Yang Sui is made of copper, and the sun is fire, which is the Yang Sui recorded in ancient books, in fact, it is just a concave mirror, and it is a concave mirror made of copper, it is the use of the principle of reflection to make fire, that is to say, put the special moxa on the focus of the concave mirror reflection, facing the sun, and soon ignite the moxa.

However, this kind of Yangsui record is only recorded in ancient books, and then the Song Dynasty in the later generations of Zhilu Dao had a record of Yangsui again, but Yuan Tiangang didn't know that Lu Dao was also a rare thing, maybe he was not interested in these things.

That's right, take fire, take fire, it's too difficult to make fire in this era, even Yang Heng doesn't know how long he hasn't carried the bow for fire, it's too ugly, he carries a bow for making fire all day long, as if Yang Heng likes to eat, then, there is, fire sickle, it's fire sickle, thinking of Yang Sui, naturally thinking of fire sickle, you must know that Yang Sui (at that time it was called cloudy day sorrow) and fire sickle are the most popular things when matches still need to be imported, especially some old smoking guns, they will have a cigarette pouch, a cigarette pack, Then hang an impotence on the cigarette pack, or a fire sickle, when you want to smoke, you will use the yang flint to reflect the sunlight into the smoke pot to light a cigarette, and the smoke will be mixed with some charcoal of the hemp stalk, which will be easier to ignite, or use the fire sickle, that is, two iron pieces, with one to knock the other, make a spark, and then the spark also falls on the charcoal of the hemp stalk, and it is ignited at once, it is said that this kind of charcoal is the easiest to catch fire, a little spark will ignite, the same wormwood also has this effect, It seems to be worse than the charcoal of the hemp stalk.

If you think of it, you can do it, why not invent matches. This requires some chemical raw materials. You need to wait for a few Taoist priests to develop it slowly. Now let's replace it with a fire sickle, this ignition equipment also has a gradual process, isn't it, besides, it is to make matches, which is very expensive at first, but it is not something that ordinary families can use, and there is still a big market for fire sickles.

It just so happens that the next place to visit is the blacksmith's place. When everyone was visiting the tall chimney and the red molten iron that flowed out, Yang Heng had already pulled a blacksmith aside and told him about the production of the fire sickle, to say that the fire sickle Yang Heng had never seen it, but he had just heard the old man's dictation, it was said that the person who was particular about it would have a bag, and there was a fire sickle in the bag, as well as flint, and even mugwort, when it was needed. Take out the fire sickle flint velvet from your bag and light the fire. Put the velvet in the place where Mars is the most, as long as it is ignited, and it will not be used, it will be beaten many times before hitting, but those poor people, there is nothing to pay attention to, it is a piece of broken iron, a stone, and then a bamboo tube or an iron tube with velvet or charcoal, it's that simple.

"Ah, Xiao Langjun, this, it's so easy to ignite, I have also found that when you touch a stone with an iron piece, it will cause a spark, but why didn't you think of using this to make a fire, it's really a pig's brain." As he spoke, he began to beat his head, whose action is this, ah yes, when the little lady trains people, they often say this, maybe they are inadvertently learned, not that this craftsman knows that the brain is used to think, he just thinks that this is the meaning of scolding people stupidly, and he uses it on himself here.

"Okay, okay, I didn't say you're a pig brain, if you're a pig brain, I'll still use you, you'll definitely have your invention, now let's do what I need." Yang Heng didn't expect that it was his words that would inspire a senior craftsman. This means that it is better for people to be more motivated, and maybe when he will give you a glow.

"Xuewen, come here, here, His Majesty the Emperor knows that you can make steel like this, I just asked the craftsmen here, and they said that the output here is very high, but why doesn't this way appear in the outside world?" Old Li Gang questioned Yang Heng again, he is really a loyal minister, but you don't want to think about it, can Yang Heng let Li Er know the truth, there are Li Er's spies and guards all around, what can escape Li Er's eyes.

"Professor Li, this is still in the test stage, the steel is not very stable, even this blast furnace is also improving, and there are some impurities in the molten steel, which is much worse than 100 steel, so it is not yet the time to dedicate it to His Majesty, even the molten steel that comes out can only be made into some steel bars to make building materials, and cannot be used to make other utensils." Yang Heng's explanation is a little pale, but Yang Heng really has this idea, since it is a research institute, it is necessary to study some public supplies, not waste products, look at the red appearance of this molten steel, but there are really a lot of impurities in it, that is, in the previous life, the finished steel could not meet any international standards, but the current steel is not up to the standard of the soil blast furnace in the previous life, so let the craftsmen continue to study, Yang Heng is not afraid of investment.

"Oh." Li Gang's eyes were full of confusion, Yang Heng couldn't see it, if he didn't explain it clearly, Li Gang would definitely have an idea in his heart, "Come on, bring a knife." "It's Xiao Langjun." Soon someone pulled out a knife. "Isn't that great, it looks sharp." Lao Li Gang was even more confused, such a good knife, where are the shortcomings.

"You, you use this knife to gently knock on the stone on the side." Sure enough, Lao Li Gang took the knife and knocked it down on the stone, and the knife was broken into two at once, didn't it say that there was a forty-fifth steel? Naturally, this is also a small batch of steel, and it can't be produced in large quantities, so it can't be found anywhere with 100 steels, which is also the reason why Yang Heng needs to study how to produce in large quantities.

"Xiao Langjun, it's done, it's done, you see it's really easy to use." The craftsman who made the fire sickle ran over, shouting as he ran, holding a piece of iron and a stone in his hand.

"Run slowly, run slowly, don't fall." No way, this person is excited, how can he be like a child, there are no roots under his feet, what if he falls, there are some molten iron here, then falling is a big deal.

"Xiao Langjun, look at this," he said, he knocked the iron on the stone, and then a beam of sparks went straight to the velvet in his hand and, poof, a beam of flame ignited, velvet, where did he come from.

"Xiao Langjun, are you questioning this velvet, this is actually the moxa that we usually use for moxibustion, when I made this fire sickle, I was also thinking about how to find the velvet, but when I found this moxa, I tried it with it, and it was done."

This is naturally the credit of Sun Daochang, usually these craftsmen will have such and such diseases, when Sun Daochang came to the valley, they came to seek medical treatment, and then Sun Daochang taught them to use moxa, as well as the method of making moxa, but the mugwort they made is not so qualified, it can be used as velvet but it is first-class and easy to use.

At first, everyone didn't take this craftsman's shout seriously, and some people wondered, why are the people here so nervous, they are all a little suspicious of Yang Heng's vision of choosing people, and even think that Yang Heng's investment in research is too high, and they want to support Yang Heng, but when they saw the flame in his hand, they were all stunned, just like that, they created such a thing, just now they saw Yang Heng talking to this craftsman, and even saw that the things in this craftsman's hand were so simple, Naturally, I don't think that this is an item made very early, and it is also an item for fire, as if this thing is very simple, just a dozen, and then a flame will ignite, which is much more difficult than drilling wood for fire, you must know that the road, drilling wood for fire, not everyone can succeed, if people who are not very dexterous can not drill out of fire, only smoke, not fire, can live to kill people in a hurry.

For a while, everyone turned around in their hearts for this matter.

Seeing everyone's expressions like this, Yang Heng also felt funny, he really didn't understand people's needs for fire, especially him, he was very proficient in using the fire drill, and he could take out the fire almost within a few minutes, and he didn't feel embarrassed, and he was very interested, maybe he wouldn't be interested after a long time.

"And how many more of these stones, and velvet." "Hui Xiaolangjun, there are still a few pieces, there are a lot of velvet, we have done a lot in order to make mugwort, but we can't achieve the effect that Sun Daochang did, but this ignition is not bad." Well, make such a set of fire sickles for everyone present, and find someone to make a few bamboo tubes, all of which must have lids and spin wires, and the carpenter will do it, and then put the velvet in the bamboo tube, and the fire sickle and flint will also be drilled into holes, and strung with ropes to facilitate carrying. (To be continued......)