Whether Li Yuanjia thought too much about it or not, but because of the coal incident, his good impression of his nephew Li Tai deepened.

Before, it was because of mathematics, but this time it was because of the other party's strong curiosity.

Coal [Bayi Chinese www.x81zw.xyz] charcoal, there are not many people who are really interested.

In addition to the fact that not many people know about it because of its small reputation, the key lies in a cost issue - for the vast majority of people, the existence of coal does not make much sense, it is too expensive!

CoalCoalCoal is made from coal.

In terms of the technology of this era, even with the existence of Li Yuanjia, it is already very exciting for those craftsmen to burn charcoal, and it is impossible to expect them to achieve low-cost, large-scale production in one go.

And the price of coal alone is much more expensive than ordinary firewood.

After all, the so-called "firewood" is cut or picked up by poor people, and there is almost no cost, but the coal has to be dug up from the coal-producing land and then transported to Chang'an from outside......

If it weren't for the coal stoves, I'm afraid it would be difficult for coal to become popular.

It is only because of the appearance of the coal stove that water can be boiled on it at any time, and the harm of "charcoal poison" can be greatly reduced after adding a chimney, which makes the magnates of Chang'an like this thing. Anyway, for them, the price of coal doesn't care at all, and the iron used in a coal stove is nothing.

But for ordinary people, a coal stove alone can make them despair!

In the ordinary peasant homes of Datang, a sickle is extremely precious, and it will definitely take a long time to hit a kitchen knife, let alone such a large coal stove.

So from the very beginning, the coal stove was aimed at the officials and the rich.

Promoted among the general population?

Hehe, Li Yuanjia never thought about it!

In addition, it takes a complex and painstaking dry distillation process to change from coal to coal, so that it can barely be made into mediocre coal.

So if you sell it, coal is probably much more expensive than charcoal.

This is the difference between an agricultural society and an industrial society, anyway, in Li Yuanjia's memory, charcoal was the most expensive in his previous life, especially the best fruit charcoal, which was sold by catties, and it was one of the major expenses if it was used for barbecue. But in Datang, the first wood is not valuable, as long as you have the strength, you can cut it casually; Second, manpower is not valuable, and the charcoal sellers ask for nothing more than food and clothing.

On the contrary, the coal has to be transported from other places, and the conditions for burning coal are much higher.

At least for now, or for a long time in the future, the only user of coal will be Han Wangfu! Because only here do you need a lot of burnt sand, boil bamboo fibers, and make movable type alloys every day, which requires relatively high temperatures. For others, it is just used for heating, cooking, etc., coal is too expensive, and it is relatively difficult to burn, so it is not cost-effective to use......

Well, that's a long way off.

At the same time that Li Tai was sent this hundred catties of coal, Li Yuanjia also wrote a text message, roughly explaining the benefits of coal - high temperature, durable burning, and can be manufactured in large quantities!

Although the current cost is a little higher, and the quality of the burned coal is also a little worse, Li Yuanjia is now smashing dozens of times into it every month, so that the craftsmen can continue to research, the quality can be improved after all, and the cost will definitely be reduced!

"If that kid is interested, then it would be better to join in!"

When Han Lucheng sent the things and the letter away, Li Yuanjia couldn't help but think: "Although it is impossible to cooperate with Li Tai, I can completely hand over all the technology to him and let him do it!" And...... In my memory, it seems that the emergence of coal is a necessary condition for the great development of steelmaking, and if it can be used, it will not cost much money! ”

Steel!

Steel!

When he thought of the importance of coal to steelmaking, Li Yuanjia was a little excited.

He didn't dare to touch this thing in a short period of time, and he didn't have that strength. But it is hard to burn the coal, how can it not be promoted and let it shine in steelmaking?

And......

Once Datang's steel ...... No, even if the iron production can go up, it will be enough!

Until the second half of the twentieth century, steel production represented the absolute power of a country, let alone the current era of pure cold weapons.

Li Yuanjia is not an engineering student, let alone a military expert, so he has never thought of developing any thermal weapons in the past...... To put it bluntly, he didn't know anything about it except that he knew the general formula of black powder.

But to make Datang's smelting level go further, he is still confident.

As long as there are enough funds, coupled with the talents that the Royal Mansion Academy continues to cultivate, Li Yuanjia feels that he can give it a try after the age of thirty.

When the time comes, if the iron production goes up, it will be combined with Zhancheng rice, bamboo paper, sea salt, tea, glass and mathematics......

Tsk, that picture is so beautiful, Li Yuanjia doesn't dare to think about it!

"The King...... King? ”

"Huh?"

Just when Li Yuanjia was thinking about to be happy, the voice that suddenly came to his ears woke him up from his beautiful fantasy.

Looking up, his cousin Qiong immediately became gentle: "Fengzhu, is there something wrong?" ”

"Hmmm......"

Nodding, Fang Fengzhu said softly with a little embarrassment: "King, I'...... I'm going to the club today, and I won't be back until the afternoon, okay? ”

"Club? Didn't you just go the day before yesterday? ”

After a pause, Li Yuanjia asked with some surprise.

"This ......"

"Hehe, it's okay!"

Seeing that Fang Fengzhu's face was a little embarrassed, Li Yuanjia hurriedly waved his hand and smiled: "I'm not unhappy, it's just a little strange...... Why, more people have come in recent days? ”

"Well, it's quite a few!"

Hearing him say this, Fang Fengzhu's expression immediately relaxed, and he nodded excitedly: "Except for yesterday, more than a dozen people can come almost every day these days!" And...... Didn't Your Majesty come back yesterday? A lot of people said they wanted to bring their friends with them today, and it was estimated that there were at least thirty people, so ......"

"Thirty? So much? ”

Hearing this, Li Yuanjia was stunned for a moment, and his eyes widened suddenly.

What's going on?

What happened?

Although considering that the club has just opened for a short time, the requirements for all aspects have been relaxed, such as knowing some math or something, and learning it after the year. But for ordinary ladies, the conditions of the club are still a bit high, and just one annual membership fee can stop many people!

So in Li Yuanjia's impression, most of the time there should be empty!

Thirty in one breath today, what's the situation?

"Hee-hee, of course it's the charm of mahjong!"

Grinning, Fang Fengzhu said happily: "Everyone likes to play, these days the club is lively, more than ninety percent of the credit is attributed to mahjong......"