Rosen was taken aback by Savi's reaction.

"What are you doing on your knees? Hurry up! ”

Savi still knelt on the ground motionless, he hugged Rosen's calf tightly and did not let go: "Master, I can only understand a small half of the manuscript you gave me, but I am not blind, this manuscript contains a glorious meaning." This has surpassed the wisdom of mortals, and it is absolutely impossible for me to truly comprehend it with my own mind alone. I beg you, as long as you are willing to accept me as your disciple, I am willing to provide for you for the rest of your life! ”

When he said this, Savi spoke earnestly, his eyes were feverish, and he looked ready to go out and do it desperately.

Hearing Savi's words, looking at his hot eyes, Rosen moved suddenly.

'To truly demonstrate the power of science, it is not enough to rely on the power of individuals. What I can do is to spread wisdom and awaken people's curiosity about the world...... If Saviken learns, why should I be stingy? ’

Thinking like this, Lawson nodded slowly: "I'll stay in Sunderland for a while." In the meantime, I'll at least help you fully master how to make a magic mirror. Of course, at the price, you have to do something for me. ”

Savi was ecstatic, his fat body was trembling uncontrollably, he took a step back on his knees, and his fat body was lying on his knees: "Master, I am very honored to serve you!" ”

"Well, now I want you to do the first thing I did."

"Master, you ...... You say, I'll do my best. Savi was a little apprehensive, for fear that Rosen would make harsh demands.

"I need a piece of about 20 pounds of iron, preferably wrought iron, and if I don't have it, pig iron will do."

Rosen needed to make the parts of the Spiral Troll out of these irons.

Hearing this request, Savi breathed a sigh of relief: "No problem, I'll look for it now." Don't say 20 catties, it's 30 catties, 40 catties is no problem. ”

Isn't it just 20 pounds of iron, it's not simple.

Rosen smiled, took out 50 silver runtes from his pocket and handed them to Savi: "You can use this money to buy iron." ”

Seeing that Savi wanted to refuse, Rosen insisted: "Take it, keep your little money just in case." ”

"Yes, yes, thank you, Master." Savi took the silver ronte, and since he gave Rosen 1,000 silver ronte yesterday, he really didn't have much savings left.

Taking the money, Savi immediately left the glass shop and strode towards the town's blacksmith shop.

Lawson didn't care where Savi would get the pig iron, he unfolded the parchment, picked up the quill, and began to draw the metal parts needed for the spiral troll.

The basic shape of these metal parts, Rosen already had an idea in his head. However, if you only rely on fantasy, it is easy to make errors when you use the power of alchemy to make a configuration, but if you draw a diagram of the specific shape of the part and mark it with the exact size, the impression in your mind will become very vivid, and the concrete molding will become quite accurate.

There weren't many spiral trolls part, no more, no less, exactly 17, and Lawson drew them quickly.

After drawing the basic shape of the part, Rosen suddenly realized that he had a pressing problem that he had not solved.

'Shh~ Oops, I don't have a precision ruler on hand. ’

In the past, it was good to make a single part, but now if you have to assemble 17 parts, if you don't have a ruler, you can't definitely make a part that fits the size, but you will definitely make frequent mistakes, which will consume a lot of extra energy and time.

Soon after, Rosen discovered more problems.

No, not only is there no ruler, not even a standard unit of length. ’

In this world, the measurement of length, mass, time, etc. is very imaccurate, and the standards are not uniform.

For example, the most commonly used units of mass are catties, pounds, langs, and ounces. There are also Parasen pounds, Cowell pounds, Berkeley pounds, and even little Sunderland, which has a 'blackfish pound', which is extremely troublesome to convert to each other.

Then, Rosen found more problems: 'If there are no standard units, the calibration mechanism is outdated.' ’

It is common sense that any unit of measurement, in order to be accurate during propagation, must be calibrated frequently.

However, because of the outdated calibration mechanism, even the same unit of mass can deviate greatly from each other.

For example, when the Parasen Empire collected taxes from various places, it used the Paracen pound. For calibration, the Empire set up 4 stone balls of the same size in four cities, southeast, north, and west. When the stone balls were first built, they were very similar in weight, but after a few years, due to different climates, the stone balls were worn out differently in different places, and as a result, there was a huge difference in the Palathan scales from place to place.

Rosen pondered, 'I'm going to make a spiral troll now, and the parts are not too complicated to assemble.'" If you make other things later, it involves hundreds of thousands of parts, if you don't have a good ruler. When it comes to final assembly, there are definitely a lot of mistakes that make people doubt their lives. ’

No, I don't want to do that, I'll have to figure out the standard units and the method of correcting the error. ’

'Hmm~ Define the most basic and commonly used ...... first. What are they? By the way, there is time, quality, length..... Let me define the time first. ’

Just do it when you think of it.

Rosen thought about it carefully, then opened the parchment and wrote on the paper: "Standard unit of time: seconds, precisely defined...... The frequency of the light emitted by the cesium-133 atom while transitioning at a particular energy level....... Wait, that's fine, but with the current state of the art, it's impossible to measure it..... it, it's so hard. ”

He remembers very well that on Earth, the most standard second is defined by the frequency of light emitted by cesium-133 atoms, which are emitted when they transition between two specific energy levels. Specifically, it seems to be more than 9.1 billion times the photoperiod, which is 1 second.

The problem is that Rosen doesn't have such cesium-133, let alone precise means of measurement, so even if he knows how to define the basic time unit of the earth, it is for nothing.

After struggling for a while, Rosen had to accept the reality: "Forget it, the parts of the spiral troll don't need to be very precise, and I only need to use the unit of length for the time being." Just use the physical definition to define the standard length. ”

With this in mind, he took out the barrel that had been prepared, compared it back and forth, and then wrote on parchment: "Standard unit of length: meter, definition: 1 meter is equal to 2.5 times the length of the barrel of the spiral troll." ”

This is the only definition that Lawson can do, and he can't use other units for the time being, so he can only put them first.

Defining the standard length, Lawson used the barrel as a ruler to calibrate the length of other parts, and things were much simpler.

Half an hour later, Rosen had finished drawing all 17 parts.

After another ten minutes, Savi returned, with a lot of rusty iron tools in his hand, including an iron pot, a hoe, a broken plow, and a discarded axle of a carriage.

"Master, if you can't buy good iron, that's all you have, do you think it's okay?" Savi looked at Rosen uneasily.

He originally wanted to go to the blacksmith shop to buy it, but instead of buying iron, he was scolded by the old blacksmith, and he had no choice but to go to ordinary people to buy iron.

But for ordinary people, these iron tools are valuables, and they are indispensable daily necessities, and they will not be sold easily. In order to buy these iron objects, Savi had to pay a high price.

As a result, after a pass, he not only spent all the money given by Rosen, but also posted more than 40 Rante himself.

Rosen has alchemy in his hands, but he is not picky about the quality of iron, he stepped forward to check it, and found that although these things have a lot of rust, most of them are wrought iron, which is much better than the pig iron used in Savi's hollow iron pipe, he nodded: "You can use it, but I am afraid that the money I give you to buy this iron is not enough, right?" ”

He just doesn't understand the market, but he's not stupid.

In these years, for ordinary people, iron is the most valuable necessity, and good iron can be used as family heirlooms. In today's troubled times, no one will easily sell ironware.

Savi hurriedly said: "It doesn't cost much, as long as you are satisfied, master." ”

Since Savi didn't mention it, Rosen didn't dig deeper.

After thinking for a moment, he said, "Then I'll continue to work." You continue to look at the parchment roll, if you don't understand it, you must ponder it carefully, think about it, if you really can't figure it out, mark it, and when I'm done, I'll explain it carefully to you. ”

"Hey, okay." Savi nodded hurriedly.