Sky Curtain: My Great Qin must have an aircraft carrier!

"Your Majesty, shall we use Widow Wang's clothes?"

Several old craftsmen from the Imperial Workshop stood below the hall, each with a troubled expression.

Although the Sky Curtain Sect's teachings have never been wrong, these names just don't sound right.

What if they just have certain preferences?

If these two things are missing, and the product turns out to be different, who can take responsibility?

After hearing this, Li Shimin couldn't help but laugh out loud: "Don't be so stubborn."

"That principal was clearly saying nonsense on purpose to discourage ordinary people from secretly learning the craft."

"Use whatever filter cloth is appropriate, and have it fired in the best official kiln in our workshop."

The old craftsmen breathed a sigh of relief; they no longer needed to bother the widow, making the work much easier.

Just as the emperor and his ministers were discussing matters, the scene on the sky changed.

After the principal put the crucible into the kiln, he started heating it with a hairdryer in his hand.

The image was so abstract that comments immediately started appearing on the screen.

(Principal, what did people do in ancient times without hair dryers?)

The principal ignored the comments and took out the red-hot crucible.

[The ingredients have now melted. Next, find your super-powerful dog-beating stick and start stirring like crazy!]

The principal picked up a clay stick from the side and dipped it into the molten glass, drawing circles in it.

Remember, the dog-beating stick must be made of clay, otherwise it will contain impurities!

Next, a miracle was achieved by force, and all the air bubbles in the molten glass were expelled.

The more thoroughly you stir, the clearer the glass will be.

Remember, be quick and stylish!

Under the celestial canopy, countless people across different times and spaces scratched their heads, sinking into deep self-doubt.

"My great-grandmother didn't have a dog-beating stick, she used a broom..."

"We do have a dog-beating stick at home, but it belongs to my third great-uncle."

"What do we do then? Without stirring it with a dog-beating stick, is it all ruined?"

"How about I go home and break my grandpa's cane?"

The people were discussing it animatedly, all wondering what exactly the significance of the "dog-beating stick" was.

The Beggars' Sect disciples straightened their backs, feeling that they had gotten a great deal this time.

After stirring it around for a while, the principal poured the molten glass into the iron mold.

The final and most important step: annealing!

Many beginners find that when they polish glass, it cracks into eight pieces as soon as it cools down because it hasn't been annealed.

If you get blinded by the explosion, don't blame the principal for not warning you.

We dug a pit half a meter deep in the yard and lined it with a layer of unused sand.

Place the glass mold inside, cover it with a layer of hot sand, and leave it for three to five days before removing it.

The principal took out a piece of glass and flicked the edge lightly with his finger.

Ding--

A crisp, melodious sound traveled across the land through the sky.

Alright, the hand-rubbing of glass is a perfect ending, get out of class dismissed!

After a brief silence, the entire land of China erupted in thunderous cheers.

"It's done! Glass! Transparent glass!"

"Long live the principal! Long live the bald principal!"

"I'm going to be rich! I need to find some salt ash right now!"

Countless people rushed out of their homes, spreading the news far and wide.

After the curtain of heaven fell, people from all dynasties got busy.

Xianyang Palace.

Ying Zheng sat high on his throne, looking down at the bamboo slips that had just been written on the jade table.

The secrets revealed by the celestial canopy were far more tangible to him than the wonders of later generations.

He stepped out of the main hall, the cold wind whipping up the hem of his black dragon robe.

In the distance, Mount Li disappears into the clouds, and the territory of the Qin Dynasty unfolds in the field of vision.

"Li Si, issue an imperial edict to the Imperial Household Department to mobilize artisans from across the land to dedicate their full efforts to the research and production of glass, following the methods taught by Tianmu."

"All those involved in the production, along with their entire families, were moved to the secret camp at Lishan."

Ying Zheng paused briefly, then his tone turned chilling: "Anyone who leaks even a single word will have their entire family exterminated."

Li Si prostrated himself and kowtowed, not surprised by Ying Zheng's decisiveness.

Such a crucial instrument, which concerns the fate of the nation, cannot afford the slightest mistake.

And in Chang Le Wei Yang.

For the first time ever, Liu Bang did not indulge in drinking and merrymaking; instead, a glint of shrewdness appeared in his eyes.

"Get a few men for Nai Gong to go to Guanzhong to find saline-alkali land, and also collect a batch of borax."

Zhang Liang chuckled and asked, "Your Majesty's eagerness—is it perhaps because you wish to equip the army with long-range surveillance systems as soon as possible?"

"A clairvoyant view is certainly necessary, but you have a bigger plan in mind."

Liu Bang sat up abruptly, put his legs on the table, and looked every bit the rogue.

He pointed to the glass cup on the table, a tribute from the Western Regions. It wasn't particularly exquisite, but it was priceless.

"That glass was sold for more than gold by merchants from the Western Regions, but it turns out it was just made by burning sand."

"Now that we can make glass, why don't we set up a government-run operation and sell it exclusively to royalty and nobility?"

"All the profits will go into the national treasury, and the provisions and expenses for fighting the Xiongnu will all come from this."

By the end, Liu Bang's eyes were shining, and he was full of energy.

Zhang Liang was stunned for a long time after hearing this.

Exchanging sand for real gold and silver to fill the national treasury is truly cunning and ruthless.

"Your Majesty's vision is truly remarkable and your wisdom is profound," Zhang Liang exclaimed sincerely, bowing deeply to the ground.

Liu Bang's face fell.

"What do you mean by that? So, in your eyes, Zhang Zifang, Naigong is usually quite stupid?"

"Your subject dares not."

That's clearly what you think!

Meanwhile, during the Zhenguan era, Li Shimin's progress was surprisingly rapid.

As early as when the curtain was raised, he had all the craftsmen from the Imperial Workshop present.

Less than half an hour after the curtain fell, the first batch of raw materials had been crushed, mixed, and sent to the official kiln.

Meanwhile, in Yingtian Prefecture of the Ming Dynasty, Zhu Yuanzhang was fiddling with a wooden cylinder, with a thin piece of ice embedded at each end.

Zhu Yuanzhang held the wooden tube to his right eye, aiming it at the Fengtian Gate in the distance outside the palace.

"Whoa!"

Old Zhu exclaimed in amazement, for through the ice shards, he could clearly see the patterns on the door.

He was having a great time when Empress Ma walked in and saw Old Zhu with a wooden stick pressed against his face. She thought he had fallen ill.

"Zhongba, what are you doing?"

Zhu Yuanzhang moved the wooden tube aside and beckoned mysteriously, "Hey girl, come here quickly, I'll show you a treasure!"

Empress Ma took it with some doubt, and, imitating Zhu Yuanzhang, held it up to her eyes.

Looking towards the outside of the hall—

"Oh dear, the people on the city wall can see everything clearly!"

Empress Ma put down the wooden tube, then raised it again, before looking at Zhu Yuanzhang with a face full of shock.

"You managed to put together that telescope in the sky so quickly?"

Zhu Yuanzhang said with a smug look on his face, "We haven't even made glass yet, but the palace has plenty of ice."

"We figured that transparent glass and ice were pretty much the same, so we had the imperial kitchen grind two pieces and stuff them into this wooden tube."

Empress Ma opened her mouth in surprise, looking Zhu Yuanzhang up and down as if she didn't recognize him.

For the first time, she realized that Zhu Yuanzhang was actually so intelligent.

The sky only revealed the effect of the telescope, but he actually used ice blocks to pave the way.

"Zhongba, when did your brain become so sharp?"

Zhu Yuanzhang pursed his lips, looking somewhat aggrieved: "I'm not stupid, am I?"

"Tianmu said we're not good at writing, so we've been holding back our temper these past two days and studying every day."

"Yes, yes, our Emperor is the most refined and the most intelligent."

Empress Ma laughed, sensing that Zhu Yuanzhang had indeed become less irritable in recent days.

Just as the couple were bickering, an announcement was made outside the palace gates.

Zhu Biao strode in, his face beaming with barely concealed excitement.

"Father, I have a little trinket for you to see."

Zhu Yuanzhang tucked the telescope into his sleeve, pretending to be unaware of the situation.

In fact, the Embroidered Uniform Guard had already reported it, but the father had to keep a respectable facade.

"What is it? Let me see it."

Zhu Biao presented the iron kettle with both hands and placed it in the center of the imperial desk.

Zhu Yuanzhang originally only wanted to cooperate with his son's act, but he was still greatly surprised when he saw the craftsmanship of the kettle.

The spout is round and smooth, without any burrs.

He tried twisting it with his hand, and the lid opened smoothly, revealing neat patterns inside.

"Threaded?"

Zhu Yuanzhang stared wide-eyed and held the lid of the pot up to his eyes to examine it closely.

It's only been two or three days, how did Zhu Biao manage to create the threads?!