Kapitel 139: 139 - Rotating
"It's finally time for us to make our appearance."
After watching for a while, Elok and the others were already brimming with excitement. After receiving Lynn's approval, they immediately ran up to the platform with a large box in their arms.
Yulande, feeling a bit uneasy, approached to take a look. The large box contained various peculiar items, with the most prominent being a massive iron ball embedded with a protruding spike at the bottom.
"Masters, please allow me to use magic to make some adjustments here so that the experiment's effects can be more visual," Lynn said.
"If you think it'll be helpful," Raphael nodded in agreement.
Lynn immediately cast "Fossil to Mud" and turned the large stone bricks beneath into fine sand. Then, he had Jenny and the others assemble the stone slabs from the box, creating a giant disc on the platform's outer edge.
The edges of the disc had precisely marked three hundred and sixty divisions, each with a wooden stick placed in front of it.
Finally, Lynn asked the wizard who had developed flight magic earlier to suspend the iron ball from the ceiling of the conference hall using a steel wire.
Due to the need for magic demonstrations, the conference hall was not only spacious but also tall, with the ceiling standing sixty meters above the ground.
The thirty-kilogram iron ball was suspended just a little over ten centimeters above the sand by a thin steel wire. The protruding spike at the bottom was already buried in the sand.
"What are you planning to do?" Yulande was completely perplexed, unable to comprehend Lynn's actions.
The other wizards in the audience wore similarly puzzled expressions.
"I'm conducting an experiment." Lynn waved his hand, asking Elok and the others to stand aside and then asked, "Mr. Yulande, what do you think will happen if we push this iron ball with force?"
"The iron ball will be pushed forward and then swing back and forth in a straight line. Do I need to explain that?" Yulande responded impatiently.
"I don't think so," Lynn shook his head, "because you've overlooked a crucial factor, which is that our continent is rotating. The resulting Coriolis force will affect the swing of the pendulum. So, when the pendulum swings, it will continually change direction and revolve around this disc."
"Absurd." Yulande couldn't believe in something like the Coriolis force caused by the rotation of the planet. It was completely preposterous.
With these thoughts in mind, Yulande kept a close watch, fearing that Lynn might pull off some tricks during the experiment.
Lynn didn't even use magic this time. Instead, after positioning the iron ball at the zero-degree mark on the sand disc, he let go, allowing the iron ball to swing freely under gravity.
The nearly sixty-meter-long steel wire remained taut due to the weight of the iron ball. Under the influence of gravity, it produced a slight whistling sound as it struck the wooden stick representing one hundred and eighty degrees on the opposite side.
Just as Yulande had said, the iron ball's path was indeed a straight line.
The eyes of all the wizards in the room were fixed on the pendulum. Due to the length of the steel wire that held the iron ball, the swing was not very fast, but it was extremely regular and did not deviate as Lynn had predicted.
Yulande waited for a while, but there was no change. He immediately looked at Lynn and taunted, "Where is the pendulum's rotation around the disc that you mentioned? I didn't see it."
"You're too impatient, and your observation isn't careful enough, that's why you couldn't see it," Lynn sighed.
Yulande was very irritated. He wasn't blind, and he could surely tell whether or not this thing was rotating.
At that moment, a cry of astonishment suddenly came from someone.
"It's deviating. The trajectory is actually deviating."
Several grand wizards even stood up from their seats, closely watching the sand disc below the pendulum.
Where was it deviating? Yulande followed everyone's gaze and realized that the fine needle at the bottom of the iron ball didn't leave a completely straight line on the sand disc. There was a slight deviation with each swing.
However, this deviation was incredibly small and couldn't be seen with the naked eye. It could only be discerned by examining the traces left in the sand as the pendulum swung.
Thud...
Accompanied by a slight dull sound, the wooden stick representing one degree was knocked over, and the pendulum then knocked down the wooden stick representing one hundred and eighty-one degrees.
Both the imprints left on the sand and the fallen wooden sticks undeniably proved that the pendulum was slowly moving, and it wasn't swinging aimlessly. It was consistently deviating to the left.
"Wind. The wind must have blown it." a divination wizard exclaimed loudly.
Yulande immediately thought of this, but before he could speak, Philip sarcastically said, "This is indoors. Where could the wind come from?"
"Even without strong winds, air is always in motion, and even the slightest influence matters." Yulande argued, neck stiff.
In any case, he absolutely refused to believe in something as non-magical as the rotation of the planet.
"Masters, since Mr. Yulande has doubts, please turn this area into a vacuum," Lynn suggested with a smile.
This time, Ogest stepped in. He was also very curious about this intriguing pendulum deviation phenomenon. Following Lynn's request, he removed all elements from the entire disc, creating a vacuum in the area without affecting the pendulum's movement.
Yulande held his breath, staring at the disc, eager to see if the iron ball's trajectory would change in the absence of air.
Ten seconds... thirty seconds... one minute, the pendulum continued to deviate to the left, with the same degree of deviation as before.
The wooden sticks representing one degree and one hundred and eighty-two degrees also fell over one by one.
"Now, there's definitely no wind, right." Philip said mockingly.
Yulande's face turned red and blue. He opened his mouth but couldn't speak. There was no magic, no wind interference, so where did the force that caused the pendulum to deviate come from?
Could it be that the so-called Coriolis force really existed?
As time passed, more and more wooden sticks fell. In the conference hall, the wizards who were originally sitting in their seats had all crowded around the platform, eager to observe this mysterious experiment up close.
"This is unbelievable. Our continent is moving; it's really moving." a witch screamed loudly.
"It's incredible, a miracle in the history of magic. We really live on a constantly rotating planet." Raphael exclaimed, deeply moved.
TL/n -
The Foucault pendulum or Foucault's pendulum is a simple device named after French physicist Léon Foucault, conceived as an experiment to demonstrate the Earth's rotation. If a long and heavy pendulum suspended from a high roof above a circular area is monitored over an extended period of time, its plane of oscillation appears to change spontaneously as the Earth makes its 24-hourly rotation.
The pendulum was introduced in 1851 and was the first experiment to give simple, direct evidence of the Earth's rotation. Foucault followed up in 1852 with a gyroscope experiment to further demonstrate the Earth's rotation. Foucault pendulums today are popular displays in science museums and universities
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