire Beiyang Army Crash Course.
Later students even copied Li Yu's course notes by hand, and wrote "Li's Basic Surveying" and "Li's Basic Ballistics" on the cover.
Until the later Baoding Military Academy, Li Yu's lecture notes were still used in these two courses, so one can imagine its influence.
But Li Yu doesn't know this yet. He only knows that he can finally leave.
Because those German teachers were on vacation for a month and finally came back! Judging from their skin color, they must have gone to the far south. They are really moisturizing! It is said that Germany is always on the Soviet-German battlefield and is unable to enjoy the holidays. It seems possible.
Knowing that Li Yu was leaving, Li Chun was still reluctant to leave. As a promotion in the academic affairs section of the coaching office, he has seen many teachers, from Germany and Japan, but this is obviously the first time he has seen one of Li Yu's level. Not only is his academic level high, he also looks at problems from a high level and his explanations are very clear.
With such teaching, he had a hunch that this group of students would do great things in the future.
However, he also knew that such a scholar could not waste his time in crash courses.
Yuan Shikai also knew that Li Yu was leaving, and even arranged a banquet to see him off. Feng Guozhang and Li Chun, as the relevant persons in charge of the school, naturally attended.
Yuan Shikai picked up his wine glass and said, "Thanks to your teaching during this period, I, the students of the Beiyang Army Crash Course, have been greatly benefited. I am very grateful!"
Li Yu said: "It would be great if I can help with my humble efforts."
Yuan Shikai continued: "Sir, why don't you just stay in our army? Everyone in Beiyang knows that I, Yuan, treat knowledgeable people with great respect. You can definitely rise in our army."
Yuan Shikai indeed valued educated people, otherwise Xu Shichang would not have been promoted so quickly after arriving in Beiyang.
However, Li Yu obviously didn't have this in mind. He replied: "Thank you, Marshal, for your kindness, but I already have a personal plan. If there is a need in the future, I will definitely help you again."
Naturally, Yuan Shikai could not force Li Yu to stay, so he had to say: "It is really a pity, but sir, I have done my best for Beiyang. If there are any difficulties in the future, I, Beiyang, will definitely help me to the end."
After all, Beiyang is also the most powerful force in the next twenty years. Perhaps with their care, there will be less resistance to some things.
And... and Li Yu also served as a teacher for second-generation warlords such as Wu Peifu and Sun Chuanfang, so it was considered useful after all.
Yuan Shikai did not miss any opportunity to find the shortcomings of his Beiyang army. He asked: "Does the young gentleman have any suggestions and opinions on all aspects of our Beiyang army?"
Yuan Shikai's question is not easy to answer. In fact, Yuan Shikai himself should know this kind of management problem best, so Li Yu said: "If possible, a small suggestion. I personally believe that unified weapons are more conducive to training."
During this period, Li Yu only saw that Li Chun had four or five models of rifles. He couldn't be like Ah San in later generations, who made standard weapons look like "IWC".
"It makes sense," Yuan Shikai nodded, "I have been thinking about this matter, but I have never been able to think of any way to completely avoid risks, but I will definitely focus on this matter."
Li Yu said: “In addition, I observed that although there are many military high schools, there seems to be no telecommunications school.”
Yuan Shikai wondered: "Telecommunications? What telecommunications?"
"It's just a telegraph signal. The commander-in-chief can understand it that way."
Feng Guozhang, who was next to him, interjected: "It is very difficult to set up telegraph cables now. We do not have the talents in this field, and the cables are expensive. Once the battle line is too long, it will be difficult to repair the cables if they break down."
Li Yu said: "So the school must be built as soon as possible, and radio will be used soon. Without relevant supporting personnel, it will become a blind man on the battlefield."
"Wireless?" Yuan Shikai asked in surprise, "How can wireless send a telegram?"
Li Yu said with a smile: "Now the West has begun to invest in this area, and I believe it will be promoted in a few years."
"Is there such a technology?" Yuan Shikai still didn't believe it.
Li Yu affirmed: "Of course, this is the future!"
After this period of time, Yuan Shikai had great faith in Li Yu at least in terms of science: "Okay, then I will listen to your teacher and establish a telegraph school as soon as possible."
Li Yu said: "Perhaps it can be called the Telecommunications and Signal School."
Yuan Shikai looked at Li Chun: "Remember this name. After the school is established, I will ask Mr. Li Yuxiao to write a plaque!"
Li Yu couldn't even refuse. The key was that he couldn't use calligraphy!
After finishing the meal, Li Chun gave Li Yu a total of 1,500 taels of silver notes, "It's the commander-in-chief's kindness! Sir, please don't forget Beiyang!"
Good guy, so much money, almost twice as much, of course I can’t forget it.
Li Yu was really about to leave. What he didn't expect was that Wu Peifu, Sun Chuanfang, Li Jinglin, Cai Yubiao and other students from the Surveying and Mapping Department would escort him to the station.
Li Yu was even a little moved and shook hands with the students one by one to say goodbye.
I really hope that they can also be good people when they become warlords in the future. That would be a great blessing to the country.
