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And Lin En, who came from the Sea of ​​Mist, was willing to recruit a halfling as an apprentice and let him participate in the production process of such a sophisticated alchemical creation as the airship. This surprised several people, and they even wondered darkly whether the adult had any special hobbies.

"Can't wizards also join the Iyeta School and become Master Lynn's apprentice?" Alex said excitedly. Those civilians who also longed to become wizards also looked at Darren eagerly.

"Of course, Lydia is the best example!" Darren said proudly, and then thought about it and added, "But you have to be a very, very smart person!"

Very, very smart? Alex hesitated for a moment, thinking that he might not be able to meet this standard, but he still looked at Lin En who had just walked down from the airship with a glimmer of hope.

The first time he saw Lynn, Alex felt that she was young, too young!

Maybe not even twenty years old.

But it was this wizard who was a few years younger than himself who came up with the great idea of ​​measuring planetary data, put it into action, and achieved impressive results.

At this moment, Lynn was having a pleasant conversation with the legendary wizard Harof. Even though he was too far away to hear their conversation, Alex could guess that they must be discussing more profound magical philosophies.

However, all this was just his fantasy. In fact, Lynn was telling Harrof about the love-hate relationship between Newton and Apple...

Chapter 155 Glass Mirror and Micro-Deformation Magnification

"So the legendary wizard named Isaac was hit on the head by an apple and discovered the existence of gravity?" Harof asked curiously.

"Yes, it is said that Lord Isaac was just a formal wizard at that time. After an academic discussion on the movement of stars, he suspected that there must be an invisible force pulling the planets in the galaxy to revolve around the sun. It was not until he walked under the apple tree and was hit by a falling apple that he suddenly realized it..." Lin En explained with a headache.

No one knew what went wrong, but on the way back by airship, Harof suddenly became interested in the fictitious legendary wizards of the [Arcane Society]. As a last resort, Lynn had to tamper with some anecdotes about celebrities in order to fool people.

However, Harov was obviously unaware of this and was immersed in the celebrity stories told by Lynn.

What surprised him the most was that when the legendary wizards of the [Arcane Society] developed many magical theories, they were just apprentices, formal wizards, or even ordinary people who didn't know magic. However, they relied on arcane mathematics, amazing intuition, and extraordinary imagination to discover the truth contained in those sparse and ordinary phenomena.

For example, Isaac discovered the phenomenon of gravity because of a falling apple, and Kepler judged that the planet under his feet was a sphere based on the phenomenon of a lunar eclipse.

Maybe this is genius!

Harof couldn't help but think that it was only after he became a great wizard that his magic power and computing power increased. When he released magic, he caused a certain disturbance in the space and thus discovered the existence of gravity.

Compared with the experiences of those legendary wizards, Harof couldn't help feeling a little ashamed.

But at the same time, Harov also noticed a very important point, that is, Mathematical Olympiad!

Whether it is the three laws of the stars mentioned by Lin En, the law of universal gravitation, or even the measured planetary data, they can all be presented intuitively in the form of Olympiad mathematics.

Many complex explanations have been simplified and can be calculated as long as there is a formula.

Haroff calls it Olympiad thinking!

This is undoubtedly what the wizarding land lacks, and perhaps it is also the reason why the [Society of Mysticism] can make rapid progress in the study of magical scholarship.

Thinking of this, Harof begged Lynn to compile some basic Olympiad mathematics knowledge into a book. He planned to apply to the parliament to make Olympiad mathematics a mainstream subject for various schools of thought to study.

Lin En naturally agreed happily. He had long wanted to unify all the messy operation symbols in the wizarding land, so that he wouldn't have to spend a lot of time figuring out what each symbol represented every time he flipped through the magic book.

The most annoying thing is that sometimes each school of thought uses different operation symbols for the same formula. For example, there are several πs to represent the value of pi, which makes him very confused.

"Since we have calculated all the data of the planet under our feet, can you now tell me what the gravitational constant is?" Harov asked curiously.

There is no doubt that the pendulum experiment and planetary data calculations that Lin En had previously conducted were all preparations for this most important thing!

"Lord Harof, I'm afraid you need to wait a few more days. In order to calculate the gravitational constant, we still lack a very important thing. By then, we can all intuitively 'see' the effects of gravity and the distortion of space." Lin En explained freely.

"Oh?" Harov immediately became interested.

Gravity is an invisible and intangible force. He can only compare it to water waves to understand the changes in space. However, Lin En said that there is a way for them to "see" the effect of gravity. How can he not be curious?

"Is there anything we can do to help?" Harov asked quickly.

"I'm looking for some raw materials for experiments." Lin En gave a general description of the appearance and properties of quartz and feldspar.

The method he used to calculate the gravitational constant was naturally the famous Cavendish torsion balance!

To replicate this experiment, you'll need light and some mirrors to reflect it!

After all, the influence of gravity is very weak, and only by using light projection to amplify the tiny disturbances a second time can the changes be perfectly presented.

Quartz and feldspar are two raw materials for making glass.

Of course, it is not impossible to melt the sand directly at high temperature, but in addition to silicon dioxide, the sand will inevitably contain many impurities, which will affect the quality of the finished product.

In addition, fluxes such as limestone and soda ash are needed. These two things are easy to get. Limestone is everywhere near the Yieta Harbor, and soda ash can be synthesized by yourself.

……

The parliament acted faster than Lynn had imagined. The very next day after he returned to Greenriel City, Harof sent people to transport several tons of quartz sand and feldspar on dozens of camels. They piled them high in front of the temporary residence, attracting a crowd of onlookers.

"Mr. Lin, if the quantity is not enough, I will ask someone to get another batch tomorrow." Korol said in a very respectful tone.

As a disciple of Harof, Korol did not dare to underestimate this young wizard who was becoming famous in the wizarding land, nor did he feel dissatisfied because he was appreciated by Harof. After all, Theresa's fate was a warning.

"That's enough! This is definitely enough!" Lin En looked at the quartz sand and feldspar piled up into two small hills, and the corners of his mouth twitched involuntarily. With so many raw materials, he could easily open a glass factory!

After rejecting the other party's offer of help, Lynn asked Lydia, Darren and other halflings to take some of the raw materials and return to the house.

The process of making glass is not complicated. It only requires high-temperature dissolution. The melting point of quartz sand is 1750 degrees, but the addition of soda ash and limestone lowers its melting point a lot. It is no problem for Lin En to use magic to create this level of high temperature.

Under the curious gazes of Lydia and others, the decomposed granular quartz sand gradually melted under the effect of fire magic, turning into a red liquid that kept flowing in the palm of the hand, and then placed into the round mold that had been made long ago.

After the glass was completely formed, Lynn put tin foil on one side and finally poured mercury on it.

Mercury is a liquid metal that can dissolve tin and make it stick tightly to the glass plate. When it is completely solidified, a smooth, flawless glass mirror that can clearly reflect a person's shadow appears in front of everyone.

Chapter 156: Even if you rob money, it won’t be this fast!

"Professor Lin, what is this? A mirror?" Lydia used a chair to prop her feet up, leaned on the lab table, and stared at the smooth and flawless round mirror in front of her, asking in surprise.

There are mirrors in the wizarding land, but they are all polished copper mirrors. It is said that some wizards will cast magic on them, but Lydia is sure that even the best copper mirror in the wizarding land is not one-tenth as good as it!

"Yes, I call it a glass mirror." Lynn nodded with a smile.

Darren and other halflings also gathered around, staring in amazement at the clear image reflected in the mirror.

"Perfect, so perfect... It's even clearer than the reflection on the lake." Darren couldn't help but exclaim in admiration. He had never seen such a beautiful mirror. It was like a work of art.

After obtaining Lynn's permission, the halflings carefully reached out their hands, held the round mirror in their hands, and gently touched the transparent mirror surface, as if the precious round mirror would be broken if they exerted too much force.

Lin En found it a little funny to see Darren and the others' expressions as if they had seen rare treasures. He originally thought that since the wizards had a preliminary understanding of the movement of stars, they should have pointed out glass, a necessary technology for astronomical observation, long ago.

After asking Harof, I found out that the wizards of the prophecy school had developed various kinds of long-sighted magic in order to observe the starry sky, and even upgraded the alchemical eyepieces several times, but they had never conducted research in this area.

There was no other way. Magic was so useful that Lin En began to get used to using magic to solve problems. For example, this time when making glass, normally a furnace was needed, but he solved it all with just a flame magic.

Lydia fiddled with it left and right, staring at her reflection in the mirror with delight. No girl could resist such a smooth, flawless glass mirror that could clearly reflect her face.

"Professor, is it made of this special sand?" Lydia handed the round mirror to the next halfling reluctantly, looked at the basket of raw materials on the table, and asked curiously.

"How is this possible? This must be the effect of magic!" Darren said with great certainty.

How could such an exquisite glass mirror be made simply with some sand and stones?

So there must be some magic added!

Lydia ignored Darren and looked directly at Lynn, waiting for his answer.

"Yes, the main component of glass is silicon dioxide, which can be found in sand. The production process does not require any magic. You just need to use high temperature to melt it and then shape it into the shape you want..." Lynn nodded, confirming Lydia's guess, and then briefly explained the production process of the glass mirror.

Now that the glass mirror has been made, Lin En is naturally not satisfied with simply using it for an experiment. This novel product is bound to set off a new trend in the land of wizards.

As for the subsequent mass production, it is impossible for him to be responsible for it personally. There are not many people who are trustworthy now. These halflings have at least been tested. During the period of operation of the airship, Darren delivered a sufficient amount of magic gold coins to him every month, and there was no such thing as embezzlement.

As for the leaked airship blueprints? Darak got some of the information after he got Ralph's body from Sheriff Leia and searched his memory with psychic magic.

He couldn't blame a dead man for not being able to keep the secret in his mind, right?

Of course, Lin En also retained some slightly more complicated techniques, such as the production methods of mercury and tinfoil. He planned to teach them to several wizard apprentices separately and split the entire production process into parts, so as to avoid the leakage of the formula to the greatest extent.

After Lynn finished explaining how to make the glass mirror, all the halflings were a little surprised. Apart from the high-temperature furnace needed to melt the quartz sand, there was almost no technical difficulty.

The cost is also extremely low, probably only a few silver coins are needed.

But if it were for sale, Darren believed that even if the price was twenty magic gold coins, there would be people rushing to buy it!

The profit is thousands of times, even if it is robbing money, it can’t be done this fast!

……

Two days later, at noon, thousands of wizards gathered in the hall of the magic seminar, discussing the next topic with great anticipation.

They have all received the news that Lin En will be here today to reveal to them the last secret of the planet beneath their feet.

"What method do you think Lord Lin will use to weigh the weight of the planet under our feet this time?" Raphael looked at August beside him and said thoughtfully.

He thought about it for two whole days and pulled out a lot of hair, but still had no clue. It seemed like something that was simply impossible to do.

"Probably using the division method, just like when measuring the circumference." August's face was filled with a confident and easy-going smile.

"Now that we know the volume of the planet, we just need to select a few areas as samples, weigh them, figure out how many cubic meters of soil weigh one ton, take an average, and then use the volume ratio to roughly estimate the weight of the planet!"

"Of course, this is just my humble opinion. The geology of different regions is different, and there are special situations such as mines and oceans, which need to be discussed separately." August said very modestly, but still revealed his estimated value. "The weight I calculated is about 300 trillion tons! The error should not exceed 20%!"

Raphael and others also sighed that August was worthy of being the star of the magic world. His brain was really useful and he could actually think of such a method.

They all heard that after Lin En returned to Greenridge, he immediately had two piles of sand and gravel transported over. Now thinking about it, he was probably estimating their weight.

Roll also looked at August with great admiration. He felt that his teacher had seen the truth, and this was probably the only way!

As they were talking, a burst of sneers came from the side.

"Mr. Korol, do you have any different opinions? Or have you found a better way to measure weight?" Roll looked at the wizard beside him with dissatisfaction.

"Sorry, I don't know how to measure weight." Korol shook his head. He only knew that Lin En needed the sand and stones not for measuring weight, but to make some experimental equipment.

Without waiting for anyone to question him, Koror pointed to the curtains that were suddenly drawn around him and said with a smile, "But I guess it has something to do with the darkness!"

Chapter 157: Lin En’s outrageous statement: gravity does not exist?

dark?

Raphael and the others paused for a moment, and then they felt that all the light in the hall had disappeared, leaving only a little light coming through the skylight on the roof, shining on the platform.