"You, put these two pieces of iron together." The black dragon said that underneath the massive body was a group of silent spellcasters and red lotus goblins.

The caster nodded and gripped the two iron plates, flames erupting from between his fingers, melting at a speed visible to the naked eye.

"That's it, reduce the mana, and do it again on the back."

The caster complied, and the two iron plates were spliced together at ninety degrees and firmly welded together.

This is not difficult, any caster with a certain level of skill can do it, even Caesar himself, this psionic black dragon already has the ability to distort matter by will.

Caesar glanced at the interface, and the dragon's delicate vision allowed him to clearly see the changes at the interface - a perfect weld with no flaws suddenly appeared, and if it was slightly polished, the traces of the metal fluid when the iron was melted were polished, and the two iron plates were almost indistinguishable from the forging body formed at one time.

In the field of welding, it is quite difficult to achieve a smooth and seamless weld, but it is easy to solve it with supernatural powers.

"Well done." The Black Dragon Emperor did not hesitate to praise him: "Next, weld the other two iron plates as well." ”

"What is this?"

Luna popped out of his head and asked, "A metal ...... Bucket? ”

"No, it's a cylinder." Caesar corrected.

"Cylinder?" Luna repeated in confusion, looking at the barrel that had been welded, just the right size for her to bathe.

"You can think of it as a part of the core of the magic."

Caesar said, his eyes glancing at another square iron plate: "Do you see the hole in it?" From here, air enters the cylinder block and pushes the pistons. Hmm—the piston is a piece of iron that is slightly smaller than the inner diameter of the cylinder, and it can move freely in it. ”

"Caesar, thou hast made up new words."

Even though she was used to it, Luna was still a little dizzy, and at this time, it was almost like asking a master who studied magic to listen to the black dragon's explanation, and the little guy had a hard time understanding: "Can't you just tell me what this thing is for?" Is it also an explosive weapon? ”

"No, it's a production machine."

The steam engine, the most iconic invention of the earth, brought the driving force needed for the first industrial revolution on the earth, and after that, the earth's civilization increased productivity in a near-leap attitude, liberating human and animal power.

The inspiration for the creation of the steam engine came from the Red Lotus Goblins, many of whom were as timid as rats, who were not interested in weapon research and development, and did not dare to continue the research on gunpowder, but were full of curiosity about the lid of the pot that kept jumping when boiling water, and secretly studied it, and as a result, they caused the fryer incident, which alarmed the Black Dragon Emperor.

Caesar was ready to shock the world by getting the steam engine out first.

The principle is not complicated, it is simply an enlarged version of the boiling kettle, the boiling steam is directed into the cylinder, and then the piston and connecting rod are pushed, and the heat energy is converted into mechanical energy and then exported outward.

The principle is simple, but it does not mean that it is easy to manufacture, the difficulty of this mechanical part lies in the tightness of the cylinder and piston, and the choice of material for the transmission pipe, before the level of metalworking has reached a certain level, it is impossible to make a perfect cylinder, and the Red Lotus Goblins died on this - they just didn't realize the problem.

It was not easy for the steam engine to really come into existence, and in the earth where Caesar lived, it came into being only after civilization had developed to a certain extent and had sufficient technical reserves.

But in a world where you can weld and rub cylinders by hand, manufacturing problems can be easily bypassed and solved.

Caesar only needs to design four iron plates of the same size in advance, give the design drawings, and then let the goblin factory cast and polish it, weld it by magic and fix the shape, and then get the formed cylinder.

But this doesn't mean that everything is fine, there are still troubles to deal with, and square cylinders cannot solve the problem of stress stabilization - the forces in the cylinders are concentrated in the four corners, and the pistons are acting at high speeds, even if the vibration of the machine itself is not considered, high temperature and high pressure alone are enough to destroy the weld, and it becomes extremely difficult to maintain air tightness.

Normally, the only way to solve this problem is to change the design, or choose a higher strength material.

It is impossible to change the design, it is impossible to change it in this life, Caesar only has this little thing in his head, and he can't take it out no matter how much he has.

Higher-strength alloy materials depend on the development of physics and chemistry, and the other countries of Eladia are not on the same path as the Black Wing Empire, this material cannot be imported, and the empire needs to spend money and time to accumulate a database, and after a large number of successful proportioning tests in the laboratory, it can be manufactured.

Without the help of these supernatural powers, Caesar might have had to wait a hundred years, but now, Caesar can use the blessing of magic to increase strength and stability, and make the current steam engine resemble an enchanted creation.

Of course, this does not mean that the steam engine will always need to rely on supernatural powers, just like a toddler needs a walker, and when the baby grows up and the science of the empire gradually catches up, the steam engine can be freed from this constraint and can be built and run normally even without a spellcaster.

So several spellcasters, a group of Red Lotus goblins, and affiliated institutions played with him around the Black Dragon Emperor for two days, and finally put together this steam engine in the arsenal camp.

In fact, there is a tool to replace the steam engine in Eladia, which has been named the 'magic core' by scholars, and when needed, converts the mana stored in it into power output, which is consistent with the properties of the steam engine, and is more efficient and portable.

But because of the high cost and difficulty of production, all of this kind of stuff is used by the ruling class, and it is impossible to produce it on a large scale.

"Your Majesty, that's what you said ......"

Half-Lich Wren looked at the strange machine suspiciously, it looked like a sealed furnace, covered in various pieces of iron lumps, and it looked a little deformed, although it had been blessed with magic, but it was some simple stability control magic.

How does it move without a magic core inserted? Could His Majesty the Emperor still be able to give it life? And this thing looks clumsy, does it have hands, feet, wings, and what kind of way to move?

"Hmph."

However, in Caesar's eyes full of superiority, this seemingly rudimentary machine exudes an alternative beauty, which is the smell of industry, the fragrance of capital, and the foreshadowing of the rise of the Blackwing Empire, which is destined to take another path.

He had the goblins pour two buckets of water into the steam room and light the firewood below.

Soon the water is boiled, gurgling and tumbling, and the cylinder gradually crackles, which is the sound of the cylinder body being heated and expanding, the piston is relatively thin, and the expansion deformation caused by the heat is greater than that of the cylinder, and it will eventually be firmly against the cylinder wall.

The hesitation of the different spellcasters, after seeing this scene, the eyes of the red lotus goblins burst into a shining light, this is the scene of their experiments at that time, these little guys hurriedly moved forward, trying to get closer and observe carefully.

When the cylinder is filled with steam, the door to the new world is opened, the piston begins to push the connecting rod outward, when the movement reaches its peak, another connecting rod pulls the sliding valve, the steam pushes the piston back inward, the two connecting rods move back and forth, the additional rollers rotate rapidly, and as the firepower increases, the speed reaches its peak.

The machine made a high-pitched stinging sound, and the exhaust port snorted and sprayed white mist, which was shocking.

"It's ...... What power?"

Wren asked blankly, as a half-lich who studied and cast spells, even if he saw it with his own eyes the whole time, he still didn't understand what drove this "iron furnace" to move.