The principle of the Galilean telescope is simple.

It only needs to be satisfied that the light gathered by the convex lens falls exactly on the imaginary focus of the concave lens, and the user can see a clear, upright image through the eyepiece.

The magnification of this type of telescope is also easy to calculate, which is the ratio of the focal length of the eyepiece to the objective.

Rosen calculated the focal length of the lens slightly, and with Savi's help, he quickly came up with a concave lens that fits.

After putting the two lenses back in the magic mirror, he walked to the window, looked into the distance a few times, and adjusted the barrel slightly, and then Lawson nodded in satisfaction.

"How's it going? How's it going?" Savi asked repeatedly.

"It's okay." Lawson handed the magic mirror over.

Savi took the magic mirror, picked it up and looked out the window, and then gasped: "O god, this is a miracle! Rosen, you are so powerful, even more powerful than the alchemy master Parkland! ”

He held the lens barrel and kept adjusting the direction to look at it, and suddenly, his body froze, and his mouth opened slightly, as if saliva flowed out: "Oh~~ God, I finally know why the baron is so fascinated." ”

After saying this, he stood motionless by the window, as if it were wood.

Rosen waited for a while, and when he saw that Savi still didn't move, he walked over and patted the white fat man on the shoulder: "How did you do it?" Isn't it a magic mirror? Why are you so excited? ”

Savi was still holding the magic mirror and looking at it, and he muttered, "Look ahead, look ahead, that's the window on the second floor of the Night Demon House. Oh my God, Miss Lisa is picking up guests in her room~Oh~ she's actually lying on the edge of the window working...... Hiss~~What a coquettish~"

It turns out that this guy is voyeuring!

Lawson almost went crazy, snatched the magic mirror, and said with a straight face: "Okay, Mr. Savi, when you learn to make lenses in the future, you can look at it however you want, but now, it's time for you to fulfill the contract!" ”

Savi was still unsatisfied, but Rosen's words also had a huge appeal to him, and he sneered: "No problem, no problem, then let's get started." ”

Rosen nodded and pointed to the glass cauldron, "Burn the glass." ”

"Yes." Savi went to work.

Rosen began to conceive in his mind the tools he needed.

In the modern earth, there are many types of glass depending on the raw material and processing technology.

But in Sawi's glass shop, there is only one of the most common silicate glasses, and with this glass, at most you can make containers, but not burners, because they are very easy to crack after fire.

However, Rosen's purpose was not to make a burner, which was much better than glass, and his biggest purpose was to make a few glass needles.

In the other world, the most common use of the drug is oral, but penicillin is not resistant to gastric acid, and the effect of this method is slow, the waste of the drug is large, and the effect is far less good than that of needle injection.

Burning glass, Savi is a veteran, he expertly adds charcoal to the stove and pulls the bellows.

'Whew~Whew~'

The bellows constantly poured fresh air into the furnace, and the flames in the furnace immediately rose up, and in a few moments the glass in the crucible was once again burning into juice.

Rosen dipped the glass juice with an iron rod and looked at it, making sure that the glass had completely melted, he used the alchemy power again to remove the impurities and bubbles from the glass, and then said: "Come on, come on, pour the glass juice into this clay mold, the action must be light and slow, yes, that's all." ”

"Haole~" Savi skillfully picked up the crucible with iron tongs, and when he reached the top of the mold, he slanted slightly, and the glass juice like honey slowly flowed into a square mold.

Rosen stood aside, waiting for the glass juice to be almost poured, he condensed his spirits and activated the power of alchemy.

At this time, the glass is liquid and fluid, and what he has to do is to use the power of alchemy to directly control the glass molding, and only in this way can he create a usable glass needle under simple conditions.

The next moment, Savi saw a miracle again, and the glass juice poured into the mold actually moved on its own, as if it had life.

Although it was not the first time it was simple, Savi still subconsciously held his breath, as if as long as he breathed heavily, he would scare away the glass elves in the mold.

Lawson immediately shouted: "Steady~ Don't be nervous!" ”

"Goo~" Savi's throat moved, and he was more and more in awe of Rosen.

In the mold, the glass juice kept surging, and after about ten seconds, a smooth and precise glass tube floated out of the juice.

The glass tube is colorless and transparent, the luster is very pure, very round, very bright, and there is not a single blemish to be found.

Savi had never seen such a beautiful glass product, and he was stunned for a moment.

Lawson suddenly shouted: "Enough~ The glass juice is enough, take it back and continue to heat it." ”

Savi woke up from a dream and immediately moved the cauldron back.

When he turned his head again, he saw that the discrete glass juice had disappeared from the mold, leaving only a delicate and perfect glass tube, the thickness of the round tube was the same as that of the front and back, with a small hole at one end and a large hole at the other end.

On this side, Lawson wiped the sweat from his forehead, took out a meatloaf from his pocket and gnawed it down, eating 2 large meatloaf in a row before the hunger in his stomach disappeared.

Then, he picked up the cooled glass tube, turned it over and over and carefully examined it, and after looking at it for more than ten seconds, he sighed: "The diameter of the round tube is inconsistent, the inside is not smooth enough, the sealing is insufficient, and it is wasted." ”

The shape of the needle tube is much more complex than that of the lens, because there are sealing requirements, so the precision requirements are also higher, and the formation of the needle tube depends on the control of Lawson's thinking, and a slight force imbalance will affect the shape, resulting in the failure of the needle tube manufacturing.

Scrapped is scrap, and Rosen casually threw the syringe back into the glass crucible.

The fat on the fat man's cheeks trembled, and his teeth hurt: "This ...... Such a good thing, just don't want it? ”

Rosen looked at him sideways: "Since it's useless, why don't you return to the furnace?" I'm doing this to save you materials. ”

The fat man shook his head again and again: "No, no, no, you don't have to save, just use it, you don't want the waste, just give it to me, I'll cover it!" ”

This level of glass, no matter what shape it is, can be sold for a high price, and it is really a terrible thing to throw away!

"That's up to you." Lawson probably knew Savi's thoughts, but since it was cooperation, it was also appropriate to give the other party a little sweetness. After resting for a while, he had recovered his strength, clapped his hands and said, "Let's continue." ”

"Hey, okay." Savi's enthusiasm has increased dramatically.

In the time that followed, Rosen tried 10 times in a row, and each time he failed for various reasons, creating a large amount of waste, and he was so tired that his whole body was soaked with sweat. Savi smiled, and carefully and carefully collected the waste one by one.

Lawson was so tired that he rested for half an hour, ate and drank enough, summed up the lessons of failure, and then started working again.

This time, practice makes perfect, Rosen felt that he did it very smoothly, the whole molding process, overnight, very smooth, but also special labor-saving, after the needle tube was formed, he didn't feel tired, and the sweat on his forehead was not much.

When the needle tube finally cooled and formed, he began to check it carefully, and after looking at it over and over again for more than half a minute, he breathed a sigh of relief: "There are still some flaws, but it shouldn't affect the use." ”

He still had strength left, so he said to Savi, "Come, go on." ”

Taking advantage of the good condition, he decided to get a few more syringes.

Of course, Savi had no opinion, and began to pull up the bellows again 'hula~hula'.

For the rest of the day, Rosen continued to use alchemy, constantly shaping the glass.

By the evening, Rosen had scrapped more than 50 samples in a row, and finally succeeded in preparing only 3 usable glass syringes. In addition, in order to recuperate, a third of the working day is taken up by taking a break in the middle of the day.

However, while he was resting, Savi was not idle.

At Rosen's request, he used a hollow iron pipe to blow a large number of crystal clear glasses.

These cups require very little precision, and their only function is to hold a solution, and the blowing product is sufficient.

After a day's hard work, the effect is also there, and after using alchemy many times in a row, Rosen has a more delicate and precise grasp of his alchemy power, and he is more handy in using it.

He activated the alchemy talent tree again, and found that his alchemy proficiency had increased by a full 20%, to the point of 98%, and as long as he worked harder, he could be promoted to the third layer of the elemental friend talent.

"It's almost there, so I'll go back first. Oh, by the way, I'll bring this magic mirror to the Baron myself. Lawson gestured to the metal cylinder.

Savi felt a little regretful in his heart, this was a great opportunity to please the baron, but he was very in awe of Rosen, and he was even more expectant of the mirror-making craft that Rosen was about to teach him, so he handed over the magic mirror to Rosen without saying a word.

Rosen said with satisfaction: "If there are no accidents, I will come over on time tomorrow morning." ”

"Yes, Master." Savi subconsciously changed his name.

"Hmm."

Rosen nodded, and left Savi's glass shop with the glass container.

He first went to the house on the west side of the town, put the glassware away, then fetched a bucket of water from the well in the courtyard, took a hasty bath, washed away the smell of sweat, then changed his clothes, and tidied up his appearance, and after making sure that he looked decent, he went out with the restored magic mirror.

Out of the courtyard and out of the alley, Lawson walked along the main street towards the Baron's Court at the top of the hill.

When he reached the town square in front of the Baron's Palace, Lawson didn't go directly to the house, Anne was near this area, and he had to contact her first.

Looking around the square, Rosen didn't see anyone: 'Anne should be hiding, I can't see her, she should be able to see me.' ’

With this in mind, Rosen ran to a prominent spot in the square and waited for Anne to spot him.

As a result, after waiting for more than ten minutes, Anne still did not show up.

'Weird. But maybe Anne was distracted and didn't see me for a while. I'll ask someone. ’

He took out a bronze sparrow, pulled a passer-by, and asked, "There is a beautiful female stalker in the town, have you seen where she is?" ”

The town was small, everyone knew each other for most or less, and the stalkers were usually heavily armed and tall, and Anne was a big beauty, so she must have stood out.

The passer-by really knew, and he pointed to the tavern on the side of the square: "There is a big beautiful woman sitting in the tavern, I don't know if it is what you are looking for." ”

In these years, everyone has not enough to eat, most of them are malnourished, and there are not many people who can be called big beauties, and nine times out of ten it is Anne.

Lawson threw the bronze finch to passers-by and walked towards the tavern.

The tavern had a peculiar name, the pigeon's nest, which was very simple, and the appearance was a long wooden house, and when Lawson walked in, he found that there were only a few customers in it, and the tavern waitress was standing behind the counter, wiping her wine glasses in boredom.

Rosen looked around, not seeing Annie, but seeing a very special woman by the tavern window.

She has long burgundy smooth hair, wearing a gorgeous and delicate dark red leather armor, sitting with her back to Lawson, and she can't see her face, but the body curves shown by her back have already shown the temperament of seductive beings.

The passer-by was right, she was indeed a great beauty, but it was not Anne.

In front of the woman was a bottle of Moonlit Night wine, which she was pouring herself from, and the liquid poured out of the bottle was scarlet and scarlet, and the rich aroma of wine wafted out.

'Burgundy hues, almost inhuman beauty, and gorgeous clothes that don't fit in with the whole environment...... It's not going to be ......'

Rosen glanced at it, and his heart shook violently, and a strong sense of foreboding surfaced.