Fang Zi'an didn't know much about the principle of the steam engine. Just imagine, even if the people of later generations have a terrifying amount of knowledge, but who will seriously understand the principles and methods of manufacturing a machine. And it was still a steam engine, which in the eyes of later generations was actually an old antique, and it had long been eliminated in the garbage heap of history.

Part of Fang Zi'an's knowledge about this came from the limited introduction in textbooks when he was in school. The reason why I want to learn is because it is the knowledge point that may be tested in the exam. The book still maintains some respect for the steam engine, the machine that ushered in the industrial age. So in addition to knowing that the steam engine was invented by a guy named 'Watt', Fang Zi'an also knew some simple operating principles. This has become Fang Zi'an's most superficial understanding of the steam engine.

However, Fang Zi'an's real contact with the real thing was after joining the army. After being selected as a special soldier, during an exercise, Fang Zi'an saw those behemoth-like trains and locomotives in the military base hollowed out in the western mountains. These rusty steam locomotives are actually obsolete things, but they have been preserved hidden in deep caves. This may sound a little funny, Fang Zi'anlai's era was already the era of electrification, gasoline engines and diesel engines can be called backward machinery, and the state has preserved these obsolete thousands of steam locomotives, which is really puzzling.

But soon, Fang Zi'an understood why. It's all prepared for extreme situations. At that time, the world was not peaceful, the clouds of war always hung over the earth, and all kinds of weapons that could destroy the world emerged one after another. Once the war starts, it is likely that all intelligent, electrified, and information-based things will be cleared. In the end of the war, anything modern will be destroyed, and only these machines that do not rely on any electricity and intelligence will be the most reliable. It is likely that in the end, it will be these primitive machines that will be regarded as primitive in later generations, but will be the last thing that can be relied on.

To put it simply, all of this is prepared for the most extreme times. It is unlikely that humanity will return to the Stone Age because of the war, but it is likely to return to the age of the steam engine. It is conceivable that, in addition to the thousands of steam locomotive heads, there may be many similar obsolete machines hidden elsewhere that can be reactivated in extreme cases.

The code name of that exercise was 'Doomsday', and Fang Zi'an later understood the intention of this code name. As part of the exercise, one of the tasks of Fang Zi'an and some other special forces was to get a rusty locomotive back up and running in a short period of time, and that is when Fang Zi'an actually came into contact with the steam engine that could make the train move. And this is also the psychological and intellectual basis for Fang Zi'an to dare to produce this thing.

In fact, the working principle of the steam engine can be described in the simplest words, that is, the mechanical energy generated by the steam is converted and utilized, and the mechanical lever and various torques are used to change the direction and magnitude of the force, and finally used in the place where it is intended to act.

Although the principle is simple, it is extremely difficult to actually create it. Although Fang Zi'an did not have the luxury of building a perfect machine with extreme ingenuity, Fang Zi'an only needed a machine that could push the crankshaft to rotate and do work, which could convert energy. As for how efficient, how strong, whether the ship can be propelled, that's another matter. The first thing Fang Zi'an had to solve was the problem of existence and non-existence, and verified whether the structure he drew based on his not very clear memory was wrong.

Fang Zi'an first wants to build a small verification machine, and only after the verification prototype is successful, and after it has been improved and confirmed to be operational, he will spend a lot of money to build a real steam monster. For several days in a row, Fang Zi'an went in and out of various foundries and blacksmith shops in the capital, and a few days later, there was a cast wrought iron boiler as tall as a large water tank and a pile of iron pipes and strange-shaped parts in the back house of the Fang family. Then, Fang Zi'an called a few home nurses to help, and began to get busy next to the pond in the back garden.

No one knows what he's going to do, Chunni and Lao Huang and others don't know what happened to Fang Zi'an? Got a lot of inexplicable things in the back garden, do you want to use iron to make rockery scenery? asked Fang Zi'an, Fang Zi'an didn't explain at all, only waved his hand and said, "You don't have to worry about me, do your own thing." I'm not crazy, I'm not bored, you don't worry. ”

Chunni had no choice but to let him toss. The only thing I am worried about is that the spring season is approaching, and my husband actually put books to do these inexplicable things, I am afraid that it will be greatly detrimental to the examination of fame. More than ten days later, Chunni couldn't help it anymore, and went to Wanchun Garden to ask Qin Xiqing to persuade Fang Zi'an. Qin Xiqing was preparing for the Wanchun Garden Song Party on March 3, but she still took the time to come here. When Chunni led Qin Xiqing to the back garden, Qin Xiqing was stunned by the situation in front of her.

A large lump of iron, with various iron boxes, curved iron pipes, and various combinations of discs with gears, crawled on the side of the bamboo forest by the pond. It is said to be a rockery scenery, but it is not at all. It's like a giant iron crab crawling on the ground. On such a cold day, Fang Zi'an was sweating and wearing only a single coat. Running around the iron monster with his sleeves, he went up from time to time to knock and knock, making the whole back garden a noise.

When Fang Zi'an saw Qin Xiqing coming, he was overjoyed and said: "Xiqing, you came just in time, show you a good show, you came really coincidentally, just to witness the first operation of my thing." ”

"What are you...... What are you doing? What is this? Qin Xiqing asked in astonishment.

"Well, hehe, you'll understand in a moment. Ah Xiang, is the disc of the waterwheel connected to the crank? Check it out. Fugui, go and push the charcoal you bought yesterday in a cart. Fang Zi'an waved his hand and ordered.

Qin Xiqing and Chunni stared at Fang Zi'an's shouting and shouting, and several nurses were busy under his command.

"Miss Qin, you see, he has been busy with these things for nearly half a month. Soon it's March, and it's spring in mid-March, do you think I'm in a hurry? Persuade him quickly. Chunni whispered.

Qin Xiqing chuckled and said, "You are his wife, if you don't say it, you want me to say it." ”

Chunni said softly: "He will definitely listen to you, I can't persuade him." Besides, are you an outsider? ”

Qin Xiqing smiled, and her heart was also useful. Chunni still knows where she is, but she just entered the door a day earlier, but she doesn't take it for granted.

"Let's see what he does. Zi'an's actions are often unpredictable, he has spent half a month busy with these, it shouldn't be nonsense, and look at what this thing is, what is the use. More on that later. Qin Xiqing said.

Chunni nodded and said, "That's right." ”

After some busyness, it finally seemed that everything was ready, Fang Zi'an took matters into his own hands, poured buckets of clean water into the boiler, and then sealed the water inlet.

"Light the fire, boil the water!" Fang Zi'an shouted.

A helper piled firewood in the lower chamber of the boiler and lit a fire, and after the firewood crackled and burned, he threw a large piece of charcoal into it and lit it, and with the help of the bellows, the charcoal soon burned red, and the area around the boiler became hot.

With Qin Xiqing's intelligence, he didn't understand what Fang Zi'an was doing? Boil water? So what? Isn't this big furnace going to be too much? It's really disturbing.

Fang Zi'an stared at a wooden rod inserted in the small hole above the boiler, only to see that the hot gas in the small hole was coming out more and more, and finally with a hula, the thicker part under the wooden rod was jacked up, completely blocking the small hole, Fang Zi'an knew that the steam pressure inside should not be small. If you can lift the wooden pole, the steam pressure inside is already very high. The wooden pole actually plays the role of measuring the water level, if the water level is too low, the scale on the wooden pole will be realistic, which is also a local method with no way.

The water in the entire boiler boiled and made a terrible rumbling sound. This boiler is cast as a whole, but because it is only a verification, Fang Zi'an does not require how good its smelting technology is, so the bearing capacity of this boiler should be very limited. Fang Zi'an didn't want an explosion accident, and it was almost time. So he began to twist the valve of a cast pipe with the thickness of an arm attached to the boiler.

When the valve was loosened, the next moment white steam erupted from the connections of all the large and small pipes, all in all directions, up and down, left and right, as if a bulging ball had been punctured by someone around dozens of holes, and all the gas inside spewed out. It was February, but the weather was still cold, and the steam was spewing out, and the snow-white mist was rising, enveloping almost everyone around.

"Damn, the seal wasn't done, I knew it was going to be like this. It has to be upholstered with cooked cowhide. Fang Zi'an's scolding came from the fog, although he couldn't see his appearance, Qin Xiqing and Chunni could imagine his angry appearance.

"Increase the firepower, pull the bellows, quick." Fang Zi'an shouted.

The sound of the bellows pulling became more frequent, the sound of the fire burning was whirring, and the fire was obviously increasing. There was a terrible rumbling sound in the boiler, boiling water boiling inside, and more white gas came out of it, and there was a loud snorting sound.

There was a click, and something seemed to move. The next moment was as if I had arrived at a gong, drum, water and land dojo, and there was a rumbling sound and a dull and unpleasant grinding sound in the white air. Qin Xiqing and Chunni looked over there in surprise without blinking, only to see an iron rod poking out of the white gas slowly expanding, driving a disc mounted on the axle of the pond water wheel to rotate. The wooden tray of the one-man tall waterwheel also turned, and a scoop of water was scooped up, turned for half a week, and then poured into the pond, making a huge splash sound. Qin Xiqing and Chunni looked at all this in amazement, not knowing what to say.

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