It is not like the later generations, the outer frames made of bamboo are more expensive than those made of iron.

"Master Dai, the water temperature is now 95 degrees!"

"Master Dai, the water temperature is now 91 degrees!"

"Master Dai, the water temperature is now 88 degrees!"

"Master Dai, the water temperature is now 85 degrees!"

...

As the assistant kept reporting, Dai Quan slowly smiled on his face.

After filling the hot water, it was still in the seventy degrees after four hours, which is already a very good data.

After eight hours of filling, it can still maintain more than 40 degrees, which basically does not affect everyone's drinking hot water.

As for the water temperature after twelve hours, it is normal.

You should know that the temperature outside is now several degrees below zero.

Under normal circumstances, the water in the thermos bottle can last for eight or nine hours is basically enough.

What is better is that it can only be improved continuously in the future.

Although the vacuum extraction equipment has been greatly improved, it is obviously not enough to achieve a complete vacuum.

Then whether the silver plating process has been optimized is something that needs to be continued to be optimized.

However, it has not affected his decision to bring this thing to the market now, and he will definitely report good news to Li Kuan specifically.

...

"Your Highness, this is the thermos specially produced by the glass workshop and several other workshops. I have confirmed that the insulation effect is better than any previous method.

In each yamen, as long as someone is responsible for boiling water in the morning and filling all thermos bottles with water, it can basically meet the needs of most of the day.

If necessary, whoever changes at noon will be enough for one day."

Dai Quan is an old man around Li Kuan. He has developed a new product and will naturally see Li Kuan immediately.

But other craftsmen have achieved the same results and it is very difficult to meet Li Kuan directly.

"Thermos? Did you actually get the thermos?"

When Li Kuan saw what was in Dai Quan's hand, he immediately took it with curiosity.

Although the outside of this thermos is a bamboo-woven basket, it is different from the thermos that Li Kuan had come into contact with in his previous life.

But the overall appearance is still very familiar.

In addition, Dai Quan had already said that this was a thermos, so Li Kuan naturally understood it in seconds.

“Yes, I saw a paper about heat transfer in the Journal of Science some time ago, and then I got inspiration.

After several months of attempts, we finally got the finished product today.”

Dai Quan smiled happily on his face.

As the earliest eighth-level worker around Li Kuan, Dai Quan's income is definitely much higher than that of ordinary small businessmen.

In addition, Li Kuan rewarded him with a house in the Workshop City, so Dai Quan could basically be said to have no worries about food and clothing and financial freedom.

At this time, he made some different results, which was what he was more interested in.

"How did you make this thermos, and why does it keep it warm?"

Li Kuan probably knew that the inner liner in the thermos bottle was made of glass, and he didn't know anything about the others.

Who would deliberately think about why this thermos can be kept warm when holding the thermos?

"It is mainly achieved through two points. The first is to reduce heat conduction. This is by firing a special double-layer glass bottle and then vacuuming the space between the two layers of glass using special equipment, so as to minimize the loss of heat.

The second method is to plaster silver on the inner wall of the glass, which can also reduce heat radiation.

Judging from the current experimental results, it is still very good.”

Dai Quan's joking manner made Li Kuan feel that he was a time traveler.

However, Li Kuan was very happy to invent something new without his own guidance.

To be honest, such a thing is really in line with the needs of the people of the Tang Dynasty.

Of course, the early thermos was definitely not something that ordinary people could afford.

However, the noble families of the Tang Dynasty have earned so much money over the years, and now they have no problem getting back with some money.

"If you can apply what you have learned, your invention can be selected for next year's Tang Dynasty Royal Science and Technology Award.

Can it be produced on a large scale now? Let Wang Fugui help you coordinate and push out the thermos as quickly as possible.

First, we will make an advertisement on the Datang Daily, and then immediately start selling it in the Treasure Pavilion, and the price can be set a little higher."

Starting from small things, we will continue to improve the living standards of the people of the Tang Dynasty.

This is the direction Li Kuan is pursuing now.

The thermos bottle produced by Dai Quan is obviously in line with this direction, so he naturally needs to support it.

"Your Highness the Prince, don't worry, the glass workshop has started mass production yesterday, and you can get it in the Treasure Pavilion in two days!"

Hearing Li Kuan's affirmation of him, Dai Quan felt that he suddenly became several years younger.
Chapter completed!