Yang Cong was stimulated by the Ming Dynasty version of the car or hand-held tractor invented by several peasants, and finally realized that he was the biggest "inventor" of this era. There were countless things praising the times in his mind. It was a pity that he didn't "invent" it.

So, what should I invent?

First of all, this thing must be useful, and the more useful the better.

There are so many things he can "invent". It can be said that he can't even count them himself. If it's useless, then what should he do to invent it? Is he entertained himself? He is not that idle yet.

For example, if a child’s toys are willing, not to mention a few, even dozens or even hundreds of them can be "invented".

However, how meaningful is it to invent it? At least, it has little meaning to the current Ming Dynasty.

His time is precious, and he cannot be wasted on these meaningless things.

Then, this thing must be simple, and the simpler the better. If something too complicated, it will take several years or even more than ten years, then it will be even less meaningless.

He is not like Jiajing, who fantasized about his life being able to live forever. He only had decades in his life, and his time was very limited. How to use this time? "Inventing and creating" more practical things is serious.

For example, is that good thing for computers and mobile phones that are common in later generations?

There is no need to ask this question, it is definitely very good. The key is that the thing is too complicated, and even Yang Cong doesn't understand it very much.

If you want to invent it, the process will be unimaginable.

Now there is no electricity, from inventing electricity, to inventing generators, to inventing electronic components, to inventing various chips, to inventing software...

This process is so long that it is desperate that it doesn't have to think about it even lasts for dozens or hundreds of years.

Naturally, Yang Cong would not consider these out of reach. What he is going to do now is that simple and practical thing.

At the beginning, he thought about using the steam engine to invent some useful machinery.

However, after thinking for a long time, he had no choice but to find that he seemed to know about simple and practical machinery, and he had almost invented other machinery, and he did not understand the children of the craftsmen. It would be easier to figure out if others thought about it than him.

There is no need to think about this steam machine, so what simple and practical things are there?

He racked his brains and thought for a long time, and finally thought of something. This thing is not widely used in later generations, but it is quite practical at this time, and it is so large that it is simply unimaginable.

This thing is a telescope!

Telescopes have been one of the essential equipment for battlefield commanders for a long time, but after the satellite appeared, they seemed to be gradually eliminated.

Before the satellite appeared, telescope was a necessary magic weapon on the battlefield.

Of course, this artifact is intended to be based on the premise that you have enemies but not.

If everyone has it, it is not a magical tool, but a regular equipment.

At this time, there is no such thing as a telescope in the world. If it can be made, it will definitely be a magic weapon on the battlefield. It is said that knowing yourself and your enemy will never be defeated. When the enemy still can't figure out your reality, you have already seen the enemy clearly. It is difficult to lose in this battle.

Now that there is glass, can't the telescope be made?

To put it bluntly, the two concave mirrors are just overlapping each other. As for how to stack them, whether they use concave mirrors or convex mirrors, these are not problems. Anyway, you will know if you try it. The most important thing is that the surface of the concave mirror must be smooth when processed. If it is rough and cannot be seen clearly, it will be useless.

Can the concave and convex mirrors be processed more mirror-smooth?

This problem seems to be no problem, because at this moment, many gold, silver and jade have very smooth surfaces, and even bronze mirrors are smooth enough to reflect human figures.

In other words, the craftsmen of this era have their own unique methods to make the surface of the processed things smooth like a mirror. There is no need to doubt this, but I just don’t know if this kind of person is easy to find.

When Yang Cong thought of the role of the telescope on the battlefield, his enthusiasm came up. He immediately ordered someone to invite Wang Xuan. The two met and said a few politely, he couldn't wait to ask: "Sir, do you have any craftsmen who are working with gold, silver, jade or bronze mirrors among your students?"

When Wang Xuan heard this, he couldn't help but curiously said, "What, do you want to make jewelry? This is simple. Just send the materials to the capital. What jewelry can't be processed?"

Yang Cong quickly explained: "No, no, sir, I want to process something. The surface of this thing must be very smooth and there are no flaws at all, just like the surface of a gold, silver, jade or bronze mirror."

It turned out to be this. Wang Xuan nodded quickly and said, "Although there are not many craftsmen who process gold, silver, jade and bronze mirrors, most of them are concentrated around the capital. There are still so many craftsmen among my disciples. What do you want to process?"

Yang Cong thought for a while, then shook his head and said, "This is not clear for a while. Just have such a person. You can order someone to inform them to go to the smelting school. Let's go, we will go, and we will meet there."

What does this kid want to do?

Although Wang Xuan was a little curious, he did not ask in detail, because Yang Cong often made some inexplicable actions, even if you asked, you would not be able to ask clearly. Once you did it, you would suddenly realize it. He was used to it, so he simply stopped asking.

The two of them soon arrived at the Metallurgical Academy, and at this time several of Wang Xuan's disciples were already waiting there.

Yang Cong didn't say much, and immediately took them to the glass-making workshop and ordered people to pick up the pen, ink, paper and ink, and gesture on the spot.

He didn't say anything about the telescope, just roughly drew the concave mirror, set the size, and asked someone to open the mold and do it immediately.

The glass processing is different from later generations. The glass processed in later generations is made by the boss piece by piece. If you want to make doors and windows, you have to use a glass knife to scratch it piece by piece. However, there are no glass knives at this moment. Yang Cong is too lazy to ask someone to find diamonds to make glass knives, but he directly makes abrasive tools. All the sizes of doors and windows are determined to be suffocated. You can install them directly after making them, and you don’t need to scratch them at all.

Therefore, the glass-fired workshop now has materials for making abrasive tools, and the size required is quite small, which is one inch and two inches in diameter. The concave mirror and convex mirror are the same. There are four molds in total, so it is naturally not difficult to make.

The mold was made quickly, and the glass water was ready-made, so the lenses of the concave and convex mirrors were naturally processed quickly.

However, the surface of the abrasive tool is not that smooth, and the lenses made cannot be used as lenses for telescopes.

Yang Cong took the mao's concave and convex lenses and said to the disciples: "This is what I want you to process. You can think of a way to polish both sides of it, so as to be smooth like a bronze mirror, without any flaws."

They naturally knew about this task. As soon as Yang Cong said, they nodded and took the lenses and went to work hard.

Immediately afterwards, Yang Cong asked Wang Xuan to find several craftsmen and used copper to create several monocular tubes, which were large and small, and the two ends were closely combined and could slide back and forth.

These things are not very difficult to process. The next morning, Wang Xuan brought his disciples with his processed lenses and lens barrels.

Yang Cong took the processed lens and roughly tested it and found out that the small one should use concave lenses, and the large one should use convex lenses. The two lenses are combined together and then slowly adjust the focal length to see clearly the things in the distance.

This guy, Wang Xuan, first watched Yang Cong fiddle with the lens and the lens barrel, but he didn't know what Yang Cong was going to do. When Yang Cong put the adjusted telescope into his hand and explained a few simple words, he was stunned.
Chapter completed!