The structure of the telescope is very simple, that is, a cylindrical lens barrel and two lenses, after half an hour, Li Longji and the ministers will play the telescope very skillfully, but they do not know anything about the principle and maintenance of the telescope, so they can only ask Li An for advice. Pen & Fun & Pavilion www.biquge.info

"Li Shilang, as far as I can see, this telescope seems to be composed of two medicinal jade lenses and a tube, how can such a simple thing be seen so far?"

Li Longji was surprised, and asked curiously, of course, the ministers also have the same question.

"Your Majesty, the reason why we can see something is because there is light on the surface of such a thing that enters our eyes, and the light can only travel in a straight line, but the medicinal jade mirror can be refracted by some processing, so that more light can be transmitted to our eyes, so that we can see the dark light in the distance, and even feel very similar to us, which is actually the illusion caused by the refraction of light to our eyes, which is also the reason why the telescope can see far away."

Ang Lee explained the basic theory of optics, and of course, he didn't expect Li Longji to understand it.

Sure enough, after Li Longji and the ministers around him listened, they all frowned, with an unclear expression, they had never learned the basic knowledge of optics, so it was naturally impossible to understand the principle explained by Li An, but they felt that the principle explained by Li An was too mysterious, and it was very advanced knowledge.

"Li Shilang's pinyin knowledge, my country's doctors have basically understood, this knowledge of light, can Li Shilang teach my country's doctor of Zijian, so that more people can learn this knowledge."

As soon as Guozijian heard that the light was far away from such a mystery, he immediately asked Li An to give a lecture to Guozijian's doctor, so as to increase Guozijian's knowledge reserve and cultivate more talents for Datang.

"Optical knowledge is not difficult, when I have time, I will go to Guozijian to teach, and when the time comes, not only doctors can listen to lectures, but even schoolchildren can listen to them."

Of course, Li An will not refuse, besides, the knowledge of optics is not very difficult, and at the level of the Tang literati, it should be able to be learned soon.

"Your Majesty, if you want to invent more things that are beneficial to the Tang Dynasty, you must have more talents, not only the outstanding students of Guozijian, but also a large number of practical talents, and what Wechen lacks most now is such talents, which hinders Wechen from inventing more useful and good things."

Li An seized the opportunity to make suggestions to Li Longji and asked for more talents to facilitate his own research and development of various industrial products.

"Practical talents? What kind of talent is this? ”

Li Longji had never heard of this term, and he felt very strange.

"Your Majesty, it is all kinds of skilled talents, such as first-class craftsmen, carpenters, blacksmiths, arithmetic and water conservancy talents, and if these talents are gathered together and guided by Weichen, they will definitely be able to create many miracles and make Datang ten times richer, even a hundred or ten million times stronger."

Ang Lee threw out a huge bait in exchange for Li Longji's full support on the condition of making Datang ten million times richer.

Sure enough, after Li Longji heard this, his expression was very excited, if he could really make the Tang Empire ten million times richer and stronger, what would he not want to pay? In addition, all the ministers are also very supportive, if they can really make Datang many times richer, they are also very happy, don't look at them usually fight for personal interests, but as court officials, they are not confused in the big aspect, everyone hopes that Datang can become more rich and powerful, but at the same time, it is enough not to harm their interests.

"Li Shilang's proposal is very good, I will issue an order, let the supervisor and the Ministry of Industry each transfer thirty percent of the best skilled personnel to Li Shilang, in addition, recruit all kinds of craftsmen with good skills from all over the country to enter the capital, and all give preferential treatment."

Li Longji happily agreed to Ang Lee's proposal, of course, he will continue to discuss many details with the ministers, after all, every time Ang Lee invents something, it is very shocking.

Among them, there are some that can be promoted and learned by foreigners, but there are also some techniques that must not be leaked, such as black powder, which must not be learned by foreigners, and even except for Li An, Li Longji does not want anyone to know the formula of gunpowder.

At present, the technology of Yaoyu is only possessed by Persia, and the blockade technology is also necessary, but it is not so urgent compared to black powder, even if it is leaked out, the damage to Datang is not very huge, and it is a secondary secret technology.

The principle of the telescope is very simple, but it is very important, of course, it must be kept secret, however, the Persian area can also make medicinal jade, as long as they see the telescope and disassemble it for study, it is really very easy to imitate, this technology is relatively difficult to blockade the countries around Persia, it is estimated that it will not be hidden for too long, but as long as the use of the telescope is strictly controlled, it is difficult for Persian merchants to get the telescope, and it is not a problem to hide it for decades.

The technology of the rails cannot be concealed, but other countries do not have black powder mines, even if they can lay the rails, there is absolutely not enough iron, or in other words, their national strength is not comparable to the Tang Empire, and they can't pave the rails at all, and as for the steam locomotive, the technical difficulty is too great, it would be good to be able to build it, and no small country has the ability to imitate it, and the difficulty of secrecy is the minimal.

Being able to get the three manpower of the general supervisor and the Ministry of Works, and he is also the best skilled craftsman, which makes Li An very excited, of course, with this, there must be a lot of Longwu Army soldiers, after all, so many talents, follow Li An to do research, security issues can not be ignored, if the personnel are attacked by assassins, or defect, then, for the Tang Empire, the loss will be too great, Li Longji will never allow this kind of thing to happen.

"Thank you Your Majesty for your trust, however, as soon as there are many talents, the processing workshop near the Weichen Courtyard is too narrow, I am afraid that it cannot be accommodated, and more places are needed to place these practical talents."

Li Ande made every inch, not only asking for talents, but also asking for more land to facilitate research.

"Haha! What's so difficult about this, Li Shilang's annex is five miles away from the Black Powder Workshop, and the five-mile section in between is all assigned to Li Shilang, what needs to be built, Li Shilang can directly discuss with the officials of the Ministry of Industry, and I fully support Li Shilang. ”

Li Longji very boldly agreed to Li An's request, for the prosperity of the Tang Empire, of course he will not be stingy with some land, and the land near the capital is all under his nose, now with a telescope, Li Longji only needs to stand on the highest building in the palace, and he can directly conduct remote inspections of the workshops outside the city.

"Your Majesty Xie, Weichen will redouble his efforts to develop more good things for Datang that benefit the country and the people, and make Datang ten million times richer."

Ang Lee's excited statement made Li Longji and his ministers seem to see the future, and Datang will be ten million times richer.

"Li Shilang, this telescope is very important, you must strictly restrict it, you can't let it circulate among the people at will, all the telescopes made will be handed over to the imperial court, and I will distribute them to the border army, in addition, the imperial court also needs some to observe the celestial phenomena."

Of course, Li Longji can't let ordinary people have telescopes, in that way, the technology of telescopes will be easily spread, in addition, there are many mountains around the capital, if ordinary people stand on the high mountains, wouldn't it be easy to see the situation in the Daming Palace, in this way, what privacy does the palace have, this is absolutely intolerable to Li Longji.

"Wechen understands that in addition to being used for research, Wechen will customize the telescopes needed according to the needs of the imperial court, and will never let a large number of telescopes flow into the people."

Li An opened his mouth to assure Li Longji at ease.

"By the way, Li Shilang, how should this telescope be maintained, is it easy to break?"

Li Longji is very concerned about the availability of the telescope, after all, this thing was made by Li An, and only Li An knows best how to maintain it.

"Your Majesty, the telescope is made of medicinal jade, the biggest problem is fragile, so, the most afraid of falling, in addition, if there is water inside, it will also seriously affect the observation effect, so, can not be immersed in water, usually the lens is dirty, you can wipe it with soft silk, you must not wipe it with your hands, because there is sweat on your hands, you can't wipe it well, and it will damage the lens."

Ang Lee introduced very professionally, obviously, when it comes to how to maintain the telescope, Ang Lee is an absolute expert, and no one will doubt this.

"By the way, Your Majesty, there is another taboo in the telescope, that is, you can't observe at a strong light source, that is, daylight, otherwise, it will burn your eyes and even make your eyes blind."

Li An suddenly thought of a very important point, about this point, later generations did a lot of experiments, put a pig's eye in the eyepiece of the telescope, and turned the eyepiece to the sun, the result was that in a short period of time, the pig's eye was burned through, and the effect was quite scary.

When Li Longji and the ministers heard this, they nodded again and again, and quickly thought of the reason, after all, when the sun is directly observed, it is already very uncomfortable for the eyes, if the sun is pulled closer dozens of times, the intensity of the light can be imagined.

"Li Shilang, if you use a telescope to observe the full moon, is it okay?"

A minister asked curiously.

"It's no problem to observe the full moon and the starry sky, and besides, when you zoom in dozens of times, you can see things that you can't normally see, which is very interesting, right?"

Ang Lee replied with a smile.

"Li Shilang must have seen the starry sky with a telescope, I wonder if there is a fairy Chang'e on the moon?"

One of the ministers asked with a smile, obviously, he also thought it was unlikely, after all, these were just legends, how could they be taken seriously?

"Fairy Chang'e? Maybe! Tonight is the full moon, and you will know if you look at it. ”

Ang Lee didn't answer positively, and sold it directly.

Of course, Li Longji is also curious about what is on the moon, whether there is really the legendary Guanghan Palace, as well as Chang'e and Jade Rabbit.

"Haha! Li Shilang's proposal is very good, tonight, I decided to watch the stars here, you Aiqing can enter the palace together, observe with me, Li Shilang stay, retire from the court. ”

Li Longji is very much looking forward to what is on the moon, of course, he will not miss the excellent observation opportunity of the full moon, and the civil and military forces of the Manchu Dynasty are also very curious, so letting these courtiers see what is on the moon with their own eyes is also a kind of closeness to the courtiers, which is more beneficial to maintaining the rule.

The ministers reluctantly handed over the telescopes and left slowly, after all, Li Longji did not say who he wanted to give these telescopes to, so naturally these ministers could not take any of the telescopes with them.

Li Longji left Li An alone, needless to say, of course, there are many things that he has not understood, and if the ministers ask one by one when they are there, first, there is a risk of leaking secrets, and second, they will expose their ignorance as an emperor, thereby reducing their own prestige, and asking some things alone, of course, these problems do not exist.

Li An answered all kinds of questions raised by Li Longji with half of the truth, after all, there are some questions that Li An can't answer truthfully, such as bizarre things like traveling through time, he can't explain it to Li Longji at all, and he can only lie about all kinds of knowledge he has.

Fortunately, Ang Lee's lying skills are very skillful, and Li Longji can't be sure why Ang Lee has such a smart mind, so he can only believe what Ang Lee says.

Although Li Longji agreed to Ang Lee's need for a large number of talents to conduct various researches, he had to ask clearly about the specific research and development directions, as well as the funds and resources needed, so as not to do things that were unfavorable to the Tang Empire, or beyond the tolerance of the Tang Dynasty's national strength.

For the various R&D products that Datang urgently needs, Li Anxin has imagined many times in his heart, and naturally understands what needs to be developed most and what the success rate is.

Of course, research and development takes time, especially the most complex steam engine, it takes a lot of time to test and verify, and the resources required are also very much, and once it succeeds, it will bring earth-shaking changes to the Tang Empire.

In this way, the Tang Empire can put its superior troops and horses from all directions into one direction in a very short period of time, so as to achieve local strategic advantages and quickly defeat its opponents.

In this way, all the countries around Datang will no longer have the ability to challenge the authority of the Datang Empire, or take advantage of the opportunity of Datang to attack in one direction and make trouble for Datang from behind.

Li Longji made up his mind that no matter how huge manpower and material resources he expended, he must also develop a steam locomotive, so as to completely change the threats faced by the Tang Empire in many directions, which made Li An more confident and did whatever it took to get the steam locomotive. (To be continued.) )