Li Ang only took half a day in the afternoon to teach the emperor's grandsons, that is, one or two hours, and walked around the R&D center in the morning, giving casual guidance, and there was nothing to do.

At this moment, the sun has not yet set, but Ang Lee has already gone home from work, resting for a while and having dinner, and the time of the day has passed.

However, a life that is too boring is too boring, and a life of struggle is more meaningful, so Ang Lee will not be too idle, he will use the time to sleep at night, think about the next research and development plan, and continue to conceive and modify until he is completely satisfied.

The research and development of dry batteries was not difficult, and after Ang Lee gave the drawings and data, those under his command quickly manufactured the various parts and assembled them together to make a rudimentary dry battery model.

"It's only been five or six days, and it's not easy to do so well! Come and give it a try! ”

Ang Lee was very satisfied with the manufactured battery model, and then took out the circuit model in the drawer, in fact, that is, a few sections of wires and switches, as well as a small bulb and lamp holder, are very common items in the laboratory of later generations.

The length of the power base is fixed, however, the negative pole is a small spring, which has a certain elasticity, so even if the length of the battery manufactured is somewhat deviated, it does not matter much, and the normal use of the battery can be guaranteed.

Li An first put the negative pole of the battery on the spring side of the power base, and then snapped the battery into the battery holder with a force, only to hear a crisp click, and the battery was completely stuck in place.

All the R&D personnel responsible for manufacturing battery prototypes were very curious to see everything in front of them, and they couldn't believe that putting these strange things together could release the light.

"That's it, it's time to witness the miracle."

Li An gently closed the switch, and suddenly, a miracle really appeared, the small light bulb lit up, it flashed at first, and after waiting for a while, it stopped flashing, and it was always so on.

"It's on, eh, it's really on, the battery has been successful, it's successful."

"Li Shilang is really a god, just using these things, he can make things that can generate electricity, it's amazing."

"Li Shilang, can this keep the light bulb on? How long can it last! ”

After everyone saw the small light bulb turned on, they were very excited and asked nonsense.

Li An actually doesn't know how long such a battery can make the small bulb bright, but this can be verified by experiments, so he smiled and said: "The power of this battery is very limited, as for how long the small bulb can be lit, I don't know very well, this has to be verified by experiments, okay, let this small bulb keep it on!" Let's see how long it stays on! ”

Since it is not clear about the power of the battery, it can only be verified by experiments, at least to figure out how long such a battery can be used, if it can be used for too short a time, then there is not much use value, after all, the battery use time is a very important indicator, the longer it can be used, the better the performance of the battery, if it can only be used for a short time, the actual value of the battery will be greatly reduced.

For example, after five minutes of use, the battery is dead, so it is not necessary to keep changing the battery, and it is annoying to death without being tired, but if it can be used all the time, it would be great.

The role of the battery is very large, the simplest role is to provide reliable consumables for the manufacture of flashlights, if the flashlight does not have batteries, it is no different from waste.

And when walking at night in the dark, there is nothing more practical than a flashlight, with a flashlight you can see the dark night road clearly, which is much stronger than walking with a torch, safer and pollution-free.

Now that the dry batteries have been made, get a flashlight, it is pediatric, and it can be made in minutes, and large-scale production is no longer a problem.

Compared with the production of batteries, the difficulty of producing flashlight housings is much simpler, and it is easy to finalize and produce.

After the success of the battery experiment, Ang Lee was happy to make a detailed design of the production line for the battery, and asked everyone to be responsible for putting the dry battery into production as soon as possible.

In order to increase production and reduce costs as much as possible, the dry batteries to be produced by Ang Lee are all unified models, the materials and sizes are exactly the same, there is no difference, if you make a lot of models, it is estimated that it will be a lot of trouble, and the machine alone needs many kinds, which is too troublesome.

After assigning the task of mass production of batteries, Li An immediately wrote a report and declared it to the imperial court, after all, the commissioning of any scientific research project must have the support of the imperial court.

And as long as Li An said that this was very important, those minor officials in the imperial court naturally did not dare to stop it, and they must seriously complete Li An's explanation and handle the matter properly.

Li An's most urgent thing is the telegraph and the telephone, which are set by the imperial court as the Wanli Transsonic Plan, and the battery is part of the Wanli Transsonic Plan, so as long as the officials of the imperial court see Li An write something under the Wanli Transsonic Plan, they attach great importance to it, and they no longer dare to have the slightest objection.

Of course, such an important plan naturally cannot be hidden, since Li An told Li Longji about this plan and received his strong support, this plan has been filed in the imperial court.

And the officials of the imperial court naturally couldn't help but tell their trusted acquaintances, so that the coming and going would be spread out, and finally let the people of the entire capital know.

Since the matter has been leaked, there is no need to keep it secret, after obtaining the consent of the imperial court, Datang Daily deliberately went to interview Li An and asked the details of the Wanli Transsonic Plan in detail, however, Li An would tell others the most critical things, just tell the people of Datang Daily that after the Wanli Transsion Plan is completed, a person can directly talk to people thousands of miles away easily.

This news is definitely a big explosive news, and after it was published in the authoritative Datang Daily, it soon became the talk of the people on the streets.

As soon as many people meet, the topic they must talk about is Datang's Wanli Transmission Plan, and ordinary people can only talk about it casually, but many nobles and officials are thinking about the great convenience that this plan will bring to the imperial court after it is completed.

Even many people have begun to think about getting a set of such equipment for themselves, so that in the future, they don't need to be so troublesome to communicate with people in the distance, just talk directly, and don't be too aspect.

All ordinary people can do is to look forward to it, and very much hope that Ang Lee can complete this plan, the sooner the better, and many powerful people have taken various methods to explore the latest news, hoping to understand the details of this plan, as well as the progress.

However, Ang Lee is in the process of researching, so for anyone who tries to come to investigate the progress, he will not tell the truth, and he will definitely not tell the truth in order to cater to them, and the people under his command will not leak secrets, they are just mechanically completing the tasks assigned by Ang Lee, as for what the finished product of the Wanli Transsonic Project is, they are completely unclear, so many people who try to find out from Ang Lee's side are all disappointed.

In other words, except for Ang Lee, no one in the entire Datang Dynasty knows what the finished product to be produced by the Wanli Transsion Project is, what it looks like, how big it is, and how it is realized.

And people are so strange, the more they don't understand something, the more they want to understand, which is called curiosity.

People are curious animals, and they always want to know about things they don't understand, and the more they can't understand, the more they can stimulate people's curiosity.

Of course, there are also many people who think that Ang Lee may be bragging, the two of them are separated by a hundred steps, and they can't hear clearly, and they are thousands of miles away, how can it be like a face-to-face conversation? It's a bit of, so they can't believe it.

And the people who support Ang Lee also gave a very reasonable explanation, that is, the objects such as glass, trains and artillery that Ang Lee made before, which is not a shocking good thing, why is it fake when it comes to Wanli Transmission, since Ang Lee can build a railway to make ordinary people's travel hundreds of times easier, so why can't he come up with the technology of Wanli Sound Transmission?

In short, a huge war of words broke out between the supporters and the opposition, and people with high status would choose to express their views in the Datang Daily and refute the other party's views, while ordinary people could only argue face-to-face.

However, this is a good opportunity for gamblers, many people in order to prove that they are right, do not hesitate to bet a large amount of their property, if they end up guessing wrong, it will be a huge loss.

Of course, since it is a bet, there is naturally a time limit, if there is no time limit, what if the invention is successful fifty years later, the person who bets at that time has already become a handful of loess.

The time for which these gamblers bet is different, some bet for a period of one year, some for half a year, two years, or any kind of time.

If Li An knew that these gamblers actually acted like this, he would still spit out a mouthful of old blood angrily.

After the battery was developed, the assembly line for mass production is still under construction, but small batches of laboratory batteries have been manufactured, about dozens! It was enough for Ang Lee to use for experiments.

After having the battery, in addition to some of the batteries used to check the power of the batteries, the remaining batteries are ready to be used for the flashlight that will be built later.

Because the difficulty of manufacturing a flashlight is too simple, after the battery was developed, the flashlight was also made.

However, in order to save materials as much as possible, the flashlight that Li Ang first built was transformed from a bamboo tube, only a small glass sheet and reflective metal sheet were added to the front, which was very cost-saving.

There is no thread structure at the tail, which is directly pressed with another bamboo tube, of course, the contact between the tail metal sheet and the main body must be considered, otherwise, the circuit will not work.

The cost of such a flashlight is very low, ordinary people can make it themselves, if you want to further reduce the cost, you can also omit the glass piece in the front, so that it is even cheaper, after all, the glass at this time is a monopoly operated by Li An, and the price is really not cheap.

Of course, such a garbage configuration belongs to the civilian level, if it is used for the patrol of the imperial court soldiers and the use of aristocratic families at night, then it cannot be so fooled, and it must be made of fine products.

A good flashlight material should be strong, for example, you can use all copper materials, and even use gold and silver materials, such as the flashlight for the emperor, of course, it can't be steel, it's not impossible to get a gold material, and it has to be carved with a real dragon?

Ordinary aristocratic families can also afford to use silver flashlights, which can also be carved with some patterns, and copper flashlights can also be made.

Because the battery has not yet been mass-produced, the demand for ordinary flashlights is not so large, so Li An is not in a hurry to engage in assembly lines, but just let craftsmen make some particularly precious flashlights, ready to give them to the most noble group of people in the Tang Empire, which can be regarded as a gift to them, and at the same time let them feel something, whether such an artifact is suitable for large-scale popularization, as long as the emperor and nobles feel that flashlights are good things and should be produced on a large scale, then it is very easy to make an assembly line. The whole court will unanimously agree.

This can be regarded as a small ploy by Ang Lee! Use this method to find a suitable reason for the large-scale production of flashlights, after all, the manpower and material resources of the Tang Dynasty are limited, if it is not particularly needed, the imperial court will not agree to the large-scale production of the same item, otherwise, any thing will be produced on a large scale, where will the labor force of the Tang Dynasty be enough, and the national resources will not be able to bear it, and as long as the high-level nobles recognize this invention and think that it is worth promoting on a large scale, then there is no problem.

High-end flashlights are still being manufactured, at this moment, Li An only has a very ordinary bamboo torch in his hand, and it is almost time to teach the emperors and grandchildren, Li An's next lesson is about the reflection of light, these flashlights just have a place to use, no longer need to use bulky spotlights, and there is no need to connect the current so troublesomely.

Since you don't need the color of the light to study the reflection, you don't need to improve the flashlight, you just need to bring one, and in addition, you need to bring a mirror.

The mirror doesn't need to be very big, it's enough to be bigger than the bowl, and by the way, you need to bring a whiteboard, so that the light reflection experiment, even if all the instruments needed are in place, you can do the experiment happily.