Vol 2 Chapter 889: Engineering, a new world! (Continued)

In the early stages of optical development, the interpretation of color was particularly difficult. Before Newton, Europeans' perception of color prevailed in Aristotle's view. Aristotle believed that color is not the objective nature of objects, but people's subjective feelings. The formation of all colors is the result of the proportional mixing of light and dark, and white and black.
In early 1666, Newton made a triangular glass prismatic mirror and used it to study the color of light. To this end, he made the room lacquered and made a small hole in the window to let in the right amount of sunlight. He placed a prism at the entrance of the light so that the refracted light could hit the opposite wall. Through this experiment, he got a colored spot on the wall, the color arrangement is red, orange, yellow, green, blue, Indigo, purple. Newton called this color spot the spectrum.
Later generations called this experiment the light dispersion experiment!
In 1830, Thomas Young, a British doctor and physicist, opened a small hole in the blinds to allow light to pass through, and used a mirror to reflect the transmitted light. Then he used a piece of paper about 1/30 inch thick to split the light into two beams from the middle. The result was intersecting light and shadows.
This is the famous Young's double-slit interference experiment, which shows that two beams of light can interfere with each other like waves. This experiment also played a vital role in the creation of quantum science a century later.
Li Zexuan moved these two experiments to the Tang Dynasty to let the students of the academy understand that the sunlight they see every day is not as simple as it seems! Just a kind of wonderful substance, understanding its inner part will derive a lot of incredible things!
At this moment, the curtains in the auditorium have been opened, but most people still haven’t recovered. They can’t figure out why there are only two beams of light, but they seem to have turned into many beams on paper. Li Zexuan is How did you do it?
"Shanchang, what was it just now..."
A student couldn't help standing up and wanting to seek the truth, but halfway through the question, he couldn't keep asking, because he felt that Li Zexuan would definitely be as prevarication as before.
Sure enough, Li Zexuan waved his hand and said, "Let's put this aside first, and I will take you..."
"Make a little game!"
Before the next few words were uttered, all the teachers and students helped Li Zexuan out in unison, and the voice was so hot, so hot, so angry, Li Zexuan on the podium felt a strong resentment against his face. what!
"Ahem! So you all know it!"
Li Zexuan sweated on his forehead and said awkwardly, then he took out two iron boxes and shouted to the side by the way: "Mo Zhong, Mo Yun, come here!"
The two brothers had come down from the roof. Hearing that Li Zexuan had something to do, they had to run over again.
"You two hold a box by yourself. Pay attention to the wires in the middle. Don't get too far apart from each other, otherwise I can't spare you if you break the wires!"
"Yes, yes, long mountain!"
The two brothers quickly agreed, and one took a box.
"Now you two go and stand there!"
Li Zexuan pointed to the back corner of the auditorium and said.
The two brothers left.
Everyone is unknown, but there are two exceptions, Li Tai and Cheng Chumo, because they have not only seen this thing before, but also played it.
Li Zexuan took out two more iron boxes (one with a voltaic battery and the other with a telegraph). After the wires were connected, he raised his head and said, "The next little game will be more interesting. Have you ever thought that one day two people thousands of miles apart can send messages to each other?"
Sun Zifan: "Send a letter!"
Wang Meng: "You can also pass the book by flying pigeons!"
Li Zexuan shook his head and said, "With a distance of thousands of miles, how long does it take to deliver the letter and the flying pigeon? The two things you see today can be transmitted thousands of miles apart in the future!
"Wow!"
"This.... How is this possible?"
"Thousands of miles away, spread the letter in an instant, isn't this a fairy method?"
Everyone off the court was in an uproar again, saying that the number of times they were shocked today was more than in the past combined, and Li Zexuan was always shocking and dying every time!
"Because of the limited space, let's do a ten-meter-interval transmission experiment first! What kind of noise the box on my side will make, what kind of noise will Mo Zhong's hand make!"
Li Zexuan opened the tin box and began to send a "telegram."
"DiDi! Di~! Di~! Di~!"
Two short and three long!
Almost at the same time, the iron box in Mo Zhong's hand also made a sound of "DiDi! Di~! Di~! Di~" two short and three long voices.
Although the students and teachers feel it is amazing, most people still don't understand it very well.
"Shanchang, just how do you send the message?"
A student stood up and asked.
"Hehe, good question! This classmate, carefully recall the voice you just heard, is it long and short?"
The student condensed his eyebrows for a while, then replied, "Yes, Shan Chang!"
"Then think about it again. If I combine these long and short sounds with each other, and different combinations correspond to a word, for example, the two short and three long sounds correspond to the word "Li", then can I pass this message? Is it?"
As soon as the voice fell, there were exclamations!
"Wow, why didn't I think of it? Shan Chang's method is really amazing!"
"I just don't know how far this thing can travel!"
At this time, Li Zexuan said again: "According to my preliminary test, with this thing, you can achieve mutual information within 30 miles! If you make a slight improvement in the future, it is not a dream to exchange information thousands of miles away!"
"Wow, more than thirty miles? That's amazing!"
"It's amazing! It's amazing! An iron box can spread letters for thousands of miles!"
The auditorium is boiling again!
The older generation of college gentlemen looked at each other in shock. At this moment, they really feel that they are old and can't keep up with the times!
"Well, this will be revealed for the time being, there will be a good show later! Mo Zhong, Mo Yun, please both of you to clean up these things!"
Li Zexuan showed a fascinating smile once again and ordered.
It is impossible for him to explain the principle of the telegraph in detail now!
The students showed a "surely so" expression one after another, UU read www.uukanshu.com but now they are too lazy to complain, so they stay silent and watch Li Zexuan's performance.
I saw Li Zexuan bring a basin of water from under the lecture table, and then took out a box and two tubular colored glazes. Then he looked at the crowd and smiled: "The next moment is the moment to witness the miracle. You will see The real is out of nothing~!"
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Pay the debts before, and try to pay them off this month!
In addition, let’s talk about rewarding and adding changes. This knight has never officially said it before. Today, I will only add five changes to reward the leader at one time. It’s not because the knight is playing big cards, the knights really have no cards to play. , Mainly because the knight is now at work, and there is less free time. If you ask me to add 20 more, I can’t add it. It’s really too tired after work every day. It’s not easy to maintain two shifts a day, the main thing is to hope Everyone keeps the book currency to subscribe. It is already very happy to have subscribed knights, don't ask for rewards!
Thank you book friends for your company along the way, and thank you for subscribing, I wish you happy every day!
(End of this chapter)