Once the island-building plan was launched, the entire focus of Gao Feng's work revolved around it. Pen, fun, pavilion www. biquge。 info manpower, financial resources, material resources, all try their best to transport up, that is, the core technical personnel and technical data have also been transported, if you really can't go, the peak wants to run by yourself.

Everyone worked together, and because of the early planning of the peak, things went very smoothly. In half a year, the transportation of personnel and materials was completed, and at this time, the construction of the island was also carried out in batches as planned.

The island's largest resources are volcanic stone and ash, which are the best resources for the production of cement and glass, so one of the main plans is to make good use of this resource.

Since there were no decent buildings in the Tamna Kingdom before, it was necessary to build all kinds of buildings if they wanted to take root for a long time.

Some of these buildings can be made of wood, but most of them are made of cement bricks, which is very helpful for preventing strong winds on the island.

A cement mill was built, and the production of cement from volcanic ash was extremely efficient. This batch of cement will first be used on the island for its own use, and when the construction on the island is completed, it will become a treasure for money.

Cement technology was not made public in the Great Song Dynasty, and it was only used in a few places such as Feng' County, so not many people knew the mystery.

This is the case in the Great Song Dynasty, not to mention other countries, such as Goryeo, Japan and other countries don't even know that there is such a thing.

If the other party is in the dark, it will be easy to do, as long as the idea sells the cement, it will definitely make a lot of money.

The construction of the island is an astronomical amount, and the investment of the Gao family workshop alone is far from meeting the requirements, and the Gao family workshop still has a lot of things to deal with, and it is impossible to use all the money to build the island.

In this case, we have to find a solution, and self-construction and self-sufficiency are the best solutions.

The cement business is one of them, and the other is glass.

Glass products are very sensitive, and even attract strong attention from all sides, so the peak can only come slowly.

The simplest glass products are glass windows, glasses, glass mirrors, etc., but these peaks don't want to do it, what he wants to do is a thermos, that is, a boiling water bottle.

The ancients have been suffering from no better way to keep warm, cellar ice, copper and warm wine are considered a better way to keep warm, as for the insulation of tea and food, but they are not satisfactory.

Of course, these insulation methods are used by the rich and noble, and for the poor, they still use the most direct and simple method, which is now used.

There's a story about hot water. A poor family, one day a friend visited, he hurriedly boiled water, ready to make tea, but there was no tea, so the hostess went to buy tea. The town was far away, and the man waited at home but did not see the hostess come back, so he had to keep adding water to the pot of boiling water. It was almost noon, and the hostess still did not return. The man said to the guest: Don't drink tea yet, you boiled so much hot water, you can take a bath first?

Although this is recited as a joke, it also reflects the difficulties in the life of the ancients, who had to boil for a long time if they wanted to use some hot water, and they were helpless no matter how urgent they were.

Thermos is naturally one of the important ways to solve the problem of hot water, and its biggest advantage is that the cost is low and the water temperature is maintained for a long time.

The thermos is kept warm mainly because of the bottle bladder. The bottle is made of glass, and the inside is plated with a layer of silver, which can reflect the heat into the bottle as much as possible without radiating out; The glass is divided into two layers, and the middle is a vacuum, which can prevent the occurrence of air convection; The stopper is cork, which does not easily conduct heat, preventing conduction from occurring. In this way, the three ways of heat dissipation, conduction, convection and radiation are avoided as much as possible, and their thermal insulation is also reliably guaranteed.

The technical difficulties in making thermos are in three aspects.

The first is to process a double-layer glass body, which has high requirements for molds and processes, but it is not a matter for Gao Feng, and he came up with a simple casting method.

The second is silver plating on the inside of the glass. This is a chemical silver plating method, similar to the production process of mirrors, the method is to dissolve silver nitrate in water, add ammonia and sodium hydroxide solution and dilute into silver hydroxide ammonia double salt to make silver plating solution. Then use glucose, alcohol, stannous chloride, etc. as the reducing solution. As long as the silver plating solution and reducing solution are mixed and immersed on the surface of the glass, a layer of silver film can be formed on the surface.

The third is vacuuming. In fact, this is the simplest, only need to make a pump to complete, however, this is the principle, the real operation is still very complicated.

In addition to the bottle bladder, the thermos also has an outer shell, which is an important part of the bottle to protect the bottle bladder, so it is also very important. It can be processed from plastic or made of wood, its structure is simple, the cost is not high, and there are no technical difficulties.

After the thermos was made, Gao Feng did not consider selling it to Daesong, but sold it to Goryeo.

The remnants of the glass have appeared in the Great Song Dynasty, and there are too many shrewd people in the Great Song Dynasty, in case someone thinks of something else from this thermos, it will involve the Gao family's workshop, and Gao Feng doesn't want to attract so much attention for the time being.

Since the last three ships sent were missing, Goryeo seems to have forgotten about Jeju Island, and they have never sent a single ship, let alone an envoy.

This is the meaning of acquiescing to the independence of the Tamna people, and it is also a helpless approach. Weak maritime capabilities are a common problem in all countries, and Goryeo naturally cannot avoid it.

Don't look at the last time, it only sent three boats over, but those three boats are the top in the country. The three topmost ships all came to an end like this, and the rulers of Goryeo naturally understood that no matter how many ships they sent, it would be in vain.

Jeju Island is a dispensable place, and at this time Goryeo is in chaos, no one wants to go to great lengths to recover a useless island.

This also created an opportunity for Ni Yuchen and others. Goryeo gave up this side, even if he sent people to reconnoitre, he also dealt with it, and he didn't find anything substantial at all. In the hearts of the Goryeo people, the island was still occupied by the Tamna people, so when the ships of the Great Song Dynasty went to Goryeo to do business, they did not behave abnormally.

In addition, Ni Yuchen deliberately let people publicize, saying that the Great Song Dynasty ships had established business contacts with the surrounding areas, including Jeju Island, so it seemed normal for the Great Song Dynasty ships to enter and leave Jeju.

Regardless of whether it is normal or not, anyway, the fleet of the peak is in the name of the Great Song Dynasty, and Goryeo does not dare to do anything with it no matter how much he has ideas, plus the fleet has brought a lot of fresh things, which greatly solve some of the shortcomings in the lives of the people, so they are deeply loved by the people. In this way, Goryeo wanted this fleet to do business.

"It's time to establish some trade channels with the Goryeo nobility." Gao Feng wrote in a letter to Ni Yuchen.