my scientific age

Chapter 34 Portable Lighting Sources

As a well-known existence in later generations, the basic skills that every student must master, eye exercises did not exist in this era. The earliest systematic eye exercises originated in Beijing in 1960, 23 years later.

But it is undeniable that the need to protect eyesight exists no matter what era it is.

This is Yu Hua's first cross-generational product after meeting Zhou Yuan and Liu Tao and other classmates.

Eye exercises are small, but the protection of vision is big.

When Liu Tao heard this, his face was very serious, and his heart was very moved. He bowed again: "Xie Yuhua taught me the secrets of the family.

Moving.

Very moved.

Liu Tao was able to obtain the invaluable eye protection method. This was an opportunity for him and his classmates. It is not difficult to see that Yu Hua could become the only classmate without myopia in the class, breaking away from this set of eye exercises that are comparable to the ancestral secrets. It doesn't matter.

Of the 22 students in the first class of Neo-Confucianism, 20 were short-sighted, and only Yu Hua and Zhao Anyuan were not short-sighted.

In Liu Tao's view, this set of eye exercises given by Yu Hua is definitely a unique family knowledge, and its value is immeasurable.

"I'm waiting for Xie Yuhua to teach you the secret of eye protection."

Zhou Yuan and the rest of the classmates bowed again and faced Yu Hua as students.

"..."

When Yu Hua saw Liu Tao who showed his sincere feelings, as well as Zhou Yuan and other classmates, he couldn't help laughing and laughing. Can this set of eye exercises be called a unique skill?
The tenth set of radio gymnastics in later generations and the times are calling. Does it have to be called peerless martial arts?
Well, helpless, but helpless, but the feeling in front of me is very comfortable.

"This set of eye exercises is not a family secret, it's something I usually think about. You don't have to do this. Besides, if there is no space in the library, we can pool some money to buy a battery and electric light off-campus to make portable lighting. The light source is used in the dormitory for everyone to use." Yu Hua continued modestly.

The lights in the dormitory are very short every day. The self-study ends at [-] o'clock every night. After class, the lighting time is only half an hour, and the light bulbs are still on.

If you have a portable lighting source, you can easily study until 12 o'clock in the evening.

"Make a light source?"

Zhou Yuan was stunned when he heard Yu Hua's words.

"Student Yu Hua, can you come up with a light bulb?!" Liu Tao stared at Yu Hua, his words a little surprised.

The eyes of the other three classmates were all focused on Yu Hua, and their expressions were not far from Zhou Yuan and Liu Tao.

Everyone responded with surprise to Yu Hua's proposal.

"Of course, the portable lighting source is not complicated. It only needs batteries, inverters, lamps, circuits and circuit switches. The physics book said, what's wrong with your classmates?" Yu Hua was puzzled when he saw everyone's reaction. puzzled.

To use a portable light source as a dormitory, this thing is as difficult as no.

Seeing Yu Hua's puzzled face, Zhou Yuan, Liu Tao and other classmates looked at each other with helpless expressions on their faces.

"Yu Hua, to be honest, I, I can't wait... The physical circuit experiment has never been done, and my husband has never taught us how to make it."

Zhou Yuan sorted out the wording and told the truth. At the end, he sighed softly: "The important thing is that we never thought that we could make electric lamps for lighting and reading."

Liu Tao and the three classmates were silent and a little ashamed.

As a science student, everyone in the science class has naturally learned the physical knowledge content of circuits and electric lights, but since they have been exposed to physics until now, they have done very few physical experiments, which can be described as a handful.

As for the experiment of electric circuit lights, this thing completely exists in books, and everyone has never done relevant experiments, so it is extremely unfamiliar.

But it's not the things that matter, it's the thinking.

Everyone in the No. [-] dormitory has read the science books for so long, but they have never thought of using the knowledge in the physics books to apply it to real life.

This is the gap between them and Yu Hua.

"It's fine, I'll make it. I'll go out this weekend to buy a battery and a light bulb, but I need everyone to contribute." Yu Hua's expression was calm and calm. It's not easy to create a portable lighting source without any technological content.

These days, batteries belong to the accessories of automobiles, which are in the category of luxury goods. They are expensive. Inverters and lamps are also expensive. In addition to miscellaneous copper wires and switches, the cost of a complete set of accessories can reach 30 yuan. about.

Brothers, settle accounts.

Since you want to develop a portable lighting source, unless you use it alone, then the dormitory owner must contribute together.

"No problem, I'll pay half of it." Zhou Yuan was overjoyed when he heard that Yu Hua could handle it, and immediately replied.

After realizing the importance of the light source to the eyes, Zhou Yuan was very displeased with the kerosene lamp on the desk, and he was already looking forward to using the portable dormitory light source made by Yu Hua.

Liu Tao shook his head and said, "Equality, equality is the most important thing, Zhou Yuan, everyone, except for Yu Hua, each has a second share of the cost, how about it?"

"I don't agree. Since everyone is using it together, I should contribute capital. It's not reasonable for the public or private." Yu Hua shook his head and raised his hand in opposition.

"Okay..." Liu Tao saw Yu Hua's firm gaze, opened his mouth, wanted to say something, but stopped, so he had to agree.

"I agree to contribute."

"I also agree to contribute."

The other two boys raised their hands and agreed that they can use electric lights and protect their eyes. This is a matter of killing two birds with one stone.

"I agree. In addition, a friend of my father opened a Ford car repair workshop. You can buy it from there. The price can be 15% cheaper than the market. A nickel-iron battery for a car is only [-] yuan, and the price of light bulbs and other items is [-]%. If it can be reduced by [-] to [-]%, I will write to my father tomorrow to ask him to buy the corresponding equipment." Classmate Ji Han raised his hand in agreement, and then told his family's situation.

When Yu Hua heard this, he smacked his tongue secretly. He was really immortal. He drove the Ford workshop silently and looked at Ji Han: "The light bulb needs 100W power, so the brightness is enough for the dormitory use. I will write a list of materials to You, you report the cost to us, and everyone will share it equally."

"No problem, I'll get the money first, and the materials will be ready in two days." Ji Han seemed generous and frank, and said bluntly.

"it is good."

As soon as he said it, Yu Hua was not polite, and responded directly, took out a pen and scratch paper, sat at the table, wrote all the materials needed to make a portable lighting source, and handed it to Ji Han.

With the current knowledge reserve, is it difficult to research portable lighting sources with no technological content?

No.

Although, Yu Hua has never made a portable lighting source.

It's good to start with portable lighting sources.

Zhou Yuan was full of anticipation. Liu Tao and the other two classmates surrounded Yu Hua, staring at each item of material on the scratch paper, with a hint of longing in their eyes.

This is the desire for light.

As a student, the most eager for light, because light symbolizes the ability to read books and absorb knowledge.

"Come on, the list of materials is ready, I'll give it to you." After a while, Yu Hua finished writing the list of required materials, put down the pen, and carefully checked whether it was right or wrong. This was the first technological product he was about to study during the Republic of China. Care must be taken.

After the inspection, I handed it to my classmate Ji Han.

Ji Han hurriedly took it, carefully placed it in his arms, then sat down to write a letter, ready to give it to her husband and mail it to her father tomorrow.

Taking advantage of this opportunity, Yu Hua sat down again, wrote down the eye exercises, and taught them to everyone.

Everyone seems to be like a treasure, while learning eye exercises, while treating them carefully, daring not to make any mistakes.

"You can practice eye exercises first. I'll go wash up first." After he was done, Yu Hua smiled when he saw everyone's appearance, picked up his plastic basin and toothbrush cup, turned around and left, and went to the toilet to wash up.

Outside the dormitory, it was freezing cold and the wind was howling.

Fortunately, there is also hot water supply from the school's boiler room in the toilet, which is reserved for the last batch of students from the library to return to the dormitory, wash their faces and rinse their mouths, and quickly take care of personal hygiene. After Yu Hua returned to the dormitory, he found that Zhou Yuan and others were Do eye exercises.

With a straight posture and a serious face, he looks like a primary school student doing eye exercises.

Back in the dormitory, Yu Hua glanced at everyone who was doing eye exercises, without disturbing each other, got on the bed, wrapped up the bed and fell asleep.

Good night, Yu Hua.

Tomorrow will definitely be better.

……

The next day.

The teaching building, the first class of science.

(End of this chapter)