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Cao Tong was pulled into the house by Tang Yi, and the house had been basically completed. www.biquge.info He found that there was also a cowhide pipe in the house that was connected to the roof, and from the roof it was divided into several thin pipes and hung down. Underneath one of them was a middle-aged man standing with a glass utensil.

Cao Fu couldn't help but be stunned when he saw the man...

"Dong Quan? Why are you here? ”

As soon as the man turned around, he saw that it was Cao Fu, and hurriedly stepped forward, "The old master is also here?" ”

Cao Tong and Tang Yi were both stunned.

"How.... Know? ”

Cao Fu smiled helplessly, pointed at Dong Quan and said, "This is the old craftsman in our Cao family's gold and jade shop, how can you not know him?" It's Da Lang, this is to inlay the academy with gold and jade, why did you call the goldsmith here? ”

Tang Yile, "It turned out to be my own person, haha, that's just right." ”

He didn't say why he called the goldsmith here, but said to Dong Quan: "Are they all installed?" ”

"Load it up, and then Tang Gongzi will come by himself."

"I'll do it." As he spoke, Tang Yi asked people to pick up the glass utensils in Dong Quan's hand to the roof and fix them, and connect them to the cowhide tube.

Cao Tong looked closely at the glazed utensils, a bit like an upside-down lantern flower, a copper plate in a square circle of rulers was upside down with half a round ball made of glass, and it could be seen that the ball was a porcelain column followed by a copper pipe, leading to the copper plate, and connected with the cowhide pipe.

After the helper was ready, Tang Yi climbed onto the shelf, and when he twisted the glass ball in his hand, he removed the cover.

He handed the cover to his servant, took another piece of gauze, lifted it under the copper plate, and fiddled with it.

The gauze was not only one in Tang Yi's hand, there were many of them, and they were placed on the side.

Cao Tong picked up a thin look, which was a net made of coarse cotton yarn, which was not large, but it was connected together in the shape of a bucket. Except for the openings at the top and bottom, the only difference is that there seems to be a layer of ash attached to the gauze.

Tang Yi tied one end of the gauze to the porcelain head, and tied the other end tightly.

"That's it! Connect the tubes. ”

A subordinate pulled out the cork at the end of the pipe that led to the house from the outside, and quickly connected it to the pipe in the house.

I saw Tang Yi take the fire wax in the mercenary's hand and directly set the yarn net on the one he had just put on...

There was a soft sound, but I didn't expect the flames to be small, and it almost burned Tang Yi's hair.

Tang Yi was also taken aback, hurriedly mobilized a trapdoor on the copper cover, and said secretly in his heart: "We're afraid that the pressure is not enough, but I didn't expect it to be so much!" ”

Cao Tong didn't know so he was wondering, is this a lamp? But it's not bright, what can that little light basket-colored flame shine on?

But no, strange things happened right after.....

The gauze was blown into a ball by the fire, but as the cotton yarn burned out, it shrank into a 'gray bead', and then...

Then the pale blue flames turned white, so bright that people couldn't look at them directly!

Tang Yi was happy in his heart, and this was done.

Buckle the glass cover back and happily jump off the shelf.

"Immortal Chief, how about looking at our lamp?"

Cao Tong looked at the glass lamp on his head dumbfounded, and said in his heart, how can it be so bright? Even in the daytime, it can be so dazzling, and at night, you can't make the house as if it were daytime?

"The end is magical!"

Tang Yi was naturally happy to get the compliment, and asked people to install two glass lamps on the roof.

Cao Tong stared at the glass lamp, "This thing is good, go back and ask someone to install it in my house." ”

"Two hundred yuan a lamp, money before goods!"

"Two hundred!?" Cao Fu jumped straight to his feet. The heart said, why don't you go and rob it!

"Expensive?" Tang Yi pouted, "Two hundred times is a friendship price!" Do you know how hard I put into this!? ”

For this broken lamp, Tang Yi really worked hard for his father.... I started thinking about it from the ship that came to the capital, and it was not completed until today.

This lamp will be placed in the future generations, as long as you have lived in the countryside and used the biogas digester, you will know that this is called a biogas lamp. The principle is very simple, and the workmanship is not too complicated. However, in the Great Song Dynasty, it is simply a major technical problem, and it can win the Great Song Science and Technology Progress Award or something.

First of all, the problem of air tightness and pressure of the swamp pond, Tang Yi found a bricklayer, blacksmith and lacquer maker to build a waterproof and airtight pool, and set up a water tank outside the biogas tank to increase the pressure of the pool.

Then there is the more difficult, and it is also the problem that Tang Yi has been stuck for the longest time - the trachea.

This is not a problem in later generations, rubber pipes and plastic pipes are all over the street, but it took a lot of effort in the Northern Song Dynasty. Tang Yi found carpenters, lacquerers, leathermen, and tailors, and finally found a kind of air-insulating material - the inner membrane of cow intestines.

Fish glue was glued into a thin tube like a condom, a layer of soft cowhide was put on the outside to prevent damage, and a layer of tree paint was sealed, and finally the cowhide tube used today was made.

After that, the body of the biogas lamp was built, and the glass cover was ordered by the merchant who invited the big food. The porcelain clay nozzle was fired by Tang Yiwo in the Huishan porcelain kiln for five days, teaching the kiln workers to burn it by hand; The copper pipes, valves, and intake valves, which are a little more precise, are hand-punched by the best goldsmiths in Bianjing with a small hammer little by little. Even that small piece of gauze was specially woven by a weaver.

After careful calculation, this lamp used bricklayers, blacksmiths, carpenters, lacquerers, leathermen, tailors, goldsmiths, and porcelain makers!

The craftsmen of the Great Song Dynasty used it almost all over!

......

Cao Tong doesn't care as much about whether it's expensive or not, and our Uncle Cao Guo is not bad for money!

Looking at the glass lamp on his head, Cao Tong pondered, this lamp is still too simple, if the copper cover is replaced with gold, and then inlaid with jade, the glass cover is nothing special, it would be better if it was painted with color....

This lamp has no smoke, and it is extremely bright, it is simply designed for people like him who love to enjoy, except for the trouble of lighting the lamp and changing the oil every day...

Wait a minute!!

Cao Tong suddenly felt that something was wrong, what kind of oil to change, it was not an oil-burning lamp at all....

So what is this lamp burning???

"Da Lang.... What treasure is in that pool outside? What is this lamp burning? ”

"Baby?" Tang Yi smiled.

"Come with me, I'll take you to see the baby!"

After speaking, he led Cao Tong to the back of another house, where another pool had been built and there was no 'material'.

I didn't know if the biogas digester would work, so Tang Yi only took one pool for testing. Now that the light is on, the other pools can be refilled.

Cao Tong took a closer look, and almost didn't smoke it! I saw that the pool was full of human and animal feces, urine, leftovers and other disgusting things, it was simply stinking.

"It's... This... It stinks too! ”

Tang Yi smiled, "It's stinky, didn't you praise our lamp just now?" ”

Cao Tong exclaimed: "That's what the glass lamp burns?" ”

"No, to be precise, the biogas lamps light up the 'stench' emitted by these things."

"Stink? Can smelly lights also be lit? ”

"That's right! These wastes are added with water, and when sealed and at a certain temperature, something similar to swamp miasma will be generated, so it is called biogas. And that's what the lights in the house burn. ”

Cao Fu interjected: "Da Lang uses a lot of manure in this pool. ”

The implication is, where do you get so much dung? There is not enough fertilizer in the field.

Tang Yi waved his hand, "Don't be afraid, wait for a few days, everything will recover, and any pigweed, straw, reed, and wheat stalk can replace manure." And the gas output is not worse than manure at all, and the amount of fertilizer is larger! ”

"Fat!?" Cao Fu's eyes lit up, he thought that this thing was consuming fertilizer, but it turned out to be able to accumulate fertilizer.

"That's right, Fat! In addition to lighting lamps, this pond can also be used to light fires and accumulate fertilizer. When this pool is finished, all that remains is the best fertilizer. ”

"And how long will this pool last?"

"About three months.! Considering the simplicity of the workmanship, there must have been some loss, but if it is only used for lighting, it should be fine for three months. ”

Cao Fu was overjoyed when he heard this, and gave Cao Tong a look.

Cao Tong smiled knowingly, turned his face to Tang Yi and said, "Da Lang.... Let's do business......."

....

Tang Yi also smiled when he heard this...

teased: "Two hundred is not expensive, right..."