Indeed, as Wei Yuan thought, a circle has a circle of life. Pen? Interesting? Pavilion wWw. ｂiquge。 ｉｎfo

Jumping out of this circle, sometimes it is difficult to understand people in another circle, and even harder to understand why those people would put their whole life's work on meaningless things.

For example, what is the use of knowing that two parallel lines cannot intersect? Can you be an official or can you make a fortune?

For example, what is the use of spending a lifetime calculating sine and cosine tangent cotangent at various angles? Can I eat enough or can I dress warmly?

For example, what is the use of writing a book all your life just to prove that a line or an angle or a circle is written?

For example, there are debates about the difference between mass and weight, about what light is, about latitude and longitude, about whether a new substance extracted from a purple kelp is indivisible or divisible......

All of this, to be precise, for a long time, some things were useless at all.

But over time, these seemingly useless things gradually become useful.

It's like a weird curve that, when it reaches a certain value, is almost straight and looks powerless.

However, once that value is crossed, the curve bursts into an awe-inspiring array of wealth over a hundred years of terrifying power over centuries or even millennia.

It's just that the process is long and requires a most dangerous path.

If this road can be crossed quickly, then scientific arithmetic will become a fashion and people can really feel the power of it.

If you can't get over, then these things will be suppressed by more realistic things, and eventually they will be deformed to the point of ignorance, and it will be difficult to move an inch, because in a way this thing is really useless.

The small hole imaging is meaningless in the Warring States disputes.

The world is moving, and it is meaningless to compete for domination of the world.

Even gravity is meaningless to some extent.

But these meaningless things accumulate and when they are put together one day, they seem to become meaningful in an instant.

It's just that no one can say exactly where this threshold is, even after a hundred and fifty years in the normal world line, craftsmen who have learned by apprentices can still beat scientists in some places.

Chen Jian didn't know where this threshold was, so he could only go sideways.

In this era, there is no difference between craftsmen and scientists, so Chen Jian wants to do chemistry and biology.

These two things started from scratch and started with the foundation of the descriptive discipline at the beginning, so they can go very fast.

As Mr. Mu said, just as many seniors in the discipline spent their efforts on alchemy to prove that they were useful, Chen Jian also had to spend time proving that these disciplines that were classified as science were useful and could make money.

He even did not hesitate to take the evil path of worshipping reason and Scientology.

In Mincheng, in the Xue Palace, Chen Jian shouted the slogan: Reason can explain everything, and only by explaining everything can we follow the way, so rational science is money and power.

For this sentence, and for the various experiments that Chen Jian did in the capital, Mr. Xuegong or some naturalists and celebrities in the circle who received his invitation came to Mincheng to participate in this strange "First Scientific Seminar on Chemical Alkali Fund".

These words were not shouted to these people who were invited to Mincheng, if even these people didn't believe it, then it was useless for him to shout.

These words are shouted to those who are eager to get rich, to contribute to this community, to change, to rule the world, and to all the people of the country.

In Mincheng, Jian Chen proved that the gentlemen of the school palace could make a lot of money, and that when they mastered the knowledge, they could exchange this knowledge for silver coins that people liked.

This has been proved by those workshops, at least in Mincheng caused some waves, and extinguished the signs of high knowledge and uselessness of life.

But in a wider area outside of Mincheng, Chen Jian can only attract people's interest with things like circus performances, such as prisms, center of gravity wheels, and telescopes.

Just like the widely circulated rumor that Huaxia invented gunpowder only to make fireworks, Chen Jian felt that in order to let more people get in touch with these mysterious things, sometimes it was really necessary to rely on some so-called "strange tricks" to attract people.

In order to let these so-called "strange tricks and tricks" generate some huge trends in the entire ethnic group, Chen Jian also prepared a piece of "strange tricks and tricks" that can be popular all over the country for the gentlemen of the school palace invited this time, and hopes to rely on them to promote it.

Science is not just used to make guns, people hate science when they come into contact with guns, and if you want people to like it, you have to be everywhere in daily life.

In mid-April, the first scientific seminar of the Chemical Alkali Fund was successfully concluded.

Before the end, Jian Chen proposed to leave everyone a picture scroll that can be remembered forever.

Everyone who heard the news frowned.

They thought it was Chen Jian who wanted to ask a painter to paint their portraits, which was a tiring task.

Not only for the artist, but also for these people, the person who enters the painting needs to endure the torture of being motionless for a long time, which is a great test of patience for some people.

This meeting was perfect, solved a lot of problems, and everyone had a very pleasant exchange, so that all the participants in the meeting had a great improvement in knowledge.

Therefore, Chen Jian, who couldn't bear to refuse, had no choice but to agree.

Jian Chen asked someone to bring chairs and let everyone sit down first, while he got into a dark tent that had been prepared and smeared with asphalt on the outside.

In the tent, relying on the faint light source, Jian Chen was busy preparing his tricks.

Since everyone is asked to sit in a row, of course, it is not to eat the fruit, but to leave a photo. This was something that Jian Chen had planned when he was in the capital.

It is not only for the commemoration of this time, but also for these gentlemen and highly famous figures to spread this kind of photography method freely and quickly, triggering a wave of scientific enthusiasm.

Lead glass, mirror grinding, strong acid, silver solution, cotton, paper...... The pre-preparation for primitive photography is already done and only needs to be put together in a specific way.

He has nitric acid, and he also has absorbent cotton with impurities, so he can make cotton wool.

The correct use of this cotton wool is to continue to improve it to make explosives, but it is used to do some tricks, after all, the new era is not made by musket explosives, and the changes brought about by science should not be only in the military, but should be quickly close to life, so as to arouse the enthusiasm of more people.

The weak cotton is easily mixed with ether and alcohol, which has been used as an anesthetic experimented in the capital, and the cotton wool is quickly dissolved in it, forming a gelatinous substance or glue.

The glue is mixed with some silver nitrate and ammonium chloride solution, this collodion glue is applied to the glass, the glass is placed at an angle, and the slimy glue is formed into a film on the glass by gravity.

When this layer of film is no longer flowing down, it is quickly loaded into the camera obsca that the master carpenter has already made.

In front of the camera obscura, there is a crescent-shaped lens sharpened by the mirror grinder, and a layer of black cloth shines on the front to prevent light transmission.

Because there was no magnification technology at this time, this "camera" had to do a lot to be able to shoot more people.

The glass film mixed with silver chloride has good photosensitivity before drying, and the negative sheet formed on the left and right inverted on this layer of glass cotton film after passing through the lens.

The ferrous sulfate solution for development and the baking soda solution for fixing have also been prepared for a long time.

None of this can be prepared in advance, and the wool glass film has no photosensitivity after drying, so it can only be prepared in the tent now.

Chen Jian also prepared a lot of photographic paper for "copying" negatives, the principle is similar to photography, and it is also soaked in the paper with photosensitive silver halide, and when it is necessary to "copy", the negative and photosensitive paper are put together and exposed to the sun.

Because the negative film is already upside down, the negative is positive, and the photo obtained on the photosensitive paper is normal.

The principle is nothing more than that the place where the negative film has been photosensitive will block the light, and because the negative film is no longer sensitive after fixing, and the new photosensitive paper can be sensitive, it is equivalent to re-taking the photo, but the object of the photograph is no longer the real thing but the negative.

The theory is not profound, that is, the photosensitivity of silver halide is used, so the bottles containing silver chloride or silver nitrate are all brown glass bottles. Not only silver halide, but also asphalt, but the photos taken are not eye-catching.

The "photo paper" used to make photos is the thinnest white paper you have ever bought. In order to reduce the effect of paper fibers, Chen Jian used egg white, a mixed solution of egg white, salt, vinegar and water for a period of time, and immersed the paper in the egg white solution.

Subsequently, a brush was used to dip some silver nitrate solution and apply it to the paper soaked with egg white, which also produced silver chloride, which can be photosensitized.

All the materials in this set are available now.

It is useless for war, and it can even be said that it is useless for people's livelihood, but it is the easiest to promote and make people quickly marvel at the power of science.

For a more perfect photo, you can use silver iodide or silver bromide, but the principle is the same. Besides, you don't have to be perfect to do everything, and sometimes even if it's not as good as it can be, it can have unexpected results.

This photographic technique is dangerous, the silver salts are poisonous, the ether has an anesthetic effect, and it evaporates quickly after being applied, and the slightest spark is an explosion or fire.

But now under these conditions, only Chen Jian himself wears a mask to prepare these things.

When everything was ready, put the glass wool lens into the camera obscura, make sure the lens cap of the camera was not opened, and call a person to work together to lift the bulky "camera" outside.

Locating everyone's position from the observation hole installed next to him, Jian Chen hurriedly ran to the seat that everyone left for him.

It takes a long time to be exposed, so it is impossible to drain a smile, and this primitive photographic photo shows that everyone's face is extremely serious.

In addition to seriousness, there may be a hint of exhaustion, after all, no one can keep smiling for twenty minutes, and then the mouth will cramp.

Everyone looked curiously at the large and bulky wooden box in front of them, and asked Jian Chen strangely, where is the painter?

"Science is the artist."