The two ministers, who had been quite personable, now abandoned their reserves, and groped around the unusually warm room with wide eyes, hoping to find the secret to keeping this place warm in cold weather without open fire.

The well-informed Joseph also studied on the surrounding walls, hoping to see special magical symbols in the crevices to explain the reason for this magical house.

He had the impression that this kind of magic was also very likely, and some of the great nobles would also use extremely expensive energy magic stones to maintain such a heating system in order to satisfy their own enjoyment.

As one of the insiders, he understood that the magic stone of energy supply in the northern fortress might not be a very high-level thing.

Just thinking that these energy supply magic stones that could have been sold for a lot of money were used for heating in this kind of place, the purpose was just to keep one homeless household, and if a few homeless people settled down, they would have to provide several times more than the current configuration, and he had begun to use the usual benefit measurement of businessmen to start thinking about it in his heart.

"Lord, this can't really be a new type of magic device, can we?

In order to make the lord more clear about what he meant, he hurriedly added: "The fee I said is based on the usual price on the mainland, not according to the special situation on our side. ”

After this call, he almost didn't directly say that he felt sorry for those energy supply magic stones, and he clearly understood that the mine would be finished one day.

If we start to build a dependence system of energy supply magic stones from all aspects of life on a large scale now, then when the energy supply magic stone ore source is exhausted in the future, these seemingly convenient things will soon bring new disasters to the northern fortress.

Either way, he felt it was necessary for him to ask his lord to think about the risks, and by the way, to warn him to be wary of such things happening.

Duke laughed heartily when he heard his words, and he shook his head and said, "Don't think so complicated. Let me remind you, have you noticed that the space inside is a little cramper than the outside?"

After Duke's reminder, Vlavic, who was closest to the gate, immediately understood.

He first looked around the room, then hurried out of the doorway, retreating far enough to see the size of the house.

Then he ran in and carefully compared, and this exercise made the old man a little unbearable, panting heavily, but his eyes became brighter and brighter.

"I found that the walls around the interior were reduced by about a palm's width to varying degrees compared to the outside, could it be because of the thickness of the walls made of cement?"

After some observation and comparison, Vlavich asked curiously.

"The answer is relatively close, in fact, the real reason is because the extra thickness is hollow inside. ”

Duke was still sitting in the main seat, eating refreshments for a long time and unhurriedly, while returning to Vlavic's question.

"Hollow?"

"Yes, the lord told us to make the house hollow around the perimeter, and then we buried some pipes, and we put heat in the pipes, so that we would soon have a warm house in the winter. ”

The anvil on the side also smiled at this time to help Duke answer the questions of the two ministers, after all, he himself participated in the design of this house, and many of the suggestions in it were changed at his suggestion.

"That's a good idea. Suddenly realized, Joseph shook his hand, knocked on the walls around him in amazement, and gently stroked the warm sensation from above with his palm.

However, in order to continuously deliver heat, it is necessary to keep burning fires, and it seems that the amount of firewood consumed in this way does not decrease much, but it is only a collective burden that needs to be borne by individuals. ”

After a moment of amazement, Vlavich immediately thought of another, more realistic question. The current situation seems to be that the energy supply gems that were previously thought to be consumed have been turned into firewood, or gold coins.

It's not too low, and it can be done in the current Duchy of the North when it has a relatively stable income, but if the cement business suffers a downturn, it may soon be unsustainable, which is very different from the sustainable model that Duke said at the beginning.

Therefore, he had to ask his questions inappropriately when everyone was immersed in a happy atmosphere.

"Haha, in the past it was true that we needed to use firewood or some other heat source to provide energy, but now we have a new machine that can do this with much less energy than before. ”

The question happened to hit Anvil's proudest thing lately, so he quickly began to answer Vlavic's question, but the other party had no idea what he was talking about, and was still confused.

So he went on to explain: "What I'm talking about is called a steam boiler, and we say that we are making a new product after the simple steam engine that the lord said, it can be used as a stable and convenient heat source for heating, and with some proper enchantment of the boiler, then its efficiency and effect will become even more powerful!"

Then he said a lot of professional terms about steam turbines, expansion tanks, superchargers, etc., which made Vlavich and Joseph even more confused, and finally Joseph could only summarize it simply and rudely: "It means that there is a lot of money left, right?"

The anvil that was in the middle of the conversation was interrupted by Joseph's big boss, and he couldn't help but lose the interest in continuing, so he could only say helplessly: "According to the current experiment, it only costs one-third of the original cost of burning firewood, and you have also felt it on the spot, and its effect is much better than expected." ”

Now the two ministers, who had been thinking about the cost, were finally able to put their minds at ease, if only one-third of the original cost was needed, even if they were financially constrained, and Anvil also said that if there was enough time, they could continue to reduce costs, which made this model even more tempting.

"Okay, now that you understand how this house works, do you think this can be put to use?"

Seeing that both ministers were beginning to look thoughtful, Duke asked what they thought after understanding the whole preliminary framework.

It was Vlavic who reacted first, and immediately replied after hearing Duke's inquiry: "I think this placement method is completely feasible!"