A cart of copper coins, what does this mean, Yang Heng fell into deep thought, and what Eunuch Wang said before, he stayed at ease, as if he had no intention of letting him go back to the countryside.

"Brother Heng, this is great, we can also build a biogas digester in our city residence, so that we can light the biogas lamp." Xiao Niang looked at the copper coin in front of her and said excitedly.

"Biogas, biogas," suddenly, Yang Heng somewhat understood, this is one of his tasks, the cement has been successfully developed, but it has not yet been popularized, and even the biogas digester has not been popularized, in this city that has not been able to build sewers, it is better to popularize the biogas digester first, you must know that in ancient Chinese cities, manure, and some domestic garbage is a big problem, this Datang's Chang'an is slightly better, there are some rivers in the city, but these rivers are polluted, It's not too good.

Yang Heng, how to say it, he was not a planner in his previous life, naturally, for some ideas, he was also a ghost, without any planning, where to think of it, where to do it, but this is better, it seems a little real, and it will not make Li Er too suspicious, otherwise, everything has been calculated, and everything is done in an orderly manner, it is too doubtful, this is a genius, or a demon.

"Brother Da, you go slowly, I still have some things to arrange for you, after you go back this time, not only will you pass on the news of us, but also bring back those goldsmiths, silversmiths and coppersmiths, by the way, don't bring the blacksmiths, they still have their things to do, and, talk to the housekeeper. Let him arrange. Dozens of bags of cement were delivered. That's all, stay safe all the way. ”

In this era, although the biogas digester has such and such shortcomings, it is still a new thing, and it is not advanced, and even has various shortcomings, but if it is not developed, nothing can be developed. Things are often from simple, to exquisite, to advanced, which requires a process, for the ancients, they do not lack wisdom and wisdom, but they lack an imaginary wing, and even have the wings of imagination, but it was artificially broken, which is the sorrow of the ancients.

And Yang Heng does not lack these things. He wouldn't be interrupted by anyone about a thing, just. He doesn't have an idea of unified planning, but despite this, he will still make this era move forward at a rapid pace, and only technology can bring social progress and change people's minds.

Yang Heng's biogas digester in the country father's house is now just a plaything, occasionally boiling some boiling water for people to drink, and most of the time it is used to process manure, most of the biogas produced is burned by the biogas torch, at this time Yang Heng no longer regards this as a lamp, if it is called a lamp, it is better to call the torch appropriate, this flame looks like a torch, and after a long time, it is not so bright, but it is far from the mud head in the previous life, the bulb-type lampshade, and the lamp combined with the glass coverBut the only good thing is that you are not afraid of rain, in the rainy night, it will also be very bright, that is, when the wind is not very strong, the torch is also lit as usual, only when the wind is strong, someone will put a cover on the outside to prevent it from going out, that is, in winter, it will still be bright, but the water can not be burned.

To say that this thing is so good that it can be used, and in Yang Heng's previous life, there are many biogas digesters that are like goods, which should be said from two aspects, one is that farmers do not know this thing too well, which can easily lead to too little biogas production, and the second is that most of the places belong to the task products, that is, the superiors arrange how many biogas digesters each village makes, and in fact, the people who can benefit are not needed for this thing, but they are just hot-headed and made this thing, and the superior will reimburse half of the cost. Naturally, it is also useful to have a good village, which is the real need of the peasants.

And at this time, will it become a kind of goods, the answer is no, first, this thing will become the plaything of the rich, and taking care of the biogas digester does not require the owner to do it himself, only need to arrange one or two subordinates to be responsible, and even Yang Heng will formulate a detailed specification for them, and also give them the biogas digester to ferment in person, or arrange a special person to teach the people, and then the master will only enjoy, there is a light that is lit day and night, and it can handle manure, that is, when the biogas residue is produced, It will not emit too pungent smell, and there are horses and cows in every house, so that the garbage cleaned up after the cattle pen and horse pen are cleaned will be thrown into the biogas digester nearby, and the smell of the home is clean, even the outside of the river is also clean, so that the city is also clean, why not do it.

In particular, biogas residue and biogas slurry can not only fertilize the fields, but can even be used as an insecticide to increase the income of crops.

The only downside to this thing is that it consumes too much copper, because all the pipes are made of copper.

Just like now, a cart of copper coins, Yang Heng actually wasted almost everything by just making a biogas digester. However, this time, Yang Heng also made more things, and the pipeline was longer.

"Xiao Langjun, Xiao Langjun, Your Majesty has come down, and the queen is also here." The day after Yang Heng lit the fire in the biogas lamp, Li Er took his eldest grandson, Changle and Yuzhang to Yang Heng's house in plain clothes.

"Your Majesty, Niangniang, why are you here?" Yang Heng was very puzzled, even if this biogas digester was successfully constructed, you couldn't come so quickly.

"Yang Heng, I heard that you made a new thing, so I came with the queen to take a look." Let's take a look, Yang Heng found that Changle and Yu Zhang were anxious in the back, Changle was looking at Yang Heng, and Yu Zhang was looking at Xiao Niang, it turned out that one was thinking about Lang Jun, and the other was thinking about playmates, they were all used to being comfortable outside, and it was much duller when they went to the palace.

"Daughter-in-law, do you miss me?" Out of nowhere, Li Zhi got out, and then ran to Xiaoniang. "I think, the concubine has seen the prince, the emperor, and the mother." During the period when no one was playing with Xiaoniang, she became a little ladylike, at least she knew what to say on what occasion, "Daughter-in-law, you take me to play, I don't follow my father to see what fun things, what fun things can compare to your daughter-in-law." ”

Hearing this, the eldest grandson shook his head helplessly, this son, Bai taught so much in the palace, this time when he saw Xiaoniang, it changed, that is, the two daughters are not the same, one is because of her husband, and the other is because of her playmate, but if you think about it, this palace is really very depressed, although Yang Heng is not very good here, there is nothing messy, and the two daughters are quite strong, but they are much stronger than before.

"You guys go too, this palace won't restrain you, and if you restrain you again, your heart will not be here with your mother." The eldest grandson said to the two daughters.

"No, mother, we are going to accompany you to visit Yang Heng's fresh things." Unexpectedly, the two women did not listen to the eldest grandson, but wanted to accompany them to visit.

Is this the result of the education of the eldest grandson during this period of time, but the answer should be no, this princess is good to say, how to beautify in the later generations, but the three sons, there is no beautification, in the later generations but everything has been analyzed many times, although the premature death of the eldest grandson is a reason, that is, she does not die, her three sons still have to fight in a mess, this belongs to the nature of the heavenly family, the heavenly family has no family affection, not an empty word.

There is only one seat, that is, the sons who are not born to the queen have to compete for it, not to mention the three sons who were born, that is, Li Er died a little late, this prince is impatient, this is still a father and son, not to mention a brother. It is inferred from this that the son's education is not good, and naturally the daughter's education is also poor, that is, their endurance is a little strong. Therefore, Yang Hengcai believes that some of the statements of later generations are all beautifying or even speculating. (To be continued......)