Chapter 3471 Painter's Window (VI)

As early as 1783, after the Montgolfier brothers used hydrogen balloons to launch, the French Academy of Sciences established the aerostat project (PROJET DE MACHINE AROSTATIQUE), which was later managed by Laplace. At that time, Napoleon was still studying at the Paris Military Academy and was Laplace's student.

Of course, confidential things would not be told to a student. The project was divided into many branches, one of which developed a seawater desalination machine. Its principle was different from evaporating and condensing seawater through glassware. At the beginning, Lavoisier decomposed water to form oxygen and hydrogen, and hydrogen was used to make aerostats. After burning, hydrogen turned into water again.

Then this person began to study the curvature of the aerostat. The "aerostat drawings" that Georgiana saw were almost the same as the Zeppelin airship. The difference was that the "aerostat" had not completely gotten rid of the structure of the hot air balloon. There were many cables wrapped around the "big balloon", and the other end of the cable was tied to something like a ship, the purpose of which was to float on the water during an emergency landing.

There is also a "propeller" on the aerostat, but it looks like a rotating paddle, so the aerostat does not need to rely on the wind to operate.

However, there is no power source on it, and the soldiers on board may need to provide power like riding a bicycle. In theory, it can accommodate 30 men and 60 days of food. Even if the French go up to the sky, they are still the army.

The balloon has two layers. The first layer is ordinary atmosphere. It acts as a ballast and protective cover to protect the second layer of "canvas bags" filled with flammable gases.

Pomona remembered that the Zeppelin airship was also filled with hydrogen, so it was very flammable, and once it caught fire, it was almost impossible to extinguish.

At that time, there was no term "blackout", and the Zeppelin airship always attacked at night. They left in the early morning after dropping the "cargo", and the street lights and lights in the houses in the British city were their best reference.

After the "blackout", all the lights went out. At this time, the wizards rode brooms and other flying equipment to besiege the "air beast". No one could see except the members of the airship who were about to fall.

The airship has a thick aluminum shell on its surface, just like the skin of a whale. Even if it is a big one, it is just a "thin skin" for a whale, and it is not something that a mosquito can bite.

However, it has a weakness, which is the engine that makes a "buzzing" sound. That sound used to be like a nightmare, and every time it appeared, it would wake people up from their sweet dreams.

As long as it is lit, not only will the airship lose power, but the wind at high altitude will also help the combustion, and then you just need to wait and see the "fireworks".

The "audience" on the ground doesn't know who did it, but they will be very happy to see the "fireworks".

When the Nazis came to power, the era of Zeppelin airships had come to an end, and faster aircraft had come out. Goering issued an order to use the aluminum used for the Zeppelin hull frame on aircraft.

Alum can extract aluminum, but Georgiana still didn't tell Simon. Bonaparte felt that this project was not worth continuing for two reasons.

The first is that the speed is too slow, and he always likes highly maneuverable things.

The second is that this thing made him embarrassed in Egypt. In 1796, he established a balloon company during the blockade of Mantua. His purpose was to use balloons to transmit intelligence.

Later, he came up with the idea of ​​using cannon fire to transmit intelligence, and the balloon was no longer used. When he went to Egypt in 1798, the Italian Corps took this thing with them and flew it in Cairo. For some unknown reason, it deflated halfway, and the Egyptians laughed at it and said it was no different from a kite.

In 1799, the Ministry of War decided to disband the balloon corps, and Napoleon did not think of restoring it after becoming the first consul.

Simon designed a ship propeller using bronze. He was a competitor of French engineer Charles Darley. The reason why Fulton's paddle wheel warship was rejected by the French Navy was that once the paddle wheel was hit, the ship quickly lost power. The propellers designed by Simon and Charles were all underwater.

To design a propeller, you need to involve knowledge of fluid mechanics and geometry, and the flow rate of seawater and the rotation speed of the blades need to be taken into consideration.

This involves a mathematician named Mesnier, who published a book called "Curvature of Surfaces" and discovered the "Mesnier Theorem".

His main research direction is fluid statics. The balloon designed to be elliptical is not a consideration of fluid mechanics, but the lift of the balloon.

In short, Georgiana didn't talk too much with Simon about "aerostats", and the "subway" thing also got to a dead end. Later, they started talking about sugar. Simon has studied the effects of sugar and salt on food preservation and decay, and then he appeared at the dinner.

Another "interesting topic" is about the girl who has lived in the tree for two years. Her name is Julia, she is 15 years old this year, and the fir tree she wants to protect is 1,500 years old and is the tallest in the forest.

Since Mulla opened up the commons, the forest swamp has become a "battlefield". The landlords plan to open them up to grow wheat, and the farmers want to protect the swamp because there are reeds in the swamp, which can be used for weaving, as forage, etc., which is what many farmers rely on for their livelihood.

The reasons why conscription was difficult to implement in Italy were, first, that young labor was irreplaceable, and second, that military service meant safeguarding the interests of the landlords. As a result, some farmers and laborers would set out for South America with the help of priests, and some who really did not want to leave would become bandits.

As for the girl in the tree, she not only lived on the top of the tree for two years, but also relied on rainwater for drinking. It often thundered when it rained, but there was no thunder that struck the tree where she stayed.

If she continued to stay in the tree, she would sooner or later be regarded as a saint, so the village head, town head, and mayor asked her to come down one by one, but she refused and insisted that they promise not to touch "Luna" and the forest.

"Luna?" Georgiana asked Bougainville.

"She named the tree." Bougainville said with a smile.

Georgiana was thoughtful.

"What happened later? Did she come down?" asked Catherine from the Netherlands.

"She hasn't come down yet. She doesn't believe them. Once she leaves, they will definitely cut down the forest." Bougainville said.

Witches in fairy tales always live in the forest, but they live under the trees. Who would run to the top of the tree?

"Are you really going to persuade her to come down?" Bougainville asked Georgiana with a smile.

She smiled and took the champagne to go somewhere else.

Among the guests attending the banquet, Georgiana saw Arthur Young, and he didn't know anything about his experience in France.

Like many French people, Italians also took this opportunity to buy public land. They found a bank loan and used the land as collateral.

As long as the harvest was not good, they were forced to sell the land. This resentment was even worse than before the reform, because the public land of the village community was gone. Originally, the big landowners had no excuse to occupy the public land, because the villagers would resist on the grounds that it was public land. In the enclosure movement, the landlords rented the land to whoever offered the highest rent.

The centaurs often patrolled the forbidden forest, because in their eyes, the forbidden forest was their territory.

The "patron saint" of Italy would do the same. The village community would organize people every year to claim ownership of the disputed land.

It was okay to let Julia come down and keep the contract, but the village chiefs and mayors treated her as a child, thinking that they could just coax her down and do whatever they wanted after she left.

That's why children don't trust adults and don't tell adults any secrets.

Georgiana glanced and saw Alessandro again, who was still playing with the "kindergarten".

She originally wanted to transfer Leo to another environment that was more suitable for him... She turned a blind eye and walked away.

Umbridge was disliked because she was too nosy, so she should not interfere with the young people's right to make friends. Just like during the American War of Independence, the British and American Ministries of Magic did not interfere.

When she reached the window, the city was dark because there were no lights on.

Then she looked up. The moon on the spring equinox was a full moon, and the moon on this Holy Saturday was full and waning, becoming a waning moon.

This weather is very suitable for stargazing. I hope she can have time to go to the observatory to see it.