The emperor and the others went back first, but now the experiments in this place are still continuing.

Because this experiment is not just a little bit like this, but it is also experimenting with another experiment about lightning.

To do a lightning rod to guide the lightning, this is of course a method, just make a big copper needle, as long as the place is high enough, it is possible to make the lightning split.

It's not necessarily temporary, but it's definitely going to work.

Li Hang didn't care about this, but wanted to know what the generator he made over there at this time needed.

This permanent magnet is found in natural magnetite, what is the use of magnetite like this?

Obviously, this is very useful.

This permanent magnet can not only be used to brush electricity, but also to use this electricity more often to play with something else.

Although you may not be able to make something shocking yourself, at least you can easily make something that shocks them.

This hot air balloon isn't a very powerful thing, but it can scare them.

After this side was done, Li Hang let people start to prepare.

Gassing, heating, that's a very interesting thing, and at this time you can also test some other things, such as the combustion of the coal stove and this firewood. As long as this can be calculated well, it may also be able to calculate a calorific value ratio.

"You can roughly see which is faster with less coal or charcoal of the same weight!"

Li Hang looked at the large hot air balloon with almost the same amount, and the size of this hot air balloon was about the same. Now we only need to compare to roughly calculate how much charcoal a briquette is equivalent to.

At this time, the lotus root coal that Li Hang made can almost be promoted.

"Hmm!" Ying Yun nodded.

He is watching this coal thing every day, and he is quite aware of the benefits of this thing, which means that this is just some by-industry of forging steel, if it can be operated, it is a good thing.

"So can we people use this to make an interesting comparison?" While saying Li Hang, he looked at Ying Yun on the side.

"Are you trying to ......?"

Obviously, the hot air balloon at this time can not fly high, if it really flies too high, I am afraid that it will be easy to come back, and at this time, there is a very troublesome problem, that is, it is not like the future generations, at this time the hot air balloon thrown into the air is actually a big fire source, if this thing really falls, it is likely to be very troublesome.

Once it falls into someone else's house, I am afraid that it will cause a fire.

However, it is possible to detect certain other things.

"You want to try this?" Ying Yun pointed to the telescope in the distance.

"Hmm!"

How far you can see at this time is not up to you.

"Okay! If I'm ready, maybe I'll be sure. ”

"Yes!" Li Hang nodded very seriously.

If you want to say that this telescope, in fact, there is also a focal length setting. Although it is possible to make an adjustment with certain things, there is also a scope for this adjustment. "Actually, we have to take our time to look at this thing, you look at this, for example, this maximum distance, which is a very valuable reference. And then there's the scale! ”

"Scale?" Ying Yun looked at Li Hang with some puzzlement.

To put it bluntly, it is to use a lens of the same size to make a measuring scale, and make a small mark on the outside, that is, if he uses this telescope to observe and see clearly, and then look at the ruler outside, he can roughly know how far away the other party is. This means that once we control it well, we can even know more detailed information. And we've got a lot of good stuff to get them all done. Li Hang said as he looked into the distance.

Both the city walls and the barracks outside can be used as concrete references, and these references are basically constant distances, which can be used to engrave scales.

Ying Yun, who was standing on the side, looked at all this curiously, it was indeed a more interesting thing, but he knew very well that if it was really calculated at this time, the value of this hot air balloon would be much higher.

With the ignition of those on the side.

The balloons inflated gradually.

Then he flew up in front of the two of them, and although he was only three meters above the ground, he was pulled and the stove was opened.

But that's it, this hot air balloon has been supported for about half an hour or so, and it is indeed flying, plus the gondola itself bears the weight, if you calculate it again, it is estimated that even if you count these fuels, these things can fly for a long time.

Li Hang looked at this thing curiously.

"How?"

"The suppression of ten big stones did not let it fly away, and a few stones could not be pulled."

"That's fine!" Li Hang smiled indifferently.

This kind of thing will definitely have to be done by yourself for a while, but this time it is already possible.

"How's your majesty doing?" Compared with this, Li Hang was more concerned about His Majesty the Emperor's proposal for his own plan to repair bridges and pave roads.

This thing is actually used to house the homeless, and if such a plan is placed on weekdays, it is nothing. But at this time, this thing is an artifact.

In ancient times, the displaced people were basically tens of thousands, hundreds of thousands, and almost all the people in a city and a region left.

But this kind of departure is equivalent to turning a place into a dead land.

Li Hang was very curious, what would he choose?

"It's being considered here." At this time, Ying Yun didn't know what to say.

This kind of thing is actually very cautious.

If he hadn't known about Li Hang's overall plan, it was estimated that even Emperor Win Wu would not dare to do it easily.

Because in doing so, these families will have a lot of power, and they will have enough power that they will even be able to gather a lot of refugees.

In this way, the power is greater.

If it weren't for Li Hang's plan to weaken them and his plan to take back the land, I'm afraid this matter would have been even worse.

But don't worry about that now. They have done so for a short time at best, and the real money and food have already been spent.

It's just that they may become stronger in the future, not really become stronger.

So at this time, as long as this possibility is cut off, then this thing will be easy to do. And now the ministers are discussing whether they can cut it off or not.

Because many ministers themselves are members of the family. So I will be more cautious in this kind of thing.