Joey said goodbye to Professor Koch and his brothers, and continued his plan.

There are still three small circles left, which have evolved into two by this time, Professor Röntgen and Professor Weber, who have merged with the circle of the German mineralogist Professor Hart and others, and are enthusiastically exchanging some information about the ore; Professor Karl Negri, on the other hand, was arguing with a few gray-haired elders about something about genetics.

Joey thought about it, and naturally it was easier for a circle of heated discussions to accept outsiders, and it was easy to hurt the innocent by rashly joining a circle that was arguing.

"Well, it's good to pay a visit to Professors Roentgen and Hart first." Joey set himself a goal for his next visit.

When he walked into Professor Roentgen and Professor Hart, Joey found themselves discussing the Crookes tube, invented by the Englishman Sir Crookes.

"William, these kinds of things you mentioned, I think I have a few ore specimens that can help you." Professor Hart said to Professor Roentgen, "One is scheelite ore that is symbiotic with calcite and black cassiterite, which I once stumbled upon and fluoresces purple when heated; The other is the black crystals of the ore produced in lead-zinc ore, called sphalerite. ”

"Thank you so much, Gerald. If I can, I'd like to have a drink in the evening. Professor Röntgen happily invited everyone, and saw Joey at random, "Hey, Your Royal Highness, Prince, hello. ”

"Hello, Dear Professor Roentgen; Hello, Dear Mr. Professor Hart; Hello, Dear Professor Webb...."Joey bowed to the big names in the circle whose names he could remember.

"We've all heard your speech from little Joey, it's great. You have concretized the thoughts of your father, His Royal Highness the Crown Prince, and we are all looking forward to your coming over to help us find out what we can concretize. Professor Weber, who has the largest grade in this circle and is also the most familiar with the crown princess's family, said.

"Dear Professor Weber, I have only made some trivial suggestions, the key to the development of German science still depends on the brains of the masters, and I have only done a little thing for my father." Joey said modestly, "Also, please call me Joey if you can, professors." ”

"Oh, Joey, we've actually listened to you one after another, so we're all trying to see if we can translate some of the knowledge we have into something concrete that can be applied, for example, after listening to your conversation with Professor Helmholtz about electricity and light, which inspired both Professor Webb and me, we thought of Sir Crookes's Crookes tube, which emits light when it ionizes some compound gases, and requires very little current, and it seems to us that it may well be an ideal light source." Professor Röntgen looked at Joey kindly and said.

"Professor Roentgen, do you mean a lamp that emits light from ionized gas?" Joey asked.

"Yes, this is the luminescence principle of the Cruise tube, but the biggest problem now is that after ionization, many metal element gases emit colorful light, such as what Professor Hart said just now, some emit blue-purple light. I've seen green light, red light..."Professor Röntgen shrugged his shoulders, "in any case, there are all kinds of colors, but there is no such light color as a white candle, you must know that the human eye cannot bear the red light, green light or purple light for a long time." ”

"Ionizing luminescence, why is this word so familiar, ah, by the way, the ultraviolet disinfection lamp in the hospital." Joey's mind was obviously diverged by Professor Röntgen's speech, "Yes, ultraviolet rays are very effective in disinfection, and even some agricultural pests have strong phototaxis to ultraviolet rays, this thing is good!" ”

"But ionization luminescence seems to be not only with ultraviolet disinfection lamps, there should be many things that can also use this principle.... Like what.... Like, oh my God, why can't I think of it? Joey frowned and pondered.

Professor Röntgen looked at Joey, who was looking uncertain and muttering to himself, feeling a little embarrassed, turned to Professor Webb and smiled and said, "Joey's face is really wonderful when he thinks about it, just like the painter's hand.... That one... Color palette. ”

"Palette?!" Professor Röntgen's word is like a bolt of lightning striking Joey.

"That's right, the palette! Professor Roentgen, you're right, it's the palette! Joey jumped excitedly!

"Mr. Professor, you just kept saying that red, green, and blue light are harmful to human eyes, and that's right! But have you ever thought about it? How did the painter make the white paint when he painted? Joey looked at Professor Röntgen expectantly.

"Joey, I'm not very familiar with painting." Professor Röntgen replied, a little embarrassed.

"Joey, you're talking about the three primary colors of red, green, and blue?!" Professor Weber had an epiphany on his face, and said to Roentgen with some excitement, "William, the Cruise tube is usually ionized by one substance, so there are monotones of red, green, and blue, but if you mix several substances that emit different colors in it, what color might be the ionized one?" ”

"White light, it maybe?" Professor Röntgen said hesitantly.

"It's possible that it's white light." Professor Webb smiled and nodded.

"It must be white light!" Joey nodded vigorously in the affirmative.

Professor Webb smiled and patted Joey on the shoulder and said, "Before the experiment, we can't be so sure, Professor Röntgen still needs a lot of experiments. ”

Joey smiled, and then said to Professor Röntgen, "Mr. Roentgen, the ionization lamps that emit blue-purple light, as well as red and green ones, please don't give up, maybe they have a lot of effects." ”

"What's Joey's new idea?" Professor Webb asked with a smile.

"Dear Professor Weber, since Sir Newton discovered that sunlight is composed of different wavelengths of light, and different wavelengths represent different colors, I have thought that since God created every color, then each color has its own reason, which needs to be discovered slowly by Professor Röntgen and everyone." Joey was cunning and cunning and began to think carefully.

"Relying on the phototaxis of insects to kill them, this is the discovery of biological agriculture in the second half of the twentieth century, and now there are no black lights, I said that I am not asking for a dead end..., as for the traffic lights... Now I don't even have a car, and this use is also self-defeating... It's better to wait for the conditions to be ripe in the future, and it will be natural to be able to say, and it's better to keep your mouth shut now. Joey thought to himself.

"Whew!" Professor Röntgen let out a long breath, "I have to admit that Joey is young, but there are many ideas that are geniuses. I never thought I could learn from painting. ”

"Mr. Professor, I'm ashamed to say that. These thoughts.... Belch... In fact..."Joey is stuck, these ideas are really not Joey's own, the principle of three primary colors is applied to fluorescent lamps, which are the creations of the famous Dutch Philips in the future, otherwise how can Philips fluorescent lamps be a world famous brand...

"Yours or not, you can open a window, and Professor Röntgen is likely to find out more! Isn't it Joey? Professor Webb looked at Joey with emotion.

"Of course, Mr. Webb. Professor Röntgen's Mr. Achievement is by no means on an ionizing lamp. Joey said loudly.

"Professor Röntgen's discovery of X-rays is his greatest achievement!" Joey added in his heart.