I was engaged in infrastructure construction in the Han Dynasty [Transmigration Book]

Gong Shuchuan and Mo Jiu looked at the drawings and studied for a long time. Gong Shuchuan gestured and said, "There is glass and a long tube. Your Highness, is this a toy?"

After hearing this, Mo Jiu pondered for a while and said, "Isn't it too thick? Look at the marked width... Oh, Your Highness is called diameter, how much is it?"

Gong Shuchuan looked at Mojiu with some puzzlement: "What's wrong with making it wider? Isn't there a thinner place?"

Mo Jiu gave him a deep look and said, "What you said makes sense, but I suggest that it's better to ask His Highness."

Gong Shuchuan nodded, and the two ran to meet Liu Tan together.

After hearing their question, Liu Tan tilted his head and thought for a while and said, "It's not wrong to say it's a toy, but in fact, there are more important uses, so we must make it more detailed."

Mojiu sounds a bit wrong: "More...important uses? Can Your Highness reveal it?"

Liu Tan said: "I'm not sure about this, maybe it will be useful in the military, but it depends on what the father wants, what's the matter?"

Mojiu smiled awkwardly and said, "Really, it's nothing, nothing..."

Seeing his smile, Liu Tan had an intuition that there was something wrong, and asked cautiously: "If you still don't understand, tell me quickly, don't turn around and make mistakes."

Mojiu immediately said: "We need to make a sample before we can know."

Liu Tan glanced at him suspiciously and waved his hand: "Go."

Mo Jiu immediately pulled Gong Shuchuan out of Liu Tan's study, and he let out a sigh of relief after going out, "Fortunately, His Highness didn't find out, otherwise we might be doomed."

Gong Shuchuan was a little surprised: "What's the end?"

Mojiu looked at Gongshuchuan: "Don't you say this thing is a toy?"

What happened to the toy?

Gong Shuchuan understood the meaning of Mojiu before he even asked, and his expression changed immediately: "I mean this might be made by His Highness for His Highness the Seventh Highness to play with. How far do you understand?"

Mo Jiu blinked and looked up at the sky: "That's not important, let's study that lens group first..."

Gongshuchuan: ...

Although Mojiu has a big brain, his knowledge is very solid, but his skills are a little weaker, and Gongshuchuan can complement him perfectly.

The basic knowledge of Gongshuchuan is not bad, but the higher-end ones are almost blank because they have not been touched before, but they are very skillful.

Originally, Gong Shuchuan thought that he was here to help Mojiu and work as a coolie for Mojiu, but he never expected that Mojiu would actually be willing to discuss with him. This already surprised Gongshuchuan.

Mojiu can think about it, and it would definitely not work to ask him to directly bring out all the knowledge of the Mohist family, but what he is talking about now is what Moshi used when he was lecturing in the northern border country, and his family agrees, so it is okay to spread it. nothing.

It is impossible to be reused if you can't figure out the meaning of the king of the north for so long in the country of the north. The king of the north obviously wants to integrate the art of investigating things in the world. If you fight against him, he can kill you.

As for the hatred between the public losers and the Mo family... To be honest, after so many years, the younger generation doesn't feel particularly deeply, not to mention that the Mo family has always been on the side of victory, so the so-called incompetence of the younger generation is more serious. The most important thing is the reluctance of the public loser and the fear of being replaced by the other party.

Now His Royal Highness King of the Northern Territory has first-class skills in water handling, and everyone can see that, either you are honest and rely on this ability to get ahead, or you can get out.

Gongshuchuan and Mojiu worked well together and directly made the simplest monocular.

After Liu Tan got it, he took a look and found that the imaging effect was indeed rough, but it was not impossible to see. Then he waited until night to try to see the stars in the sky, but the result was not much better than the naked eye.

But after all, there is progress, so the next step is the lens group of the objective lens and the eyepiece.

These two things are not easy to study, because the alignment and parfocal of the lens group is a difficulty, and more importantly, how to combine multiple lenses is very troublesome. They can't find a glue that can be used. agent.

So in the end, Liu Tan could only regret to give up the idea of ​​using lens groups to make the telescope smaller, and simply let them zoom in.

After all, the larger the aperture of the telescope, the better the angular resolution, and the angular resolution is the ability to distinguish the minimum distance between two adjacent objects. Simply put, the larger the aperture, the clearer it is.

But even in later generations, it is very difficult to smelt large-diameter lenses. Even if Liu Tan kills the current craftsmen, the diameter of the telescope can only be about two feet at most, and the length has reached three meters.

This finished product is really good, and the stars can be seen clearly, but it is too heavy and too big.

Mojiu and Gongshuchuan are very satisfied. Although their greatest contribution to making this thing is the difficulty they encountered in converting the blueprint into a real thing. This thing is not invented by them, but as long as it is really made, the two of them will One can also leave a record.

Even Liu Tan once said that their names could be engraved on the first finished telescope, which led to the fact that it took the two of them almost half a month to make this telescope like chicken blood.

It's just that the pride of the two of them immediately turned off after seeing Liu Tan's dissatisfied expression. Not only did they not become proud, they even asked cautiously, "Your Highness, what did we do wrong?"

Liu Tan shook his head: "No, it has nothing to do with you, it's because I didn't expect to make it so big."

It’s a burden to use this kind of behemoth when it wants to fight, just like the Sinan Che before, especially what Liu Tan actually wants to make is binoculars, single-lens is like this, how big are the binoculars?Not only is it big and heavy, but the casings of telescopes made today are basically copper-tin alloys. It is not impossible to use iron. The main reason is that the cost of using iron is too high, and the ductility is not as good as copper-tin alloys.

The more important thing is that the telescope is more expensive than the Sinan car-it is easy to break!

The enemy knows it, there is no calculation, and a wave of long-range strikes is directly aimed at this telescope. Wouldn't the two sides be the same if the telescope was abandoned?

The telescope is so heavy that it is basically impossible to move it at will.

Liu Tan circled the telescope and said, "No, it has to be made smaller."

Mo Jiu scratched his head worryingly and said, "But, if His Highness wants to reduce the size of the telescope, he has to reduce the lens as well, then...they may not be able to see far enough."

Liu Tan touched his chin and said, "It's not impossible, just add a prism system."

Mojiu and Gongshuchuan looked at each other, and they both saw confusion in each other's eyes: What is the prism system?

In simple terms, the prism system is to separate the light for focusing, framing, and distance measurement, and to form a tidied image when framing.

Prism systems generally do not cause loss of light energy and simultaneously replace multiple flat mirrors.

Liu Tan didn't intend to let Mo Jiu and Gongshuchuan freely develop this thing. It's not complicated, but it's too tiring to let them do it and explain to them why this is added.

The most important thing is that Liu Tan understands what is involved in it, but the problem is that he can't describe it, or he can't describe it in a particularly precise language. Once there is a mistake in the middle of the description, it will easily lead to misleading.

It's better for him to make something and let the Mohists and the public losers study how to translate it into words written in books, and then he will check it out.

As for the setting of the prism system, Liu Tan used an isosceles right-angled triangle made of two pieces of glass to allow total reflection of the light. Although the light has penetrated many times, it will enter and exit in a normal state, so there will be no Dispersion.

The prism system actually increases the cost of the telescope in disguise. After all, high-transparency glass is too difficult to find. Liu Tan even asked someone to make a crystal telescope for comparison.

The final result is... the two are actually not much different.

However, after adding the prism system, the size of the telescope was indeed reduced a lot, which made Mojiu and Gongshuchuan really confused.

Liu Tan's patience in lecturing is only for Liu Che and Liu Shi, and the rest depends on his mood.

Optics is too complicated, even if he is in a good mood, he doesn't want to talk about it, so he simply writes down the experimental steps of the principle of pinhole imaging and throws it to them, letting them do it for fun.

After Mo Jiu and Gong Shuchuan got the experimental procedure, they were immersed in it, but they didn't bother Liu Tan anymore.

And Liu Tan asked his craftsmen to make a more exquisite binoculars. The surface was painted with a layer of gold, and a circle of small pearls were inlaid on the edge of the lens barrel. The red broken evil gold used, by the way, engraved the number one in the middle of the telescope, and then matched the telescope with a gold chain, the length of the chain can be adjusted, and the two ends are inlaid with pearls.

Frankly speaking, Liu Tan had already spent a lot of money on making the glass used in the telescope, but now that this set of decorations is completed, these things cost more than he spent on smelting the glass.

It's just that vulgarity is elegant, and the aesthetics of the craftsmen who have been making things for the royal family all the year round is still good. Even if so many fancy things are used together, they don't look particularly upstarts, but it makes people feel dazzled at a glance.

The value of the telescope itself is already very high, so the box where the telescope is placed is naturally not bad. Liu Tan directly chose the mahogany box, and he didn't need to customize this one.

Because he would come up with some new gadgets from time to time, Liu Tan had customized a batch of boxes of different sizes and put them in the warehouse. He would take them out when needed. He only needed to decorate the facade to a certain extent. up.

After everything was done, Liu Che took his people to visit the palace in Mount Li.

On the first night there, Liu Tan used the telescope he had made to test it out. Needless to say, he could see the stars more clearly on the mountain.

So after dark the next day, Liu Tan ran to Liu Che's place for dinner, and said cheerfully, "Father, today I will take you to see the stars."

Liu Che:? ? ?