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The next morning, Scrooge and his entourage boarded a luxury express train from New York to Cleveland. Although it is a so-called "luxury express", its distance is really not fast. Compared with the degree of more than 300 kilometers per hour of high-speed rail in later generations, the degree of this train is terrifyingly slow. It is only 30 kilometers per hour, and it has to stop from time to time, so it takes more than a day to travel about 460 miles from New York to Cleveland, that is, about 740 kilometers. This also gave Maxwell ample time to discuss electromagnetism with Scrooge.

"Well, this is derived from the displacement current in your previous article "On the Lines of Force in Physics", right? I really didn't expect to have such an idea. Scrooge said with a frown as he flipped through Maxwell's little paper.

"Yes, that's it. But I always feel that this inference is missing something, not deep enough. It seems that there should be further deductions. Maxwell furrowed his eyebrows as well.

"Anna, do you still have a blank slate?" Scrooge looked at the pile of scratch paper in front of him and shook his head at Anna.

"Well, there's more. I'll go and get it. Anna stood up and prepared to go back to her box to get the manuscript paper for the calculations.

"Ah, Anna, make me another cup of tea, it will be strong...... Mr. Maxwell, would you like to order? Scrooge turned his head to look at Maxwell.

"Ah, give me a drink too." In high-intensity calculations, everyone will feel tired. Relying on strong tea to refresh yourself is also a common practice.

"yes, okay." Anna nodded and stepped back.

"Ah," Scrooge stretched out without an image. "Math is a blessing. It's a pity that we can't travel with a hand-cranked computer as well. By the way, I heard that there is a computer called abacus in China, which is very easy to carry and use, and it is said that it is not slower than a hand-cranked computer. When, Jean Warren? Mr. Delano got me a few abacus guys from China to try. ”

"Got something like that?" Maxwell was also a little interested, "Is this rumor reliable?" ”

"Reliable or unreliable, just find it and try it, it won't cost much anyway." Scrooge said. He knew that in later generations, when the first atomic bomb was made in the Rabbit Country, many numbers were calculated by calculation. So for the calculation power of the abacus, Scrooge still has a lot of spectrum in his heart.

At this time, Anna held a tray with two cups of tea and a thick layer of scratch paper underneath the tray, pushed open the door and walked in.

"Thank you, Anna." Scrooge stood up, took the tray from Anna's hand, and placed a cup of tea in front of Maxwell, picked up another cup of his own, and took a sip of it.

Anna placed the scratch paper on the table, then sat silently to the side, looking at Scrooge. She saw Scrooge put down his cup, took a piece of scratch paper, and began to do the math again. At this time, the train turned slightly, and the sunlight shone through the white curtain, shining on Scrooge's head and face, scattering a colorful halo on Scrooge's golden sideburns. The sunlight turned Scrooge into a black silhouette studded with gold trim in Anna's eyes. Anna sat there quietly, looking at Scrooge, she thought that Scrooge, who was so focused on calculations, was so cute, if it weren't for the fact that someone else was there, she really wanted to go up and touch him and kiss him.

"Well, Mr. Maxwell, I suddenly had an idea." Scrooge stopped writing suddenly.

"What?" Maxwell quickly stuck his head out.

"You see, if you combine the formula for displacement current with these formulas, it seems very interesting. And so and so and then and so and so and ......so and so and so Well, Mr. Maxwell, do you have any ideas for what's next? ”

"I'll see," Maxwell took the scratch paper from Scrooge's hand, looked at it, thought for a moment, and suddenly laughed, "Mr. MacDonald, look, let's do a transformation of this, and then ...... And then you get such a formula! ”

Scrooge glanced at it, and this was an important part of the influential Maxwell's equations in later history, and after a series of guidance from Scrooge, this equation finally appeared several years earlier than the original history.

"This equation?" The play was about to continue, Scrooge snatched the scratch paper, looked at it carefully for a while, then picked up the pencil and calculated, and after a while, he said with a shocked face: "Look, Mr. Maxwell, according to this equation, I have calculated something!" ”

"It's ......"

"The degree of electromagnetic waves predicted in your calculations is about 3o million kilometers per second, isn't that the degree of light?" Scrooge excitedly said, "If there is no problem with this equation, then can it be proved that light is an electromagnetic wave?" ”

"This ...... That's really ...... Let's test it again. Maxwell suppressed his excitement and said.

……

Time passed minute by minute, and the two of them were still busy, when a train attendant gently knocked on the door. Neither Scrooge nor Maxwell paid attention, but Anna, who had been staring at Scrooge with fascination, reacted. She gently opened the door.

"What's the matter?" Anna walked out softly, closed the door with her hand, and asked in a low voice.

"Miss, it's lunchtime. I'd like to ask you ......," the waiter replied.

"Not for now. But be ready. "These two gentlemen may also go to dinner at any time." "There will always be some privileges for guests in the luxury box.

"Okay, I understand, miss." The waiter turned around and prepared to leave. At this time, there was a sudden cheer in the box: "Mr. Maxwell, we can be sure that there will be no mistake in this!" Light is an electromagnetic wave! "The next step is to find a way to design a real yàn to prove the existence of electromagnetic waves!" Well, I'm going to give this equation a name, let's call it the Maxwell-MacDonald equation! ”

Anna smiled and said to the waiter, "I think these two gentlemen should be able to eat on time." ”

……

In the dining car, Maxwell quickly stuffed all kinds of food into his stomach, whether it was bread with French foie gras and truffles, or bread slices with caviar, he quickly stuffed it into his mouth without distinguishing and ate it quickly.

"Honey, you have to slow down!" Mrs. Maxwell was a little dissatisfied.

It wasn't until Mrs. Maxwell opened her mouth that Maxwell realized that there was something wrong with his approach. So he smiled embarrassedly and said, "I have just made a breakthrough in the joint research with Mr. MacDonald, and I am in a hurry to finish eating and then go to study with Mr. MacDonald." ”

"Mr. Maxwell," said Laura, who was sitting not far from Scrooge, "I don't know much science, but I know that I must rest after eating, and I should not go to work immediately." In this way, you can take good care of your body. ”

"Thank you, Mrs. Joseph, for the reminder." Mrs. Maxwell smiled and thanked Laura, then turned her head and said to Maxwell, "My dear, I think what Mrs. Joseph said is very scientific. So, I suggest that you respect science, and after eating, rest for at least half an hour before continuing your research. ”

Scrooge, who was smearing caviar on his slices of bread, turned his face and smiled helplessly at Maxwell, and then he turned his eyes to see Anna next to Laura, smiling at himself while cutting a slice of foie gras with a knife. Scrooge knew that his mother's words were most likely instigated by Anna.

……

After eating, Laura took Scrooge and Carol and called Catherine and Anne to her box, and talked to Silas for more than an hour before letting Scrooge go.

Scrooge left Joseph and Laura's box with Anna in tow, and as soon as he reached the door of his box, he saw Maxwell waiting there with an anxious face.

"Mr. MacDonald, there's a stern question." Maxwell said.

"What's wrong?" Scrooge said with some surprise.

"Look at our equation." Maxwell took out a piece of paper, and it said the same Maxwell-MacDonald equation they had made this morning, "You see, in this equation both parameters are directionless scalars!" Maxwell looked stern.

"So what?" Scrooge hadn't figured it out for a while.

"So what? Doesn't this mean that the degree of electromagnetic waves is the same in any frame of reference? For example, if you light a lamp on a train and measure its degrees, I mean, if the light is indeed an electromagnetic wave, then the light you measure will be exactly the same as if someone in front of the train was standing on the ground. This, how is this possible? Maxwell's eyes widened, "Could it be that the aether can be stationary relative to any moving object?" ”

This question startled Scrooge, isn't this damn light question the origin of Einstein's special theory of relativity? Maxwell had this problem in such a short period of time. This couldn't help but make Scrooge admire Maxwell incomparably in his heart.

"Mr. Maxwell." Scrooge thought about it and felt that this was not a good time for the theory of relativity to come out. So he said, "Reproducible real yàn is the surest way to test the laws of physics." Perhaps, we can find a way to test whether it is correct or not. ”