Liu Yu took out the mirror and looked at it carefully.
There was a thick layer of black paint on the back of the mirror, which must be the mercury layer inside.
This process of attaching mercury to the north side of glass should have been invented hundreds of years later.
Now that Liu Yu has taken it out, it is definitely another big killer.
"How many craftsmen did this glass mirror use?" Liu Yu asked seriously.
"Almost a dozen people." Ge Hong said.
"Select them all, set up a special mirror workshop, and send the most powerful guards to ensure absolute confidentiality!" Liu Yu said.
"I obey your Majesty!" Ge Hong said immediately.
If glass is considered a high-profit product, it is basically because of the low-cost raw materials. Even if it is sold at a high price, it will not be too high.
Because Liu Yu also plans to popularize the application of glass.
But glass mirrors are different.
Liu Yu plans to turn glass mirrors into luxury goods that are considered to be highly profitable.
At least within a few years, he will sell the mirrors to sky-high prices and rob the rich.
Therefore, the confidentiality of this glass mirror workshop must be maintained at the highest level.
If you really think about it, Liu Yu's secret-keeping methods are not outrageous.
Historically, in order to keep the manufacturing methods of glass mirrors secret, European countries set up factories on an island in the sea and did not allow anyone to approach.
It is precisely through such perverted means that the exclusive secrets of the glass mirror have been maintained for a hundred years.
When Wu Xin, Liu Yan and others heard that the secret of this glass mirror was of this level, they all immediately turned their heads and were unwilling to look at it anymore.
His Majesty the King of Jin attaches so much importance to it. If they accidentally hear any secrets, they will be held responsible.
However, Liu Yu was not so cautious.
"The secret here is not a secret to you. In the future, all profits from this glass workshop will be used to support the army." Liu Yu said.
In this day and age, it is impossible to do business peacefully.
You must have the backing of strong men like Liu Yan and Wu Xin with force, and then you can let people do business with you peacefully.
Otherwise, a group of vicious neighbors would have come to snatch it away.
After viewing the glass workshop, Liu Yu asked Ge Hong to take him to inspect other workshops.
Mainly workshops with manufacturing machinery.
Among them, the fastest progress was made by workshops specializing in the production of various industrial and agricultural machinery.
When Liu Yu and others entered, they could already see many successfully produced mechanical samples on display.
As soon as he entered the door, Liu Yu saw a tall windmill sample.
"Hey, isn't this a windmill?" Liu Yu immediately stepped forward to check.
Ge Hong and others immediately followed.
"Your Majesty, this windmill was just made. Now it can be used as a mill if it is equipped with a millstone. If it is equipped with a water lifter, it can be used to lift water. If it is equipped with a hammer, it can also be forged!" Ge Hong said.
When Liu Yan and others heard this, they all looked surprised.
If it was really that powerful, how much labor would be saved.
"Yes, with this windmill, it can resist drought and do work." Liu Yu nodded.
The key to this kind of wind power installation lies in the design concept.
As long as there is a method concept, so-called one-size-fits-all, more practical machines can be made.
In the northwest region, the most indispensable thing is wind.
If the year-round wind is used to drive windmills, it will definitely turn waste into treasure.
"Your Majesty, if you have this thing, you can give it to the last general ten times!" Wu Xin said carefully from the side.
During his time in Xiazhou, he already knew the hard work of farming in Xiazhou, and getting water was a problem.
If this windmill could lift water, Xiazhou's farmland would never be short of water again.
"Ten units? No, that's too few. I'll give you at least a hundred units when the time comes!" Liu Yu said with a smile.
This kind of windmill water lift will be a powerful tool to fight drought in the future.
Just ten, how could it be enough for tens of thousands of people in Xiazhou?
When I wandered to another workshop, there was an unknown smell coming from inside.
It can't be said to be a simple odor, but a variety of odors mixed together.
Wu Xin and others covered their noses, and Liu Yu did the same thing.
"Your Majesty, here is the newly established fire saltpeter workshop." Ge Hong said.
"Fire salt? No wonder it smells like this." Liu Yu frowned.
The so-called fire saltpeter is one of the three major ingredients that make up black gunpowder.
The mineral deposits of this thing are very rare. If you want to make black powder on a large scale, especially if the output is satisfactory to Liu Yu, the current stock of gunpowder is simply not enough.
Therefore, he ordered an experiment to make a fire and saltpeter pool.
That is, a large amount of human and animal feces is mixed with other things to cultivate high-yield nitrifying bacteria.
Only by keeping these nitrifying bacteria well fed can they produce enough fire nitrate.
"According to His Majesty's instructions, the nitrification tank has been completed, but the output has not increased. Would Your Majesty want to go in and check?" Ge Hong asked.
Liu Yu frowned and said, "No hurry, no rush, let's try it again, I'll talk about it another day."
It smells so bad outside, but you can imagine what it smells like inside.
Liu Yu didn't want to abuse himself.
