There is no hurry to organize an army to go south to Italy, because, according to Archbishop Rovere, it is difficult to install spies in the Borgia family, which is good at conspiracy, and it takes time. After all, the Borgia family is the family that is the most conspiring family. It is indeed necessary to be careful when installing spies in such a family.

Therefore, Archbishop Rovere estimated that it would take one to two years to send his spies to Alexander VI and his son to get the chance to poison him. Therefore, Marin has time.

But in the industrial sector, because artificial high-level reservoirs have been unable to be built, the development of the forging industry has been restricted. Whether it is Old John who casts cannons, craftsmen who make muskets, and those who forge plate armor, they all urge Marin to start building artificial high-level reservoirs as soon as possible.

Therefore, Marin sent his confidants to the secret base for firing cement and urged craftsmen. These craftsmen who firing cement were not experts and scholars, but just serf craftsmen under Marin's control. Originally, these people were just burning bricks and had rich experience in firing kilns.

In fact, these people do something as they are told. But they are really overestimating them if they have to invent and create. The reason why Marin handed over the task of firing cement to them is that they value their identity as serfs and are not easy to leak secrets.

However, these serf craftsmen have limited talent and are slow when studying cement formulas. In fact, Marin has clearly given the ingredients and range of ingredients, so they try to use them, and it is not troublesome at all.

This is true. According to the ingredients given by Marin, they quickly fired qualified cement according to different ratios.

If they only need ordinary Portland cement that is not waterproof, they would have been able to hand in the deal long ago. However, what Marin requires is waterproof fly ash cement that can be used to build reservoirs.

Therefore, they fired more than a dozen different ratios of fly ash cement based on the ratio range given by Marin. Then, they used more than a dozen different types of fly ash cement to build a dock by the beach. Next, they waited...

After all, testing the waterproof effect of cement requires time to wait. In this era, there is no time-saving corrosion resistance test method, so you can only wait.

When Marin sent someone to urge him, the craftsmen went to the beach and carefully observed the cement docks. After all, these docks have been built for several months, and you can see that they have a comparison of the corrosion resistance.

After a day of careful observation, the craftsmen finally selected the best-grade fly ash cement with the best waterproof and corrosion resistance.

Then, it was sent to Marin's desk...

"Huh--it's finally successful, it's not easy!" Marin breathed a sigh of relief. During this period, the craftsmen who urgently needed to use hydraulic forging hammers kept sending representatives to apply for urging, which made Marin feel a little troubled.

Whether it is the medieval craftsmen or the scientific researchers in later generations, they are all a little stubborn. Those scientists immersed in the ocean of science and the great craftsmen immersed in crafts only have careers, and they don’t take Marin seriously, the great Count, seriously, and do not give face at all when they should make a fuss. But Marin has no choice but to use these big technicians. After all, Marin still expects them to serve him. If he is an ordinary little craftsman, he will dare to bare his teeth in front of Marin and will be dragged out and beat him hard. Moreover, people come to make trouble for Marin’s own industrial needs, not for his own treatment. Marin has no way to do anything, so he can only coax him well.

Now that the cement has finally been fired successfully, the plan to build an artificial high-level reservoir can naturally be started...

But Marin hesitated for a long time about where the cement plant was built...

Built near the city of Orich, Marin was sure to resist the covetousness of others and prevent the enemy from obtaining the formula. However, this also explains to the world the secret of "having a cement formula by yourself".

You should know that the role of cement is very strategic. If you use steel bars, reinforced concrete buildings can withstand any shelling of this era and are stronger than stone city walls.

If others know such an important technology, they will not kill themselves to seize it? At that time, they will definitely be unpredictable.

So, Marin finally decided to build the cement factory on the island so that outsiders would not see it...

Moreover, Marin had long thought about it. When cement was publicly in front of the world, he directly called it volcanic ash and lied that it was transported from Italy.

In fact, some volcanic ash does have the effect of cement. In ancient Roman times, the Romans did use volcanic ash to create Roman cement.

The reason for this is that the volcanic ash that can be used as cement has a limestone content and ordinary soil content that is exactly in line with the ratio of cement. In addition, the temperature below the crater is extremely high and the environmental effect is similar to that inside the cement kiln, which naturally creates a unique cement volcanic ash.

In fact, many buildings in ancient Rome used the structure of hydrotonic ash cement. Therefore, this reason is very reasonable. Moreover, in Italy, where there are many volcanoes, many volcanic ash suitable for cement can be found. Of course, because the ratio is too arbitrary, the quality cannot be guaranteed.

Just so happens that the fly ash cement needed by Marin requires a large amount of use of fly ash produced by boiling salt. In addition to limestone and fluorite, it is necessary to send a boat to Hamburg, Bremen and other areas to buy it, and build a cement kiln on the island, which is convenient and hidden.

Moreover, a cement kiln was built on the island. After the cement was successfully fired, it could be shipped to Emden, and then lied that it was volcanic ash transported from Italy...

As for which island the cement plant was built, Marin quickly made a choice - or Baltrum Island...

Previously, Marin had built the new Yancheng on the southwest corner of Baltrum Island, and built a fort there, and sent trustworthy defensive forces.

However, the area required for the salt boiling base is actually not large. The entire salt boiling base only occupies the southwest corner of the entire island with a total area of ​​more than 6 square kilometers.

Therefore, there are a large number of open spaces on the island that can be used to build cement plants. In order to facilitate the living needs of workers, the cement plants were naturally built on the south bank with fresh water resources and the east of New Yancheng in the southwest corner...

Marin selected a group of serfs who were good at burning bricks and sent them to Baltrum Island together with their family to build a standing kiln for firing cement and a house for workers to live in. After the first batch of cement was successfully fired, a large wall was built and cement was applied...

Then, a cement road from the cement factory to the salt boiling center must be laid. Because there is only an excellent deep-water pier on the island.

In the future, the coal required for the cement plant will be obtained directly from the salt boiling center, which is all British coal imported from Newcastle; fly ash can also be obtained in its own stand-alone kilns in addition to obtaining it from the salt boiling center; as for limestone, clay and fluorite, although it is transported from Hamburg and Bremen, Marin did not intend to transport the materials directly to the New Yancheng Pier on Baltrum Island, but first transported them to the Nordon Pier, and then sent a trusted ship to the New Yancheng Pier. Similarly, after cement is produced, it is first transported to the Nordon Port through confidential ships and then to Emden... This can greatly reduce the risk of the discovery of the base on Baltrum Island.

At the same time, Marin will set up a fleet in the future, cruise around Baltrum Island, and sink any ships trying to approach Baltrum Island to protect the secrets of the island's salt boiling center and cement plants.

After arranging the matters of the cement plant and building artificial high-level reservoirs, it can naturally be put on the agenda. Malin asked the craftsmen to choose the reservoir location and arranged a large number of laborers to start laying the foundation. As for the bricks and gravel needed to build the reservoir, Malin also began to send people to place an order. Just wait until the foundation is laid, the cement of the cement plant will start mass production and deliver it to the construction site, and the reservoir can be officially started...
Chapter completed!