From Chief to Ball

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

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

It is not only for the commemoration of this time, but also for these academics and high-profile figures to quickly spread this kind of photography free of charge, triggering a wave of scientific upsurge.

Lead glass, mirror grinding, strong acid, silver solution, cotton, paper... The preliminary preparations for primitive photography have been completed, and only need to be combined in a specific way.

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

The correct use of this gun cotton is to continue to improve it to make explosives, but it is used to make some strange tricks. After all, the new era cannot be exploded by musket explosives. The changes brought about by science should not only be in the military On the contrary, it should be close to life quickly so as to arouse more people's enthusiasm.

Dissolve the produced weak cotton in the mixture of ether and alcohol used as an anesthetic that has been experimented in the capital, and the gun cotton will quickly dissolve in it to form a jelly or glue.

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

When this layer of film no longer flows down, quickly put it into the dark box that the master carpenter has already made.

In front of the camera obscura, there is a crescent-shaped lens ground by a mirror grinder, and a layer of black cloth is used to prevent light from passing through the front.

Because there was no magnification technology at this time, this "camera" had to be made very large in order to be able to capture more people.

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

The ferrous sulfate solution for developing and the soda solution for fixing have also been prepared long ago.

All of this cannot be prepared in advance. The collodion glass film has no photosensitivity after drying, so it can only be prepared in the tent now.

Chen Jian also prepared a lot of photo paper for "copying" the negative film. The principle is similar to that of photography. It also uses photosensitive silver halide soaked on the paper. When "copying" is required, the negative film and photosensitive paper are combined. Put it in the sun to dry.

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

The principle is nothing more than that the light-sensitive part of the negative film will block the light, and because the negative film will no longer be sensitive to light after fixing, and the new photosensitive paper can be sensitive to light, which is equivalent to taking a new photo, except that the object of the photo is no longer the real object but the negative film.

The theory is not profound, but the photosensitivity of silver halide is used, so the bottles containing silver chloride or silver nitrate are all brown glass bottles.Not just silver halide, but asphalt too, but the resulting pictures are unsightly.

The "photo paper" used to make photos is the thinnest white paper you can buy.In order to reduce the influence of paper fibers, Chen Jian used egg whites, put the mixed solution of egg whites, salt, vinegar and water for a period of time, and immersed the paper in the egg white solution.

Then dip some silver nitrate solution with a brush and smear it on the paper soaked with egg white, which also produces photosensitive silver chloride.

All the materials in this set can be collected now.

It is useless in war, and it can even be said that it is useless in people's livelihood, but it is the most easy to spread out, which makes 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, not everything needs to be perfect to do it, and sometimes even unsatisfactory ones can have unexpected effects.

This photographic technique is very dangerous. The silver salt is poisonous, and the ether has an anesthetic effect. After the gun cotton is applied, it evaporates quickly. A little spark can cause an explosion or a big fire.

But now under these conditions, only Chen Jian can prepare these things by wearing a mask.

After everything was ready, put the glass collodion photosensitive film into the "camera" obscura, make sure that the camera's lens cover was not opened, and asked a person to work together to lift this bulky "camera" outside.

After locating the positions of the people from the observation hole installed next to him, Chen Jian hurriedly ran to the seats reserved for him by the people.

The exposure time takes a long time, so it is impossible to emit a smile. Everyone's face in this original photography photo is extremely serious.

In addition to seriousness, there may be a trace of fatigue, after all, no one can keep smiling for 10 minutes, and the mouth will cramp like that.

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

"Science is the painter."

Chapter 131 Deceiving the World

When Chen Jian answered like this, everyone was frightened, wondering what weird thing Chen Jian had come up with again.

Everyone has heard Chen Jian say the same sentence many times.

When seeing the glass model of the reciprocating steam engine, Chen Jian said that science is power.

When seeing all kinds of weird chemical salts make wheat grow vigorously, Chen Jian said that science is fertilizer.

When he saw that the telescope brought the distant things closer, Chen Jian said that science is the eyes.

…Science has become a lot of things here, and now he wants to become a painter, which subverts the three views of everyone present.

Power, fertilizer, eyes... or anything else, they are just things, things controlled by people.

What is a painter?

A painter is a person, a person with a soul, and a title obtained by a person with soul and brain control with years of honed hands.

When science replaces people one day, what is science then?Monsters over humans?Or... ghosts and gods?

Before that, everyone present believed in the power of science, but they never believed that science could replace human beings. But this time Chen Jian said something that scared them.

They knew that Chen Jian hardly lied about these matters.

In addition to being shocked, I became more and more curious.

Those disciples who are not qualified to take pictures with these people are also tickled by Chen Jian. They are not the masters of the academy, so they have not yet fallen into philosophical speculation. What they think about is what is this thing that can replace the painter .

At Chen Jian's suggestion, everyone sat quietly. After waiting for about a quarter of an hour, Chen Jian told them that the painting was finished.

But the portrait was not shown. Seeing that Chen Jian was busy in that tent again, everyone breathed a sigh of relief this time, thinking that it still depends on people... Even if it is drawn, it can only be said that science is A paintbrush, not a science, is a painter. What you Chen Jian said is too scary.

On the morning of the second day, Chen Jian took dozens of photos developed with egg white photo paper, smirked and wrote his name on the back of each photo with special dye.

Silver chloride photosensitive photos are black and white, without color correction with solutions such as borax and aqua regia, and the fiber material of the paper is still too obvious, which makes these photos look ugly.

The exposure time has been tested several times before, and the effect is not bad.

Anyway, this is a real photo, if you don't count the ones that were wasted by Chen Jian's previous experiments.

Compared with the first asphalt photosensitive photo on the normal world line, it is several times better. If silver iodide is used instead of cheap silver chloride, the effect can reach the photo level of the first industrial revolution era. Chen Jian is quite satisfied.

Photos can clearly distinguish human faces, and you can recognize yourself at a glance, and it is more realistic than most painters.

In this photo, there are a total of 46 people, including 13 Mr. Xuegong, and the rest of naturalists and celebrities in the circle.

Chen Jian was standing in the third row. He was the youngest. He could only say that he was qualified to stand with these people from the name of Mr. Xuegong.

Chen Jian admired and was familiar with those sitting in the first row. There were mathematicians, astronomers, agronomists... only Mr. Mu Lao, who was missing his real husband, was unable to come because of his poor health.

The one-and-a-half-month workshop identified many seemingly useless things.

It took a month for this group of people to reach a consensus to unify the weights and measures, the unit of measurement, and the names of some things in the circle.

It took a full half a month to determine the names of pressure, force, energy, momentum, length, chemical symbols using the zodiac, limit, approach, and so on.Pressure is no longer Pascal, but force is still cattle.