In fact, Zhao Hao was not too worried about the secret being leaked.

After all, cement is not coal. It is useless to just know the formula. The key to its production lies in the exact firing temperature and the correct ratio of raw materials.

If these two things are not done well, the quality of the cement produced will be very poor and may even cause the building to collapse.

It was not until the middle of the 19th century that people summed up these two valuable experiences and figured out the most suitable temperature and the most suitable ratio of raw materials.

The latter is easy to deal with, but the former, in the era when there were no infrared thermometers, would just tell you what the appropriate temperature was, but you still had no idea.

So how do we determine the temperature in this era? Zhao Hao's answer is to look at the firelight.

The flame glowed at 500 degrees at the beginning, then crimson at 600 degrees, scarlet at 700 degrees, cherry red at 800 degrees, cherry red at 1,000 degrees...

When the fire was white hot and people couldn't bear to look directly at it, it reached 1,400 degrees!

Apart from him, only Hua Bozheng and a few key technical personnel knew what color the fire in the furnace should be maintained, which made it difficult for others to steal the secret.

Well, actually the fire has to be white hot, which is 1,400 degrees. So using wood is totally not an option.

Fortunately, there is coal in Xishan, but the quality of the coal is not good. It barely burns red. If it is crushed into coal powder, it can only burn cherry red.

When Zhao Hao stayed in Xishan for so long, he spent most of his time trying to raise the furnace temperature.

Later, they listened to Hua Bozheng's advice, adopted the structure of the Wuxi brick kiln, built a high kiln with automatic air suction, and with the help of several bellows working continuously, they finally reached the furnace temperature.

By the way, even Hua Bozhen didn’t know that firebricks were needed to build Gaoyao, because the bricks fired on the island were made of kaolin, which is unique to Xishan, and the fired bricks are firebricks.

Bricks made from ordinary clay elsewhere simply cannot withstand the high temperatures in the kiln...

There’s nothing we can do, because Cement Island... Oh no, Xishan Island is so intimate and has everything.

Moreover, Xishan Island is an island in a lake, which makes it easier to keep it secret.

~~

After visiting the cement yard, Mr. Zhao's hair had turned white.

He took off the sunglasses on his nose and took out a handkerchief to wipe off the dust on his head. In order to avoid turning into a panda, Zhao Hao resolutely rejected Hua Bozhen's arrangement and would not go to the Jiangnan Coal Yard for inspection today.

When they returned, it was still the same old Gunner Camp. The original camp headquarters had been completely transformed into the place where Young Master Zhao lived when he came to the island, and it had changed a lot.

The original dilapidated wooden house was completely demolished and rebuilt into a brand new brick house. The outside was painted white, the walls were covered with black tiles, the yard was covered with cement, the wellhead was sealed, and a water pump was installed.

Oh yes, it’s called Drain King.

Qiaoqiao and Secretary Ma had lived on the island before and knew how dirty the cement yard was. They wisely did not follow him and came directly to clean up their accommodation, boil water and wait for Zhao Hao to come back.

Seeing that he really walked into the yard covered in dust and dirt, the two girls made fun of him while helping him wash his hair and take a bath.

By the time Master Zhao had finished washing up, it was already dark.

Zhao Hao asked someone to call Xu Yuanchun and Xiao Zhi to have dinner.

He originally planned to ask what Xu Yuanchun and Xu Kun talked about, but thinking that it would affect his appetite, he wisely did not open his mouth.

I thought to myself that this guy would definitely ask me for help, so I could just talk to him then.

After dinner, when Zhao Hao was about to see the guests off, Xu Yuanchun suddenly knelt on the ground.

Master Zhao thought to himself, here he comes, although late but he has arrived.

"Teacher, please accept me as your disciple!" Unexpectedly, this guy didn't mention his second uncle at all, but talked about becoming your apprentice.

"Uh..." Young Master Zhao felt a little overwhelmed, wondering why these young people don't play by the rules?

He helplessly asked the persistent Xu Yuanchun: "What do you want to learn? You are so persistent."

"Teacher, I want to learn this." Xu Yuanchun took out the physics book from his sleeve, turned to the middle page, and handed it to Zhao Hao with both hands.

Mr. Zhao took it and looked at it under the light. He saw that the title of this page was "Strange Disk". This was a small experiment he gave to explain "how people see things".

It uses the principle of "visual persistence" to draw the decomposed movements of the characters on a disc, and then use a disc with a window to cover the front one. In this way, by rotating the disc behind, you can see the characters moving through the window of the front disc.

"You want to learn... animation?" Young Master Zhao looked at Xu Yuanchun in surprise. He didn't expect that his popular science booklet could actually help the grandson of the former prime minister awaken his extraordinary otaku attributes.

He can be said to be the first otaku on earth.

"Animation... yes, it's a picture that moves!" Xu Yuanchun nodded excitedly, took out a book from his sleeve, handed it to Zhao Hao with both hands and said, "Teacher, please have a look. This is the first 'animation book' that I made according to your teachings!"

"Oh, a cartoon book?" Zhao Hao took it and flipped through a few pages. Seeing that the pictures on each page were coherent, he held all the pages in his right hand and then released his fingers little by little.

Amid the rustling sound of pages turning, the characters in the book began to move.

The painting actually showed him in Yuyuantan, riding a hot air balloon into the sky.

From the moment the hot air balloon takes off to the moment it flies away, it is so lifelike, as if it happened again yesterday.

But it was not just a reproduction, because after the hot air balloon took off, flying celestial beings and a phoenix appeared flying with it. It was obvious that Xu Yuanchun had made some artistic processing on it.

Zhao Hao finished reading it quickly and couldn't help but praise it: "This is mourning."

Xu Yuanchun was immediately overjoyed, and took out a round copper box from his book bag and continued to present treasures.

After opening it, he found the strange disk he made inside, but it was different from what Zhao Hao had introduced.

He put a circle of cardboard vertically on a rotating disc, drew pictures on the inside of the cardboard, and made thin vertical holes on the cardboard.

Zhao Hao turned the disc, and because of the "visual residue", the vertical holes seemed motionless. Through the vertical holes, he could see a girl in red skiing in the snow, but he didn't know who the prototype was.

This is much more three-dimensional and vivid than the flat ghost disk, it really feels like watching a cartoon.

"Niu Boyi!" Young Master Zhao raised two thumbs up.

"There's more!" Hearing Zhao Hao's praise, Xu Yuanchun's morale was boosted, and he continued to take out a round glass plate from the copper box.

As mentioned before, Western glass had long been introduced to the Ming Dynasty, and the royal family of the Ming Dynasty was also able to produce glass, but there was one problem: it was too expensive... But he was the grandson of Xu Huating.

Zhao Hao saw that he drew the storyboard on the glass this time, and also covered most of it with cardboard, leaving only one blank space.

There is a round hole in the center of the glass disc, and a wooden stick is inserted through it as an axis.

Then Xu Yuanchun stood it up, brought it in front of the candle, and asked Xiaozhi to help him turn the glass plate. A slightly blurry horse was projected on the white wall opposite, but its running movements were very smooth!

"Fuck, a Guipan projector!" Young Master Zhao shouted excitedly, "You are such a genius!"

Xu Weizhi was also very excited. He gritted his teeth, lifted his robe, and knelt down with Xu Yuanchun and said:

"Teacher, please accept me as a disciple. I want to learn animation too!"

ps. The fourth update, no more tonight...