After the meeting, Roland left Barov alone. Pen Fun Pavilion wWw. ｂiquge。 ｉｎfo

"As you can see, the current chemical laboratory is staffed, the Greycastle Industries is staffed, and I plan to produce soaps and perfumes on a large scale, which also requires a lot of manpower. The prince said bluntly, "When most of the townspeople pass the primary education assessment, they will get at least next year, and there will be only six or seven hundred people when they are full, which is not enough at all." I need more population. ”

"If you are recruited from a fortress......"

"No," Roland interrupted, "next year, when the city is built, the fortress will be connected to the town as a whole, which is equivalent to taking out the money from the left pocket and putting it in the right pocket, and I need more people from beyond the West." ”

"This ......," Barov was a little embarrassed, "I'm afraid it's not so easy to solve, if you go to other cities to get people, the local lord won't sit idly by." ”

"Don't go to the city," Roland said as he put his finger into the cup, dipped some ice water, and gestured on the table, "I don't know if you noticed that the Grey Keep has been at war since the end of the Demon Moon. Several attacks on the southern border, including Tifeko, caused Eagle City to burn and the surrounding villages and towns to be severely damaged. Then came the conquest of the north, depriving Duke Ace of his title and territory for treason. Finally, this sea attack from the east," he slammed the table twice, leaving a cloud of water stains, "and the Sea Breeze County, Golden Harvest City, and Raven Castle were all greatly affected, not to mention the surrounding small towns, and the number of people who fled to the royal capital alone could tell how heavy the losses were." ”

"What do you mean......" Barov gave a thoughtful expression.

"Spread the word about the western frontier," the prince smoothed out all the water, "and in the past six months, only the western frontier has been at peace, and there has been no forced conscription, and it has not been invaded by war. In particular, the first point -- Tifeko's wanton use of civilians to fight will certainly recruit and even kidnap civilians in various places, and no one dares to guarantee that this kind of thing will not fall on him next time, so a safe place isolated from the flames of war is the main point of our propaganda. ”

"I probably understand," he pondered, "that you intend to attract civilians from other towns and villages by promising not to be forced or served, and to provide shelter, food, and stable work?"

"Almost," Roland smiled and nodded, his active thinking and receptivity have always been the virtues of the minister's assistants, "and it is important to publicize the good treatment that can be enjoyed by the literate, and I think there will be some desperate knights and nobles in these places who are willing to try their luck in the West." ”

Whether it is a village or a town, it is almost the domain of a minor noble. If it is in peacetime, no matter how barren the land is and how poor the management is, guarding a few acres of land can always fill the stomach. However, if the population loss is severe during the period of turmoil, life will not be sustainable. At this time, there is a safe place to go, most people should be tempted, anyway, even if the territory is unattended, it will not be occupied by others, and after this time, it is good to go back with money and mercenaries to take over the territory.

As for how to publicize it, he believes that the other party has its own way.

"But Your Highness, in this case, it will be another expense to house these personnel, and the purchase of food cannot be interrupted," Barov hesitated, "and if something happens to the caravan, the city hall treasury will soon dry up." ”

"Hmm...... What you said also makes sense," Roland touched his chin, the most important task of the new political force is to establish prestige and confidence in the hearts of the people, if it suddenly falls into the predicament of not being able to pay salaries, the good situation will take a sharp turn, "In this case, you go back and make a plan first, and wait until the caravan and the town complete the next month's transaction, and the treasury is full before implementing it." ”

"Yes, Your Highness," Barov said with a stroke of his chest.

After giving the task, Roland returned to the office and began to think about how to fulfill Margaery's balloon order.

The unit price of a thousand golden dragons is higher than that of a steam engine, but its cost is much lower, and the airbags are mainly drawn by Soroya, while hemp rope and bamboo baskets are bargains. In fact, Roland had already trialled a simple sample in the courtyard of the Arsenal: a hydrogen balloon that could carry both Lightning and Maisie into the sky at the same time.

After much deliberation, he eventually abandoned the hot air balloon scheme – gas was obtained through dry distillation, the equipment was large, the manufacturing was cumbersome, and the coal had to be imported from other towns, so small-scale production was far less cost-effective than hydrogen.

The prototype was made with a single-sided water coating, and the paper on the back was burned after painting, so that the entire airbag was almost weightless and flexible. In the test, the inflated balloon was not afraid of rain, impact, and fire, and Maisie turned into various birds to pounce on it and peck it without leaving a trace, and only with an iron needle could it pierce the millimeter-thick coating. Due to its extremely light weight, a hydrogen balloon with a diameter of about two meters can carry an adult into the air.

The only difficulty lies in how to solve the problem of filling high-pressure hydrogen cylinders.

DC motors for hydrogen production by electrolysis of water should never be sold, and a single motor connected to a steam engine can inflate all hydrogen balloons, which is obviously not cost-effective. If you want to earn a steady stream of gold dragons from big dogs, you must have high-pressure gas cylinders that can be inflated repeatedly.

The cylinder itself is not difficult, the material is not thick, the wall thickness is not repaired, pig iron and wrought iron are used, anyway, there is Anna, precision machining is not a problem. The key lies in the inflation - the pressure of the gas cylinder in later generations is more than 20MPa, and it is undoubtedly a fantasy to enter it by the pump, and ten unicorn arms are useless, at least you have to use a high-pressure air pump. If the pressure inside the bottle is not enough, it will not be able to fill the hydrogen balloon at all.

The high-pressure air pump is divided into piston compressor and turbine compressor, the former belongs to the internal combustion engine technology tree, the latter belongs to the turbine category, no matter which kind of research and development, it is a time-consuming and laborious project. It wasn't until late afternoon that Roland finally came up with the simplest solution: self-inflating the bottle.

He was inspired by a news story he had seen before the crossing: a street vendor selling hydrogen balloons used modified liquefied gas tanks to store hydrogen, and an explosion led to a tragedy. The reason is that the vendor directly reacts with dilute sulfuric acid and aluminum in the bottle to produce hydrogen, without calculating the reaction amount, resulting in excessive pressure in the tank and directly swelling the tank.

The self-inflating method is to fill the bottle with dilute sulfuric acid and active metals to replace the hydrogen gas. Zinc is commonly used in the laboratory, and aluminium is the most hydrogen produced by equal weight, but neither is available in this era, so Roland still intends to use iron to react - Lucia can separate extremely pure iron elements, and the problem of slow reaction speed at room temperature can be improved by heating and increasing the contact area (such as iron sheets, iron powder), and the coating can resist the corrosion of the bottle by acid.

With this in mind, he immediately drew a simple sketch on paper - in order to reduce air leakage, the high-pressure cylinder should be as single as possible, so that the bottle is completely integrated, leaving only a raised threaded hole at the top, which can be screwed into the valve with a valve.

After the reactants are injected through the hole, the nozzle is tightened, and the resulting gas has nowhere to go, and the pressure inside the bottle can reach a very considerable value. When used, as long as the valve is unscrewed, hydrogen will gush out and rush into the air bag. It is also very convenient to re-flush, remove the air nozzle, dry the water, clean out the ferrous sulfate crystals inside, and then pour the reactants again.

Considering that dilute sulfuric acid is also an alchemical product, it is obvious that the price of inflation cannot be set too low.

It's set at fifty golden dragons for one charge, and ten for one charge, Roland thought. (To be continued.) )