A rough bamboo tube appeared in front of Yang Heng, and when he took it over, it turned out to be two bamboo tubes set together, if he wanted to adjust it, he needed to stretch it slowly, and it was not even very fixed, and he also needed to stuff a small wooden stick on the side.

"This is your masterpiece these days, such an ugly thing." Yang Heng became angry when he saw it, "Didn't I equip you with some craftsmen, so you can't let them use copper or some metal to make a metal cylinder to adjust the distance?" ”

"The owner, the owner, don't get angry, isn't this to save you some money, this just to do what you said about the concave lens convex lens wastes a lot of crystals, and then waste some copper and iron or something doesn't increase your burden, you must know that every time you make a set of inappropriate will waste a set, it is better to use a bamboo tube to make it first, and then use metal to make it."

"Alas, how can I say hello to you, isn't this metal recyclable, why are you so brainless, besides, the materials I give you are just for you to waste, there is no waste, where is the harvest, let me see, how are the lenses you made."

"This is very good, you see, you can see far away, you look at the top of that chimney, we can see the small iron rod clearly, by the way, the owner, what is that iron rod for, and it was pulled down with a thinner wire, and the lower part is buried in the ground, isn't it a waste?" What is it, you have noticed, it is a lightning rod, but can I tell you, you still don't jump.

Yang Heng naturally wouldn't make that kind of low-level mistake, build a chimney of a high blast furnace, and let the thunder break it. So at the time of design. I designed all the lightning rods. It's just that this is a standard configuration, and I didn't tell the craftsmen that it plays a role, but the craftsmen at this time are really serious, although they don't understand, they still installed it according to the need, but this actually let these Taoist priests see it.

"Here, let me see." As he spoke, Yang Heng took the simple bamboo telescope. He looked at the cigarette pipe in the distance. "Well, yes, it's according to my design, without any changes." This really can't be changed, how high the lightning rod should extend out of the highest point of the building, and how thick the iron wire needs to be pulled down, all have certain specifications, but I don't know how deep they buried it underneath, whether it was according to Yang Heng's requirements to cover a piece of ground with loess below, and some iron bars had to be buried in it and welded together with the iron wire above. It is even necessary to pour a certain amount of salt into the loess to increase the conductivity. Especially in this era, there is no grounding tester, and it is impossible to know the accurate grounding resistance of the road, and the grounding resistance is not up to standard, so that the lightning will break the iron bar, and even the chimney will be broken.

But the effect is okay, because Yang Heng found that there is a trace of melting at the top of the lightning rod, which seems to have been struck by lightning, and there is nothing below, it seems to have an effect, what is the difference, where it was struck by lightning, the melting point is quite smooth, but it is not the melting point that is artificially burned.

This lightning rod, as long as it is Yang Heng's era, people will know the way, but if you want to do it well, then not everyone can know the way, if you use the iron chain as the lightning lead, it will only be used when the god wears the thunderstorm, otherwise ordinary people use it to avoid lightning, the first lightning strike will hit this person into carbon, so, as a lightning protection, you really can't mislead people, lightning rods, leads, and even grounding resistance, that is indispensable, any link has a problem, That's a big problem, that is, in Yang Heng's previous life, the unit with a lightning rod has to test the grounding resistance twice a year, otherwise it will not only not protect the lightning, but also play a counterproductive role, it was originally to protect the building or the equipment in the building, but the grounding resistance is not detected well, it will lead the lightning to destroy the equipment or building, which can be said to be not a common sense that the public can know.

"Well, yes, yes, it seems that these people did what I told them to do." "Owner, you are talking about the place where the iron bar is grounded, I saw it, they wasted a lot of coarse salt, so they poured it into the soil, and even poured water on it, what you ordered, to melt it down, as much as possible, I think they are wasting, you have to punish them well." Ah, yes, maybe when the thunder hits, you hide on the side and shiver, if you hear the sound, you will be even more afraid.

"Owner, it seems that they have really done too many bad things, that thunder, lightning, exploded above their heads, but maybe it didn't reach the point of splitting them, God just scared them, so he didn't split them, but scared us to death, don't God split the wrong one, split it on us."

Yang Heng hadn't asked them yet, so they took the initiative to say it, just to let Yang Heng punish those craftsmen. "This is what I asked them to do, otherwise the chimney will not be broken, you see the stone at the top of the mountain, is it broken, the stone was still very big a few years ago." Yang Heng pointed to a stone on the top of the mountain and said, naturally, there is iron content in that stone, otherwise it would not be struck by lightning.

"Well, yes, isn't it possible that this stone did bad things in the last life, and this world became a stone and thundered." You really think that if this stone had been in the last world, it would have been millions of years ago.

"Xuewen, can you show Lao Dao?" Yuan Tiangang was anxious on the side, what kind of thunder, what kind of stones, this is not something they can know, that is God's business, can it be that thunder can be avoided, this Xuewen is really arrogant, it is better to care about the things in his hands, is this something that can see the stars.

"Attention, Daoist Yuan, this will hurt your eyes, don't look at the sun." "Yes, yes, last time I was looking at the sun, and this eye couldn't see clearly for a few days, why is this so powerful." "You just need to remember, don't look at the sun, and the principle, I'll tell you slowly, okay, Yuan Daochang, this will show you, remember, don't look at the sun." "Okay, okay, learn literature, the old Taoist just listens to you." Yuan Tiangang said impatiently.

"This, I still can't give it to you, a few of you, are there any invalid convex lenses, take one out, and I'll do a test for you to see." There is no way, Yang Heng doesn't want Yuan Tiangang to hurt his eyes, otherwise what if he becomes blind, and that Taoist priest has been guilty, it is estimated that they saw it when the sun was not too bright, otherwise he could still be like this, it was really a big fate, this is a bit exaggerated, at least his eyes will be scrapped.

"Yes, yes, I'll give it to you." "You see it's a piece of wood, I'm going to make it burn." As he spoke, Yang Heng smashed a piece of somewhat rotten wood into a place with his hands, which made it easier to burn, and then pointed it at the sun with a convex lens, focusing it into a small bright spot, which was too bright and a little dazzling, "This can burn, won't it." "Whether it is Li Gang or Yuan Daochang, they are all a little suspicious, but Sun Daochang and the other three Taoist priests, even Xiaoniang Changle, Yu Zhang and others believe in Yang Heng, they don't believe that this can be ignited, but they believe that Yang Heng can ignite it, this seems to be a bit contradictory, isn't it.

"Ah, it's smoking, it's smoking, it's up, it's up." Xiao Niang jumped up happily, what Brother Heng said was really right, even other people also meant this, Yang Heng was really good, and Yuan Tiangang and Li Gang were dumbfounded.

"Could this be the legendary Yang Sui, but it seems that the Yang Sui is not made of crystal, but of a bronze mirror." Sure enough, Li Gang was a little erudite and talented, and he soon contacted Yang Sui, and he didn't know what time Yang Sui was a product of, he actually knew the Tao.

"Professor Li, have you ever heard of this kind of thing?" Yuan Tiangang asked Li Gang in some surprise, why don't you know the Dao, these people seem to know the Dao. (To be continued......)