"We've just finished talking about the geomagnetic poles and the compass!, so I'm going to explain why the miniature dreaddragon doesn't get lost even when it flies very far. ”

Carrying one of Ciel's horror dragons to the podium, Green pointed to a hairy tentacle in the middle of its head and said, "Do you see this? Its principle is very similar to that of a compass, which measures changes in the geomagnetic field and points out the direction for itself. ”

"Of course, it can also recognize the surrounding environment and celestial bodies through its eyes, providing itself with a more accurate navigation ......"

"Boom!"

Just as Green was in a newly built concrete room, explaining the characteristics of the terrifying dragon to the students, an explosion suddenly came from outside, which immediately startled him.

"What's going on?" Green asked, looking at the waves in the blacksmith's shop, the watery ground everywhere, to the crowd tidying up the house.

After arriving on Trotham, Sam's father, Old Hunter, led the family to build a new house and then moved the blacksmith shop from Thor. It wasn't that far from the new classroom, so Green rushed over right away.

"The cylinder of the steam engine leaked and then exploded. Sam walked over and said helplessly.

Some time ago, after Green gave the drawings of the Newcommen steam engine to Old Hunter, with his help, the people in the blacksmith shop quickly made it.

The structure of the Newcomen steam engine is simple and easy to make, but the utilization rate of thermal efficiency is not high, and it is only suitable for pumping water in coal mining areas.

However, although he knows the future direction and improvement methods of the steam engine, in order to let everyone understand its working principle and the process of exercising production, Green can only build it step by step along the development process of the steam engine.

When the trial production of the Newcomen steam type was successful, he immediately took out the drawings of the Watt steam engine, and then asked the people in the blacksmith shop to try to make it, but he didn't expect that there was still an accident now.

"No one is hurt, is it?" asked Green, hurryingly.

"No! The iron felt was in front of it, and it was slapped aside with its tail, and everyone was completely fine except for a little hot water. ”

"How did it explode? Didn't you install a safety valve?"

"We've got all these new stuffs on them! But you know, it's hard to make things that are handmade without gaps. Old Hunter came over and picked up a twisted iron plate on the ground.

Green scratched his head helplessly after understanding the reason.

Before the invention of modern welding and machine tools, the components made by rivets and forg-welded components were indeed very unreliable, and they also tested the craftsmanship of blacksmiths.

Although it was not easy, building a steam engine was still a path he had to take in the future.

Dragons are powerful and capable, but they are still animal power in nature, so there will be times when they are tired and slack, which is also a biological limitation.

The steel casting machine will not have such a problem at all, but now in the face of the problem of manufacturing process, Green can't help but feel a little worried: how to solve this problem?

＊＊＊＊＊＊

In the stormy sea in the western part of the Greenskin Continent, the frigate Marvel of the Dragonheart Royal Navy is sailing aimlessly.

Captain Jack O'Boray sat bored on the bow of the ship, looking at the empty sea and sighed: this mission is really boring!

Since the once invincible armada of the Kingdom of Barcelona was defeated by the Royal Navy of the Kingdom of Dragonheart some time ago, those bullfighters who are unwilling to be monopolized by the "Greenskin Trade" have learned the method used by the Dragonheart Kingdom: organize a large number of privateers to attack those merchant ships that travel between the New World and the Greenskin Continent.

As a result, the Marvel was sent on a mission to combat these privateers.

It's just that they have been cruising on this route for half a month, and not only have they not encountered any privateers, but they have not even encountered a few merchant ships.

Could it be that something is going on?, Captain Jack, who was blowing in the sea breeze, couldn't help but think to himself.

"Look, what's that?"

"Oh my God, there's a ship flying in the sky!"

Hearing the shouts of the sailors, Captain Jack almost plunged headlong into the sea, which is too.

He immediately looked up and around, and then he actually spotted a small flying boat in the sky.

"Captain, look!" the first mate of the Marvel handed the monoculars to Jack.

It was a weird-looking thing.

The top half is an oval like an egg, while the bottom half hangs a small boat that is not too big.

There is also an impressive flag at the tail of the boat.

Hell, it's something from the Goblin Race Freedom Alliance on Kozan Island.

Captain Jack couldn't help but laugh and put down the goggles in his hand.

"What the hell is that? It can't be a boat hanging from a dragon, is it?" asked the first mate in surprise.

If there's one thing that's been the most famous lately, it's the legend of the Dragon Knight.

It first came out of the mouths of those pirates.

The Blood Demon Pirate who had once entered the Sea of Mist had returned unharmed, and had brought with him a large amount of gold, silver, and jewelry. It turned out that there were no demons at all in the north of the Misty Sea, but those Viking pirates who had burned and looted on the Demon Continent back then. They haven't changed much over the years, but there are some incredible changes: they can tame those evil dragons into their mounts and use them as a class.

Word of mouth has become so outrageous that most people see it as a trick used by pirates to scare people.

Prevent others from getting ahead of the curve and snatching the opportunity of their plundered wealth.

"It's not a dragon, it looks like an airbag. Captain Jack said after a moment's thought.

Speaking of which, this Goblin Race Freedom Alliance is also a strange flower on the Greenskin Continent.

While other goblins may even sell themselves for money, the alliance calls on all the goblins on the Greenskin Continent to unite and drive out the humans who enslave and sell them.

As you can imagine, not only were they not recognized by their peers, but they were also hunted down to an island.

Unwilling to fail, the Freedom Alliance, with a variety of bizarre weapons, launched several offensives against humanity, but each time it ended in tragedy.

Because their whimsical weapons are too shoddy.

"What are they going to do this time?" looked at the spaceship that had already flown over the Marvel, and the first mate couldn't help but guess.

Soon he got the answer he wanted, and the goblins had dropped a lot of burning palm berries from the sky.

"Fold, fire!" said Captain Jack, who looked at the palm fruit that kept falling into the water, and panicked.

If these fucking goblins burn all the sails of the Marvel, they're in real trouble.

However, just as the sailors and soldiers on the Marvel were shooting into the air in a panic, they suddenly heard a "boom" sound.

The goblin's spaceship crashed crookedly into the sea.

"Did you get hit?" someone shouted.

"No, they're too high! ”

"It's as if they blew it up on their own. ”

......

Captain Jack and his first mate looked at each other for a moment, then came back to his senses and said, "Get the boat over! Get that thing up and I'll see what it is." ”